Martinx - ジェームズ
2010-Mar-23 20:47 UTC
[Xen-users] XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
Hi! I thinking why the XCP/XenServer has an option to use the VHD format only for the NFS Servers... How to use the VHD on top of a local or shared LVM? I mean, I want to create a logical volume of 500G and within this volume, I''ll create the VHDs files instead LVs for each domU. And I''ll use this setup on top of my FC IBM DS4700 shared storage... It is possible?! I want the good of both worlds, the space efficient feature of the VHDs (not pre-allocating) with the speed of the local or fiber channel storage. Thanks! Thiago _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Dave Scott
2010-Mar-24 21:54 UTC
RE: [Xen-users] XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
Hi, XCP does use VHD format on top of the LVs it creates on iSCSI/FC storage. The current problem is that it doesn''t support "thin provisioning" (i.e. not pre-allocating). It''s great for making snapshots and clones but not so good for space usage... as you observed! There is an early prototype of an XCP/vhd storage daemon which has an LVM implementation optimized for being able to quickly resize volumes. When that stabilizes, we''ll be able to have thin provisioning. We should put the development repo for the prototype on xenbits somewhere. Cheers, Dave From: xen-users-bounces@lists.xensource.com [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Martinx - ????? Sent: 23 March 2010 20:47 To: Xen List Subject: [Xen-users] XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS. Hi! I thinking why the XCP/XenServer has an option to use the VHD format only for the NFS Servers... How to use the VHD on top of a local or shared LVM? I mean, I want to create a logical volume of 500G and within this volume, I''ll create the VHDs files instead LVs for each domU. And I''ll use this setup on top of my FC IBM DS4700 shared storage... It is possible?! I want the good of both worlds, the space efficient feature of the VHDs (not pre-allocating) with the speed of the local or fiber channel storage. Thanks! Thiago _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Martinx - ジェームズ
2010-Mar-25 20:15 UTC
Re: [Xen-users] XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
Hi! On 24 March 2010 18:54, Dave Scott <Dave.Scott@eu.citrix.com> wrote:> Hi, > > > > XCP does use VHD format on top of the LVs it creates on iSCSI/FC storage. > The current problem is that it doesn’t support “thin provisioning” (i.e. not > pre-allocating). It’s great for making snapshots and clones but not so good > for space usage… as you observed! >Completely understood...> > > There is an early prototype of an XCP/vhd storage daemon which has an LVM > implementation optimized for being able to quickly resize volumes. When that > stabilizes, we’ll be able to have thin provisioning. We should put the > development repo for the prototype on xenbits somewhere. >Mmm... You mean this thin provisioning is, in fact, a grow of the logical volume when it becomes, for example, 95% full? I''m thinking in a more simple way to do it, looking at the way the XCP does the mount of the NFS Server and makes its shared repository there, I think: Why they just don''t mount a big (1T) local logical volume and make the necessary files (storage repo and the VHDs) on the locally mounted file system, instead of the remote NFS? Also, we can use the SDFS instead of the ext3 for the logical volume file system, so we can save more disc space! I''ll try this SDFS this week, to export it through NFS to a XCP node and sees how fast and secure it is... Look: http://www.opendedup.org Cheers,> > Dave >Cheers! Thiago> > > *From:* xen-users-bounces@lists.xensource.com [mailto: > xen-users-bounces@lists.xensource.com] *On Behalf Of *Martinx - ????? > *Sent:* 23 March 2010 20:47 > *To:* Xen List > *Subject:* [Xen-users] XCP storage repository using VHD on top of the LVM > (FC shared too) instead of the NFS. > > > > Hi! > > I thinking why the XCP/XenServer has an option to use the VHD format only > for the NFS Servers... How to use the VHD on top of a local or shared LVM? > > I mean, I want to create a logical volume of 500G and within this volume, > I''ll create the VHDs files instead LVs for each domU. > > And I''ll use this setup on top of my FC IBM DS4700 shared storage... > > It is possible?! I want the good of both worlds, the space efficient > feature of the VHDs (not pre-allocating) with the speed of the local or > fiber channel storage. > > Thanks! > Thiago >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Vern Burke
2010-Mar-25 20:31 UTC
Re: [Xen-users] XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
"Why they just don''t mount a big (1T) local logical volume and > make the necessary files (storage repo and the VHDs) on the locally > mounted file system, instead of the remote NFS?" Because for the cloud to work and allow migration of virtual machines between cloud hosts, all hosts have to be able to access the same storage. You can put the storage on a local drive, you''ll just restrict that VM to running on that host only. Kind of wrecks the idea of the cloud. Vern Burke SwiftWater Telecom http://www.swiftwatertel.com ISP/CLEC Engineering Services Data Center Services Remote Backup Services On 3/25/2010 4:15 PM, Martinx - ジェームズ wrote:> Hi! > > On 24 March 2010 18:54, Dave Scott <Dave.Scott@eu.citrix.com > <mailto:Dave.Scott@eu.citrix.com>> wrote: > > Hi, > > XCP does use VHD format on top of the LVs it creates on iSCSI/FC > storage. The current problem is that it doesn’t support “thin > provisioning” (i.e. not pre-allocating). It’s great for making > snapshots and clones but not so good for space usage… as you observed! > > Completely understood... > > There is an early prototype of an XCP/vhd storage daemon which has > an LVM implementation optimized for being able to quickly resize > volumes. When that stabilizes, we’ll be able to have thin > provisioning. We should put the development repo for the prototype > on xenbits somewhere. > > Mmm... You mean this thin provisioning is, in fact, a grow of the > logical volume when it becomes, for example, 95% full? > > I''m thinking in a more simple way to do it, looking at the way the XCP > does the mount of the NFS Server and makes its shared repository there, > I think: Why they just don''t mount a big (1T) local logical volume and > make the necessary files (storage repo and the VHDs) on the locally > mounted file system, instead of the remote NFS? > > Also, we can use the SDFS instead of the ext3 for the logical volume > file system, so we can save more disc space! > > I''ll try this SDFS this week, to export it through NFS to a XCP node and > sees how fast and secure it is... > > Look: http://www.opendedup.org > > Cheers, > > Dave > > Cheers! > Thiago > > *From:* xen-users-bounces@lists.xensource.com > <mailto:xen-users-bounces@lists.xensource.com> > [mailto:xen-users-bounces@lists.xensource.com > <mailto:xen-users-bounces@lists.xensource.com>] *On Behalf Of > *Martinx - ????? > *Sent:* 23 March 2010 20:47 > *To:* Xen List > *Subject:* [Xen-users] XCP storage repository using VHD on top of > the LVM (FC shared too) instead of the NFS. > > Hi! > > I thinking why the XCP/XenServer has an option to use the VHD > format only for the NFS Servers... How to use the VHD on top of a > local or shared LVM? > > I mean, I want to create a logical volume of 500G and within this > volume, I''ll create the VHDs files instead LVs for each domU. > > And I''ll use this setup on top of my FC IBM DS4700 shared storage... > > It is possible?! I want the good of both worlds, the space > efficient feature of the VHDs (not pre-allocating) with the speed of > the local or fiber channel storage. > > Thanks! > Thiago > > > > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Martinx - ジェームズ
2010-Mar-25 21:18 UTC
Re: [Xen-users] XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
Hi Burke! On 25 March 2010 17:31, Vern Burke <vburke@skow.net> wrote:> "Why they just don''t mount a big (1T) local logical volume and > > make the necessary files (storage repo and the VHDs) on the locally > > mounted file system, instead of the remote NFS?" > > Because for the cloud to work and allow migration of virtual machines > between cloud hosts, all hosts have to be able to access the same storage. > You can put the storage on a local drive, you''ll just restrict that VM to > running on that host only. > > Kind of wrecks the idea of the cloud. >Well, I''m gonna change the subject a bit... Lets talk about the thin provisioning outside the scope of the NFS Server... if you have a fiber channel shared storage LUN exported to two or more XCPs, or even some kind of Cluster LVM, you can use the OCFS2 instead of the ext3, to host the VHD files and being able to do the live motion, etc... So, the same "engine" will manage the VHDs hosted at the NFS server, locally mounted logical volumes with ext3 or SDFS and the FC or CLVM with OCFS2 on top of it...> > Vern Burke > > SwiftWater Telecom > http://www.swiftwatertel.com > ISP/CLEC Engineering Services > Data Center Services > Remote Backup Services >- Thiago> > > On 3/25/2010 4:15 PM, Martinx - ジェА璽爛 wrote: > >> Hi! >> >> On 24 March 2010 18:54, Dave Scott <Dave.Scott@eu.citrix.com >> <mailto:Dave.Scott@eu.citrix.com>> wrote: >> >> Hi, >> >> XCP does use VHD format on top of the LVs it creates on iSCSI/FC >> storage. The current problem is that it doesn’t support “thin >> provisioning” (i.e. not pre-allocating). It’s great for making >> snapshots and clones but not so good for space usage… as you observed! >> >> Completely understood... >> >> There is an early prototype of an XCP/vhd storage daemon which has >> an LVM implementation optimized for being able to quickly resize >> volumes. When that stabilizes, we’ll be able to have thin >> provisioning. We should put the development repo for the prototype >> on xenbits somewhere. >> >> Mmm... You mean this thin provisioning is, in fact, a grow of the >> logical volume when it becomes, for example, 95% full? >> >> I''m thinking in a more simple way to do it, looking at the way the XCP >> does the mount of the NFS Server and makes its shared repository there, >> I think: Why they just don''t mount a big (1T) local logical volume and >> make the necessary files (storage repo and the VHDs) on the locally >> mounted file system, instead of the remote NFS? >> >> Also, we can use the SDFS instead of the ext3 for the logical volume >> file system, so we can save more disc space! >> >> I''ll try this SDFS this week, to export it through NFS to a XCP node and >> sees how fast and secure it is... >> >> Look: http://www.opendedup.org >> >> Cheers, >> >> Dave >> >> Cheers! >> Thiago >> >> *From:* xen-users-bounces@lists.xensource.com >> <mailto:xen-users-bounces@lists.xensource.com> >> [mailto:xen-users-bounces@lists.xensource.com >> <mailto:xen-users-bounces@lists.xensource.com>] *On Behalf Of >> *Martinx - ????? >> *Sent:* 23 March 2010 20:47 >> *To:* Xen List >> *Subject:* [Xen-users] XCP storage repository using VHD on top of >> the LVM (FC shared too) instead of the NFS. >> >> Hi! >> >> I thinking why the XCP/XenServer has an option to use the VHD >> format only for the NFS Servers... How to use the VHD on top of a >> local or shared LVM? >> >> I mean, I want to create a logical volume of 500G and within this >> volume, I''ll create the VHDs files instead LVs for each domU. >> >> And I''ll use this setup on top of my FC IBM DS4700 shared storage... >> >> It is possible?! I want the good of both worlds, the space >> efficient feature of the VHDs (not pre-allocating) with the speed of >> the local or fiber channel storage. >> >> Thanks! >> Thiago >> >> >> >> >> _______________________________________________ >> Xen-users mailing list >> Xen-users@lists.xensource.com >> http://lists.xensource.com/xen-users >> > > _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users >_______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Pasi Kärkkäinen
2012-Nov-30 10:05 UTC
Re: XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
On Wed, Mar 24, 2010 at 09:54:01PM +0000, Dave Scott wrote:> Hi, >Hello Dave,> XCP does use VHD format on top of the LVs it creates on iSCSI/FC storage. > The current problem is that it doesn''t support "thin provisioning" (i.e. > not pre-allocating). It''s great for making snapshots and clones but not so > good for space usage... as you observed! > > There is an early prototype of an XCP/vhd storage daemon which has an LVM > implementation optimized for being able to quickly resize volumes. When > that stabilizes, we''ll be able to have thin provisioning. We should put > the development repo for the prototype on xenbits somewhere. >Any progress on supporting thinprov on block-storage ? Thanks, -- Pasi> > Cheers, > > Dave > > > > From: xen-users-bounces@lists.xensource.com > [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Martinx - > ????? > Sent: 23 March 2010 20:47 > To: Xen List > Subject: [Xen-users] XCP storage repository using VHD on top of the LVM > (FC shared too) instead of the NFS. > > > > Hi! > > I thinking why the XCP/XenServer has an option to use the VHD format only > for the NFS Servers... How to use the VHD on top of a local or shared LVM? > > I mean, I want to create a logical volume of 500G and within this volume, > I''ll create the VHDs files instead LVs for each domU. > > And I''ll use this setup on top of my FC IBM DS4700 shared storage... > > It is possible?! I want the good of both worlds, the space efficient > feature of the VHDs (not pre-allocating) with the speed of the local or > fiber channel storage. > > Thanks! > Thiago> _______________________________________________ > Xen-users mailing list > Xen-users@lists.xensource.com > http://lists.xensource.com/xen-users
Pasi Kärkkäinen
2012-Dec-07 12:49 UTC
Re: XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
On Fri, Nov 30, 2012 at 10:14:52AM +0000, Dave Scott wrote:> Hey Pasi, > > On Nov 30, 2012, at 10:05 AM, "Pasi Kärkkäinen" <pasik@iki.fi> wrote: > > > On Wed, Mar 24, 2010 at 09:54:01PM +0000, Dave Scott wrote: > >> Hi, > > > > Hello Dave, > > > >> XCP does use VHD format on top of the LVs it creates on iSCSI/FC storage. > >> The current problem is that it doesn''t support "thin provisioning" (i.e. > >> not pre-allocating). It''s great for making snapshots and clones but not so > >> good for space usage... as you observed! > >> > >> There is an early prototype of an XCP/vhd storage daemon which has an LVM > >> implementation optimized for being able to quickly resize volumes. When > >> that stabilizes, we''ll be able to have thin provisioning. We should put > >> the development repo for the prototype on xenbits somewhere. > > > > Any progress on supporting thinprov on block-storage ? > > I''ve cc:d Keith, who is more of a storage expert than me ;-) He works on the SM layer used in XCP and I''m sure will have some useful insights. >Thanks Dave! Keith: Any insights on this? -- Pasi> Cheers, > Dave > > > > > Thanks, > > > > -- Pasi > > > > > >> > >> Cheers, > >> > >> Dave > >> > >> > >> > >> From: xen-users-bounces@lists.xensource.com > >> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Martinx - > >> ????? > >> Sent: 23 March 2010 20:47 > >> To: Xen List > >> Subject: [Xen-users] XCP storage repository using VHD on top of the LVM > >> (FC shared too) instead of the NFS. > >> > >> > >> > >> Hi! > >> > >> I thinking why the XCP/XenServer has an option to use the VHD format only > >> for the NFS Servers... How to use the VHD on top of a local or shared LVM? > >> > >> I mean, I want to create a logical volume of 500G and within this volume, > >> I''ll create the VHDs files instead LVs for each domU. > >> > >> And I''ll use this setup on top of my FC IBM DS4700 shared storage... > >> > >> It is possible?! I want the good of both worlds, the space efficient > >> feature of the VHDs (not pre-allocating) with the speed of the local or > >> fiber channel storage. > >> > >> Thanks! > >> Thiago > > > >> _______________________________________________ > >> Xen-users mailing list > >> Xen-users@lists.xensource.com > >> http://lists.xensource.com/xen-users > >
Keith Petley
2012-Dec-07 17:34 UTC
Re: XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
Hi Pasi, The LVM daemonyou refer to is before my time at Citrix - from what I understand they found problems with it and it never progressed beyond the prototype stage. We are currently looking at thin provisioning (again) and are currently profiling the ocfs2 clustered file system to see if it provides suitable performanceas an lvm replacement. Regards Keith On 07/12/12 12:49, Pasi Kärkkäinen wrote:> On Fri, Nov 30, 2012 at 10:14:52AM +0000, Dave Scott wrote: >> Hey Pasi, >> >> On Nov 30, 2012, at 10:05 AM, "Pasi Kärkkäinen" <pasik@iki.fi> wrote: >> >>> On Wed, Mar 24, 2010 at 09:54:01PM +0000, Dave Scott wrote: >>>> Hi, >>> Hello Dave, >>> >>>> XCP does use VHD format on top of the LVs it creates on iSCSI/FC storage. >>>> The current problem is that it doesn''t support "thin provisioning" (i.e. >>>> not pre-allocating). It''s great for making snapshots and clones but not so >>>> good for space usage... as you observed! >>>> >>>> There is an early prototype of an XCP/vhd storage daemon which has an LVM >>>> implementation optimized for being able to quickly resize volumes. When >>>> that stabilizes, we''ll be able to have thin provisioning. We should put >>>> the development repo for the prototype on xenbits somewhere. >>> Any progress on supporting thinprov on block-storage ? >> I''ve cc:d Keith, who is more of a storage expert than me ;-) He works on the SM layer used in XCP and I''m sure will have some useful insights. >> > Thanks Dave! > > Keith: Any insights on this? > > > -- Pasi > >> Cheers, >> Dave >> >>> Thanks, >>> >>> -- Pasi >>> >>> >>>> Cheers, >>>> >>>> Dave >>>> >>>> >>>> >>>> From: xen-users-bounces@lists.xensource.com >>>> [mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Martinx - >>>> ????? >>>> Sent: 23 March 2010 20:47 >>>> To: Xen List >>>> Subject: [Xen-users] XCP storage repository using VHD on top of the LVM >>>> (FC shared too) instead of the NFS. >>>> >>>> >>>> >>>> Hi! >>>> >>>> I thinking why the XCP/XenServer has an option to use the VHD format only >>>> for the NFS Servers... How to use the VHD on top of a local or shared LVM? >>>> >>>> I mean, I want to create a logical volume of 500G and within this volume, >>>> I''ll create the VHDs files instead LVs for each domU. >>>> >>>> And I''ll use this setup on top of my FC IBM DS4700 shared storage... >>>> >>>> It is possible?! I want the good of both worlds, the space efficient >>>> feature of the VHDs (not pre-allocating) with the speed of the local or >>>> fiber channel storage. >>>> >>>> Thanks! >>>> Thiago >>>> _______________________________________________ >>>> Xen-users mailing list >>>> Xen-users@lists.xensource.com >>>> http://lists.xensource.com/xen-users-- Keith Petley Senior Storage Development Engineer Citrix Systems UK Ltd Building 101 | Cambridge Science Park | Milton Road | Cambridge | CB4 0FY | UK T: +44 (0)1223 435609 --------------060303070100000707010002 Content-Type: text/html; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit <html> <head> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#FFFFFF" text="#000000"> <font size="-1">Hi Pasi,<br> <br> <font size="-1">The LVM daemon<font size="-1"> you refer to i<font size="-1">s bef<font size="-1">ore <font size="-1">my time at Citrix - from what I understand they found problems wit<font size="-1">h it and it neve<font size="-1">r progressed beyond the prototype stage.<br> <br> <font size="-1">We are currently looking at thin provisioning (again) and are cur<font size="-1">rently profiling the ocfs2 clustered file <font size="-1">system to see if it pro<font size="-1">vides su<font size="-1">itable per<font size="-1">formance<font size="-1"><font size="-1"> as an lvm replacement.</font><br> <br> <font size="-1">Re<font size="-1">gards<br> <font size="-1"><font size="-1">Keith<br> <br> </font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font></font> <div class="moz-cite-prefix">On 07/12/12 12:49, Pasi Kärkkäinen wrote:<br> </div> <blockquote cite="mid:20121207124946.GZ8912@reaktio.net" type="cite"> <pre wrap="">On Fri, Nov 30, 2012 at 10:14:52AM +0000, Dave Scott wrote: </pre> <blockquote type="cite"> <pre wrap="">Hey Pasi, On Nov 30, 2012, at 10:05 AM, "Pasi Kärkkäinen" <a class="moz-txt-link-rfc2396E" href="mailto:pasik@iki.fi"><pasik@iki.fi></a> wrote: </pre> <blockquote type="cite"> <pre wrap="">On Wed, Mar 24, 2010 at 09:54:01PM +0000, Dave Scott wrote: </pre> <blockquote type="cite"> <pre wrap=""> Hi, </pre> </blockquote> <pre wrap=""> Hello Dave, </pre> <blockquote type="cite"> <pre wrap=""> XCP does use VHD format on top of the LVs it creates on iSCSI/FC storage. The current problem is that it doesn''t support "thin provisioning" (i.e. not pre-allocating). It''s great for making snapshots and clones but not so good for space usage... as you observed! There is an early prototype of an XCP/vhd storage daemon which has an LVM implementation optimized for being able to quickly resize volumes. When that stabilizes, we''ll be able to have thin provisioning. We should put the development repo for the prototype on xenbits somewhere. </pre> </blockquote> <pre wrap=""> Any progress on supporting thinprov on block-storage ? </pre> </blockquote> <pre wrap=""> I''ve cc:d Keith, who is more of a storage expert than me ;-) He works on the SM layer used in XCP and I''m sure will have some useful insights. </pre> </blockquote> <pre wrap=""> Thanks Dave! Keith: Any insights on this? -- Pasi </pre> <blockquote type="cite"> <pre wrap="">Cheers, Dave </pre> <blockquote type="cite"> <pre wrap=""> Thanks, -- Pasi </pre> <blockquote type="cite"> <pre wrap=""> Cheers, Dave From: <a class="moz-txt-link-abbreviated" href="mailto:xen-users-bounces@lists.xensource.com">xen-users-bounces@lists.xensource.com</a> [<a class="moz-txt-link-freetext" href="mailto:xen-users-bounces@lists.xensource.com">mailto:xen-users-bounces@lists.xensource.com</a>] On Behalf Of Martinx - ????? Sent: 23 March 2010 20:47 To: Xen List Subject: [Xen-users] XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS. Hi! I thinking why the XCP/XenServer has an option to use the VHD format only for the NFS Servers... How to use the VHD on top of a local or shared LVM? I mean, I want to create a logical volume of 500G and within this volume, I''ll create the VHDs files instead LVs for each domU. And I''ll use this setup on top of my FC IBM DS4700 shared storage... It is possible?! I want the good of both worlds, the space efficient feature of the VHDs (not pre-allocating) with the speed of the local or fiber channel storage. Thanks! Thiago </pre> </blockquote> <pre wrap=""> </pre> <blockquote type="cite"> <pre wrap="">_______________________________________________ Xen-users mailing list <a class="moz-txt-link-abbreviated" href="mailto:Xen-users@lists.xensource.com">Xen-users@lists.xensource.com</a> <a class="moz-txt-link-freetext" href="http://lists.xensource.com/xen-users">http://lists.xensource.com/xen-users</a> </pre> </blockquote> <pre wrap=""> </pre> </blockquote> </blockquote> </blockquote> <br> <pre class="moz-signature" cols="72">-- Keith Petley Senior Storage Development Engineer Citrix Systems UK Ltd Building 101 | Cambridge Science Park | Milton Road | Cambridge | CB4 0FY | UK T: +44 (0)1223 435609</pre> </body> </html> --------------060303070100000707010002-- --===============4234011038545991763=Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ Xen-users mailing list Xen-users@lists.xen.org http://lists.xen.org/xen-users --===============4234011038545991763==--
Pasi Kärkkäinen
2012-Dec-07 21:40 UTC
Re: XCP storage repository using VHD on top of the LVM (FC shared too) instead of the NFS.
On Fri, Dec 07, 2012 at 05:34:45PM +0000, Keith Petley wrote:> Hi Pasi, >Hello,> The LVM daemon you refer to is before my time at Citrix - from what I > understand they found problems with it and it never progressed beyond the > prototype stage. >That explains why it never saw daylight..> We are currently looking at thin provisioning (again) and are currently > profiling the ocfs2 clustered file system to see if it provides suitable > performance as an lvm replacement. >Ok. Linux DM/LVM also does thin provisioning these days.. Thanks for the reply! -- Pasi> Regards > Keith > > On 07/12/12 12:49, Pasi Kärkkäinen wrote: > > On Fri, Nov 30, 2012 at 10:14:52AM +0000, Dave Scott wrote: > > Hey Pasi, > > On Nov 30, 2012, at 10:05 AM, "Pasi Kärkkäinen" [1]<pasik@iki.fi> wrote: > > > On Wed, Mar 24, 2010 at 09:54:01PM +0000, Dave Scott wrote: > > Hi, > > Hello Dave, > > > XCP does use VHD format on top of the LVs it creates on iSCSI/FC storage. > The current problem is that it doesn''t support "thin provisioning" (i.e. > not pre-allocating). It''s great for making snapshots and clones but not so > good for space usage... as you observed! > > There is an early prototype of an XCP/vhd storage daemon which has an LVM > implementation optimized for being able to quickly resize volumes. When > that stabilizes, we''ll be able to have thin provisioning. We should put > the development repo for the prototype on xenbits somewhere. > > Any progress on supporting thinprov on block-storage ? > > I''ve cc:d Keith, who is more of a storage expert than me ;-) He works on the SM layer used in XCP and I''m sure will have some useful insights. > > > Thanks Dave! > > Keith: Any insights on this? > > > -- Pasi > > > Cheers, > Dave > > > Thanks, > > -- Pasi > > > > Cheers, > > Dave > > > > From: [2]xen-users-bounces@lists.xensource.com > [[3]mailto:xen-users-bounces@lists.xensource.com] On Behalf Of Martinx - > ????? > Sent: 23 March 2010 20:47 > To: Xen List > Subject: [Xen-users] XCP storage repository using VHD on top of the LVM > (FC shared too) instead of the NFS. > > > > Hi! > > I thinking why the XCP/XenServer has an option to use the VHD format only > for the NFS Servers... How to use the VHD on top of a local or shared LVM? > > I mean, I want to create a logical volume of 500G and within this volume, > I''ll create the VHDs files instead LVs for each domU. > > And I''ll use this setup on top of my FC IBM DS4700 shared storage... > > It is possible?! I want the good of both worlds, the space efficient > feature of the VHDs (not pre-allocating) with the speed of the local or > fiber channel storage. > > Thanks! > Thiago > > > _______________________________________________ > Xen-users mailing list > [4]Xen-users@lists.xensource.com > [5]http://lists.xensource.com/xen-users > > > -- > Keith Petley > Senior Storage Development Engineer > > Citrix Systems UK Ltd > > Building 101 | Cambridge Science Park | Milton Road | Cambridge | CB4 0FY | UK > > T: +44 (0)1223 435609 > > References > > Visible links > 1. mailto:pasik@iki.fi > 2. mailto:xen-users-bounces@lists.xensource.com > 3. mailto:xen-users-bounces@lists.xensource.com > 4. mailto:Xen-users@lists.xensource.com > 5. http://lists.xensource.com/xen-users