Hi sorry for bad eng and picture :). Can such a decision? 3 servers openfiler give their drives 2 - 1 tb ISCSI server to OpenSolaris On OpenSolaris assembled a RAID-Z with double parity. Server OpenSolaris provides NFS access to this array, and duplicated by means of Open HA CLuster -- This message posted from opensolaris.org -------------- next part -------------- A non-text attachment was scrubbed... Name: 1.jpg Type: image/jpeg Size: 53133 bytes Desc: not available URL: <http://mail.opensolaris.org/pipermail/zfs-discuss/attachments/20100320/838c22d2/attachment.jpg>
On Mar 20, 2010, at 10:18 AM, vikkr <psixvk at gmail.com> wrote:> Hi sorry for bad eng and picture :). > > Can such a decision? > > 3 servers openfiler give their drives 2 - 1 tb ISCSI server to > OpenSolaris > On OpenSolaris assembled a RAID-Z with double parity. > Server OpenSolaris provides NFS access to this array, and duplicated > by means of Open HA CLusterYes, you can. With three servers you want to to provide resiliency against the loss of any one server. I guess these are mirrors in each server? If so, you will get better performance and more useable capacity by exporting each drive individually over iSCSI and setting the 6 drives as a raidz2 or even raidz3 which will give 3-4 drives of capacity, raidz3 will provide resiliency of a drive failure during a server failure. -Ross
THX Ross, i plan exporting each drive individually over iSCSI. I this case, the write, as well as reading, will go to all 6 discs at once, right? The only question - how to calculate fault tolerance of such a system if the discs are all different in size? Maybe there is such a tool? or check? -- This message posted from opensolaris.org
On Mar 20, 2010, at 11:48 AM, vikkr <psixvk at gmail.com> wrote:> THX Ross, i plan exporting each drive individually over iSCSI. > I this case, the write, as well as reading, will go to all 6 discs > at once, right? > > The only question - how to calculate fault tolerance of such a > system if the discs are all different in size? > Maybe there is such a tool? or check?They should all be the same size. You can make them the same size on the iSCSI target. -Ross
Vikkr, You seem to be concerned about the availability? Open HA seems to be a package last updated in 2005 (version 0.3.6). (?) It seems to me like a real fun toy project to build but I would be pretty reserved about the actual availability and putting using these kind of setup for production purposes and actually expecting some kind of proper uptime. hth, ..Remco vikkr wrote:> THX Ross, i plan exporting each drive individually over iSCSI. > I this case, the write, as well as reading, will go to all 6 discs at once, right? > > The only question - how to calculate fault tolerance of such a system if the discs are all different in size? > Maybe there is such a tool? or check? >
On Mar 20, 2010, at 14:37, Remco Lengers wrote:> You seem to be concerned about the availability? Open HA seems to be > a package last updated in 2005 (version 0.3.6). (?) It seems to me > like a real fun toy project to build but I would be pretty reserved > about the actual availability and putting using these kind of setup > for production purposes and actually expecting some kind of proper > uptime.There are more recent versions available:> In conjunction with the release of OpenSolaris 2009.06, Sun delivers > Open HA Cluster 2009.06 ....http://www.opensolaris.com/learn/features/availability/ http://hub.opensolaris.org/bin/view/Community+Group+ha-clusters/ More info at: http://mail.opensolaris.org/mailman/listinfo/ha-clusters-discuss There''s also Solaris Cluster, which is free-as-beer: http://www.sun.com/software/solaris/cluster/ Support costs.
David, Thanks for the pointers! That version looks more mature from the listed functionality "Fencing, and Quorum etc." Would be interested to know how it performs in real life. ..Remco David Magda wrote:> On Mar 20, 2010, at 14:37, Remco Lengers wrote: > >> You seem to be concerned about the availability? Open HA seems to be >> a package last updated in 2005 (version 0.3.6). (?) It seems to me >> like a real fun toy project to build but I would be pretty reserved >> about the actual availability and putting using these kind of setup >> for production purposes and actually expecting some kind of proper >> uptime. > > There are more recent versions available: > >> In conjunction with the release of OpenSolaris 2009.06, Sun delivers >> Open HA Cluster 2009.06 .... > > http://www.opensolaris.com/learn/features/availability/ > http://hub.opensolaris.org/bin/view/Community+Group+ha-clusters/ > > More info at: > > http://mail.opensolaris.org/mailman/listinfo/ha-clusters-discuss > > There''s also Solaris Cluster, which is free-as-beer: > > http://www.sun.com/software/solaris/cluster/ > > Support costs.