Atle Rudshaug
2006-Jul-11 10:10 UTC
[Xen-users] Which is the best scheduler for database use?
I have seen that Xen has 3 schedulers: bvt, sedf and credit. What is the difference between theese? In my project I am running multiple VM''s, each running an instance of an Oracle database. Would any of the schedulers give better performance in this scenario? What is the best way to benchmark this? - Atle _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Henning Sprang
2006-Jul-12 10:11 UTC
Re: [Xen-users] Which is the best scheduler for database use?
On 7/11/06, Atle Rudshaug <atle.rudshaug@gmail.com> wrote:> > I have seen that Xen has 3 schedulers: bvt, sedf and credit. What is the > difference between theese?AFAIK you can find a description of these in the wiki and on some mails on this list or the developers list - search the archives.> In my project I am running multiple VM''s, each > running an instance of an Oracle database. Would any of the schedulers give > better performance in this scenario? What is the best way to benchmark this?No Idea, I guess big apps like Oracle can have quite special requirements. Benchmarking is also a topic I heard some times here, so the archives might help. Apart from that, "standard" Oracle benachmarks shoudl help, also. Henning _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Hello ,
I have setup 2 Xen systems on the same subnet and was
attempting a regular migration.The domU image which I
am migrating is based on the disk itself (file backed
VBD).
When i do an xm migrate ,it simply seems to hang (or
rather no activity is seen).
So some questions:
What time does it normally take for migration?
Are there any pre-migration steps that I have missed?
Attached below is the log(xend.log) snapshot.
Any help will be appreciated
Thanks,
Dakshina
[2006-07-12 19:34:42 xend.XendDomainInfo] ERROR
(XendDomainInfo:160)
Domain construction failed
Traceback (most recent call last):
File
"/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 154, in create
vm.initDomain()
File
"/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 1060, in initDomain
self.createDevices()
File
"/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 1173, in createDevices
self.createDevice(n, c)
File
"/usr/lib/python2.4/site-packages/xen/xend/XendDomainInfo.py",
line 848, in createDevice
return
self.getDeviceController(deviceClass).createDevice(devconfig)
File
"/usr/lib/python2.4/site-packages/xen/xend/server/DevController.py",
line 66, in createDevice
raise VmError( ("Device %s (%s) could not be
connected. "
VmError: Device 769 (vbd) could not be connected.
Hotplug scripts not working
[2006-07-12 19:34:42 xend.XendDomainInfo] DEBUG
(XendDomainInfo:1107) XendDomainInfo.destroy: domid=12
[2006-07-12 19:34:42 xend.XendDomainInfo] DEBUG
(XendDomainInfo:1115) XendDomainInfo.destroyDomain(12)
[2006-07-12 19:34:42 xend.XendDomainInfo] ERROR
(XendDomainInfo:1257) Failed to restart domain 11.
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Hi,> I have setup 2 Xen systems on the same subnet and was > attempting a regular migration.The domU image which I > am migrating is based on the disk itself (file backed > VBD).I don''t know you mean with a "file backed VBD", but one essential for migrating is that the image is on a filesystem that is reachable from both systems, the other is that both systems should base mostly on the same processor-family. > What time does it normally take for migration? Some seconds? > Are there any pre-migration steps that I have missed? In the xen-config you must allow the migration, but thats all. -- Chau y hasta luego, Thorolf _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
Have a look at this how-to, it may give you some hints. It is not totally on topic as it uses iSCSI, but you might find something useful in ther. **http://www.performancemagic.com/iscsi-xen-howto/ On 7/15/06, Thorolf Godawa <nospam@godawa.de> wrote:> > Hi, > > > I have setup 2 Xen systems on the same subnet and was > > attempting a regular migration.The domU image which I > > am migrating is based on the disk itself (file backed > > VBD). > I don''t know you mean with a "file backed VBD", but one essential for > migrating is that the image is on a filesystem that is reachable from > both systems, the other is that both systems should base mostly on the > same processor-family. > > > What time does it normally take for migration? > Some seconds? > > Are there any pre-migration steps that I have missed? > In the xen-config you must allow the migration, but thats all. > -- > > Chau y hasta luego, > > Thorolf > > _______________________________________________ > 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