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| 01:58 Swat- | Yo, anyone awake? |
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| 11:44 Swat- | Can anyone tell me which disk/scsi parameters are changes when installing via FAI? It seems like the disk performance is poor, opposed to a 'normal' virt-install instance. |
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| 11:47 oz_ | Swat-: during or after install? |
| 11:49 Swat- | The only time i test write/read performance is after the install, so after :) |
| 11:51 Swat- | I even copied the kvm xml config which was created using virt-install (where the write performance is good). So i am fairly sure its not KVM or the way KVM attached the disk. |
| 11:59 mgoetze | Swat-: are you using the same kernel during and after installation? |
| 12:01 mgoetze | oh wait... i misread yesterday... you are using fai instead of virt-install? |
| 12:01 mgoetze | i would have thought one would use fai with virt-install... not that i ever got it to work... |
| 12:01 Swat- | Yes, i have 1 vm installed with virt-install (which had good disk wrote performance) |
| 12:02 Swat- | The other vm is installed via FAI and gives me poor write performance. |
| 12:02 Swat- | Kernel version on both: Linux debian 2.6.32-5-amd64 |
| 12:02 Swat- | Tried playing with disk schedules, but that makes not a big difference. |
| 12:03 mgoetze | so what do you mean by "installed with virt-install"? |
| 12:03 mgoetze | are you attaching an iso image of the debian installer, or what? |
| 12:03 Swat- | virt-install -n bla -r 1024 etc.. <-- virt-install way. |
| 12:04 Swat- | FAI uses pxeboot with nfs source |
| 12:04 mgoetze | does that include --pxe? |
| 12:04 Swat- | virt-install does not include --pxe; it includes --location http://ftp.tiscali.nl/pub/mirror/debian/.. |
| 12:05 mgoetze | aha, so, why don't you try it with --pxe? |
| 12:06 Swat- | well i could, but then i would have 2 boxes with disk write performance issues. |
| 12:07 mgoetze | ok so you're convinced that the problem actually has nothing to do with virt-install, but rather with debian-installer vs. fai, is that right? |
| 12:07 Swat- | Yes, and since virt-install --location is the same source as my fai mirror was setup, i assume its somewhere in the fai config files. |
| 12:10 mgoetze | well, you'll have to check your installed images for differences, i'm afraid i don't know very well what kind of stuff debian-installer does... |
| 12:10 Swat- | Ye ok.. i will try to see if i can find some diffs |
| 12:12 Swat- | Well thanks so far, when i find the issue i'll be sure to drop a note here :) |
| 12:39 FBI | fai: 3 lange committed revision 6203 to 7 fai: apply patch from experimental, install grub into all raid devices |
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| --- Mon Nov 29 2010 |