....hm, anyone?
On 2010年4月23日 at 12:06, Christian Kujau wrote:
> Hi,
>
> I'm using xen-3.2 (from Ubuntu 8.04) and have some trouble with i/o 
> barriers. During boot (a paravirt DomU with a more current kernel), 
> blkfront reports:
>
> blkfront: xvda: barriers enabled
> blkfront: xvdb: barriers enabled
> blkfront: xvdc: barriers enabled
> blkfront: xvdd: barriers enabled
> blkfront: xvde: barriers enabled
> blkfront: xvdf: barriers enabled
>
> But as soon as I mount e.g. btrfs or ext4 with barriers support and write 
> to the filesystem, I see:
>
> [386046.164004] blkfront: xvdb: write barrier op failed
> [386046.164017] blkfront: xvdb: barriers disabled
> [386046.164023] end_request: I/O error, dev xvdb, sector 2100400
> [386046.164031] end_request: I/O error, dev xvdb, sector 2100400
> [386046.164050] JBD2: wait_on_commit_record: sync failed on xvdb-8 - 
> disabling barriers
>
> So, is xen-3.2 perhaps not able to handle barriers? Are later versions 
> able to handle barriers? (I could not find anything about barriers in the 
> wiki)
>
> One more word on the setup: the devices for the domU are LVM2 volumes in 
> the Dom0, but I thought LVM could handle barriers, right?
>
> For the record, dmesg and .config for both domU and dom0 are on:
>
> http://nerdbynature.de/bits/2.6.24-24-xen/ 
>
> Thanks,
> Christian.
> -- 
> BOFH excuse #246:
>
> It must have been the lightning storm we had (yesterday) (last week) (last 
> month)
>
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>
>
-- 
BOFH excuse #220:
Someone thought The Big Red Button was a light switch.
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