[sheepdog-users] object cache questions

[icez network]

For the auto-reconnect, I have seen that it just supported since qemu 1.7.0?


On Mon, Feb 3, 2014 at 6:58 PM, Maxim Terleckiy <terleckiy at emu.ru> wrote:

>  02.02.2014 13:53, Valerio Pachera пишет:
>
>
> 2014-02-01 Maxim Terletskiy <terletskiy at emu.ru>:
>
>> the reason before found that "nodiratime" is root of the evil.
>
> Hope this information would be usefull for somebody.
>>
>
> Sure it  is.
>  Has any body else been able to reproduce this problem?
>  What version of sheep are you running?
>
>    For me "nodiratime" problem arises with QEMU 1.6.1, 1.6.2, 1.7.0.
> Using CentOS 6.5 x86_64, sheep version 0.7.6 with zookeeper, object cache
> on ext4 partition, dual-nic with bonded ethernet for cluster communication
> and IPoIB for IO. Sheep options I'm using on VM nodes:
> sheep -g -c zookeeper:172.16.0.15:2181,172.31.200.249:2181,
> 172.31.200.250:2181,timeout=30 -y 172.16.0.10 -i
> host=192.168.10.10,port=7001 -w dir=/mnt/sheep_objcache,size=213000
>
>    Now I'm curious about object cache failover. What happen if volume
>> with cache will fail? Will sheep and VMs live or will they die?
>>
>
>  I'm also curious.
>  I think it's not handled as of now.
>  It would be good that, in case of I/O error from the cache device, sheep
> disables cache (like a node md unplug).
>
> Morita Kazukata writes that VMs must survive. I will try to do some tests.
>
>
>
>> (I found that with restart of sheep process VMs connected to it dying)
>>
>
>  They shouldn't, but this depends on your qemu version.
>  Qemu supports auto-reconnect. As soon as sheep daemon is available
> again, the vm will issue their I/O requests.
>
>
> Tried twice with QEMU 1.6.1. Both times result was negative.
>
> --
> sheepdog-users mailing lists
> sheepdog-users at lists.wpkg.org
> http://lists.wpkg.org/mailman/listinfo/sheepdog-users
>
>


-- 
Personal hosting by icez network
http://www.thzhost.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.wpkg.org/pipermail/sheepdog-users/attachments/20140204/cf32e068/attachment-0005.html>