[sheepdog-users] Sheepdog Block Device SPOF and kernel log size

[Michał Chybowski]

W dniu 09.07.2015 o 17:29, Hitoshi Mitake pisze:
> At Thu, 09 Jul 2015 17:15:08 +0200,
> Michał Chybowski wrote:
>> Hi
>>
>> I've set up a Sheepdog cluster on 3 machines (as data hosts) and 1
>> "client" machine, on which Sheepdog Block Devices will be used. I'd like
>> to associate them with more than one sheep daemon - is there any
>> possible way of doing this? I want to avoid death of services using SBD
>>
>> Also, my kern.log (using Debian wheezy) is growing extremely fast due to
>> SBD module logging almost every action. How can I avoid this?
> If you can use iSCSI interface of sheepdog, you can avoid SPOF because
> it supports multipath:
> https://github.com/sheepdog/sheepdog/wiki/General-protocol-support-(iSCSI-and-NBD)
Ok, I'm sure I'll try this but is there any multipath config file or so 
for SBD? I'd love to test this out but at the moment only thing I get 
from multipath is:

root at compute1:~# multipath -p failover /dev/sbd0
Jul 10 00:43:22 | DM message failed [fail_if_no_path]

which with -v3 gives more information:

Jul 10 00:44:09 | sbd0: ownership set to lolek
Jul 10 00:44:09 | sbd0: not found in pathvec
Jul 10 00:44:09 | sbd0: mask = 0xc
Jul 10 00:44:09 | sbd0: get_state
Jul 10 00:44:09 | sbd0: path checker = directio (internal default)
Jul 10 00:44:09 | sbd0: path inaccessible

and with -v4:
Jul 10 01:03:50 | Discover device /sys/block/sbd0
Jul 10 01:03:50 | path /sys/block/sbd0/device not present
Jul 10 01:03:50 | Discover device /sys/block/sbd1
Jul 10 01:03:50 | path /sys/block/sbd1/device not present

I hope there is some way to utilize SBD instead of using iSCSI.

>
> Recent talk of Ishizaki-san has a brief description about the
> multipath mechanism:
> http://events.linuxfoundation.jp/sites/events/files/slides/COJ2015_Sheepdog_20150604.pdf
>
> I think you are using linux as a client. We are testing the iSCSI
> feature with open-iscsi initiator. Therefore you would be able to use
> the initiator in your environment.
>
> # the description of multipath setup is still under construction. I'll
> # prepare it later. tests/functional/097 has a way of multipath setup
>
> Thanks,
> Hitoshi
>
>> -- 
>> Reards
>> Michał Chybowski
>> Tiktalik.com
>>
>> -- 
>> sheepdog-users mailing lists
>> sheepdog-users at lists.wpkg.org
>> https://lists.wpkg.org/mailman/listinfo/sheepdog-users

Thanks
Michał Chybowski
Tiktalik.com



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