Re: Enclosure power failure pausing client IO till all connected hosts up

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Здравствуйте! 

On Tue, Jul 07, 2015 at 02:21:56PM +0530, mallikarjuna.biradar wrote:

> Hi all,

> Setup details:
> Two storage enclosures each connected to 4 OSD nodes (Shared storage).
> Failure domain is Chassis (enclosure) level. Replication count is 2.
> Each host has allotted with 4 drives.

> I have active client IO running on cluster. (Random write profile with
> 4M block size & 64 Queue depth).

> One of enclosure had power loss. So all OSD's from hosts that are
> connected to this enclosure went down as expected.

> But client IO got paused. After some time enclosure & hosts connected
> to it came up.
> And all OSD's on that hosts came up.

> Till this time, cluster was not serving IO. Once all hosts & OSD's
> pertaining to that enclosure came up, client IO resumed.


> Can anybody help me why cluster not serving IO during enclosure
> failure. OR its a bug?

With replication factor 2 You have to take 3+ nodes in order to serve clients. If chooseleaf type > 0.

-- 
WBR, Max A. Krasilnikov
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