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From: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
To: Josh Durgin <josh.durgin@inktank.com>
Cc: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: recommanded cache setting for rbd image
Date: Tue, 06 Nov 2012 08:34:15 +0100	[thread overview]
Message-ID: <5098BD77.1050202@profihost.ag> (raw)
In-Reply-To: <50985257.3040304@inktank.com>

Am 06.11.2012 00:57, schrieb Josh Durgin:
> On 11/05/2012 06:53 AM, Stefan Priebe - Profihost AG wrote:
>> Hello list,
>>
>> right now i'm testing rbd block devices with kvm using Default cache (no
>> cache).
>>
>> Is there any recommanded value for RBD? (i don't wanna loose data)
>
> It acts like a well-behaved disk cache (i.e. it respects
> flushes/barriers from the guest), so it's no more likely to cause data
> loss than a local hard disk in the event of an unexpected shutdown.
>
> I recommend running it in writeback mode (the default when rbd cache =
> true). The best cache size will depend on your workload and hardware.

Thanks i'll check how this influence my disks and storage.

Thanks!

Stefan

      reply	other threads:[~2012-11-06  7:34 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-05 14:53 recommanded cache setting for rbd image Stefan Priebe - Profihost AG
2012-11-05 23:57 ` Josh Durgin
2012-11-06  7:34   ` Stefan Priebe - Profihost AG [this message]

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