From: Josh Durgin <josh.durgin@inktank.com>
To: Stefan Priebe - Profihost AG <s.priebe@profihost.ag>
Cc: "ceph-devel@vger.kernel.org" <ceph-devel@vger.kernel.org>
Subject: Re: recommanded cache setting for rbd image
Date: Mon, 05 Nov 2012 15:57:11 -0800 [thread overview]
Message-ID: <50985257.3040304@inktank.com> (raw)
In-Reply-To: <5097D2DD.2000006@profihost.ag>
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.
next prev parent reply other threads:[~2012-11-05 23:57 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 [this message]
2012-11-06 7:34 ` Stefan Priebe - Profihost AG
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