From: Neil Brown <neilb@suse.de>
To: mark delfman <markdelfman@googlemail.com>
Cc: Linux RAID Mailing List <linux-raid@vger.kernel.org>
Subject: Re: Write cache
Date: Fri, 3 Dec 2010 12:27:39 +1100 [thread overview]
Message-ID: <20101203122739.32af28a1@notabene.brown> (raw)
In-Reply-To: <AANLkTim+dHWMeZkdFuRiimmNdkZ04j9tO3DCyOPAdxJK@mail.gmail.com>
On Thu, 2 Dec 2010 15:58:51 +0000 mark delfman <markdelfman@googlemail.com>
wrote:
> Hi
>
> Is there any way to use an MD RAID in write through mode? I
> appreciate that there is a performance impact but this is important
> from a security prospective....
MD RAID does work in write-through mode. I have occasionally thought about
adding a write-back mode which would make sense now that we have a sensible
flushing infrastructure in Linux. But I haven't implemented it.
>
> The likelihood is that I would use RAID0 (I know this sounds like a
> contradiction to the above, but the ‘drives’ are probably hardware
> RAIDs). But may use standard RAID6.
RAID0 doesn't do any caching at all.
>
> I cannot see any way to disable write cache in MD, but I am hopefully
> I am simply missing something obvious.
Why do you think these is a write-behind cache in MD ??
NeilBrown
>
> I appreciate any feedback....
>
> Thanks, Mark
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next prev parent reply other threads:[~2010-12-03 1:27 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-02 15:58 Write cache mark delfman
2010-12-03 1:27 ` Neil Brown [this message]
2010-12-03 13:09 ` mark delfman
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