From: Neil Brown <neilb@suse.de>
To: russell@coker.com.au
Cc: linux-raid@vger.kernel.org, pkg-mdadm-devel@lists.alioth.debian.org
Subject: Re: write-intent bitmaps
Date: Sun, 27 Jan 2008 22:21:33 +1100 [thread overview]
Message-ID: <18332.26941.370395.885100@notabene.brown> (raw)
In-Reply-To: message from Russell Coker on Sunday January 27
On Sunday January 27, russell@coker.com.au wrote:
> http://lists.debian.org/debian-devel/2008/01/msg00921.html
>
> Are they regarded as a stable feature? If so I'd like to see distributions
> supporting them by default. I've started a discussion in Debian on this
> topic, see the above URL for details.
Yes, it is regarded as stable.
However it can be expected to reduce write throughput. A reduction of
several percent would not be surprising, and depending in workload it
could probably be much higher.
It is quite easy to add or remove a bitmap on an active array, so
making it a default would probably be fine providing it was easy for
an admin to find out about it and remove the bitmap is they wanted the
extra performance.
NeilBrown
next prev parent reply other threads:[~2008-01-27 11:21 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-27 10:34 write-intent bitmaps Russell Coker
2008-01-27 11:21 ` Neil Brown [this message]
2008-01-27 15:12 ` Russell Coker
[not found] ` <479E1BB3.2080702@tmr.com>
2008-01-29 7:32 ` Russell Coker
2008-01-29 9:13 ` Peter Rabbitson
2008-01-29 9:40 ` Russell Coker
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