From: John Robinson <john.robinson@anonymous.org.uk>
To: Jon@eHardcastle.com
Cc: Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: Raid 5 - not clean and then a failure.
Date: Wed, 26 Aug 2009 13:47:13 +0100 [thread overview]
Message-ID: <4A952ED1.8040305@anonymous.org.uk> (raw)
In-Reply-To: <73066.92033.qm@web51304.mail.re2.yahoo.com>
On 26/08/2009 12:29, Jon Hardcastle wrote:
[...]
> I did look into bitmaps *abit* i could easily have the imagine for my 6 drive raid 5 stored on the raid1 I have in the same system.. The googling I did tho did not paint a pretty picture it talked about huge performance hits?
There is a performance hit but it can be minimised by picking a bitmap
chunk size to suit; I ended up getting about 80% of bitmap-less write
performance using a 16MB bitmap chunk size instead of about 40% with the
default size, on my 3-drive RAID-5 array.
Cheers,
John.
next prev parent reply other threads:[~2009-08-26 12:47 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-25 7:54 Raid 5 - not clean and then a failure Jon Hardcastle
2009-08-25 8:16 ` Robin Hill
2009-08-25 8:40 ` Jon Hardcastle
2009-08-25 9:34 ` Robin Hill
2009-08-25 13:47 ` John Robinson
2009-08-25 14:11 ` Jon Hardcastle
2009-08-26 11:02 ` Jon Hardcastle
2009-08-26 11:18 ` Goswin von Brederlow
2009-08-26 11:29 ` Jon Hardcastle
2009-08-26 12:47 ` John Robinson [this message]
2009-08-26 20:34 ` Goswin von Brederlow
2009-08-26 14:14 ` Ryan Wagoner
2009-08-26 14:19 ` Jon Hardcastle
2009-08-26 14:50 ` Robin Hill
2009-08-26 14:33 ` Robin Hill
2009-08-26 20:35 ` Goswin von Brederlow
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