From: Keld Simonsen <keld@keldix.com>
To: Neil Brown <neilb@suse.de>
Cc: Gilad Arnold <arnold@cs.berkeley.edu>,
Bill Davidsen <davidsen@tmr.com>, Roman Mamedov <roman@rm.pp.ru>,
linux-raid@vger.kernel.org
Subject: Re: migrating from RAID5 to RAID10
Date: Fri, 18 Jun 2010 10:40:28 +0200 [thread overview]
Message-ID: <20100618084028.GA23230@rap.rap.dk> (raw)
In-Reply-To: <20100618083053.7df5248b@notabene.brown>
On Fri, Jun 18, 2010 at 08:30:53AM +1000, Neil Brown wrote:
>
> 2-drive RAID10 f2 would be expected to provide better read throughput
> (possibly twice as fast) at some cost to write throughput. For many people
> this is a worthwhile trade-off. So it might be better for you.
> Read throughput would degraded down to write throughput (i.e. slower than
> RAID1) if the RAID10 were degraded.
The slowdown of write thruput is on the raw raid, and on file systems
without elevator algorithms. If you employ a file system with an
elevator algorithm, then there will be no noticeable slowdown for
writes, as witnessed by many benchmarks.
best regards
keld
next prev parent reply other threads:[~2010-06-18 8:40 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-06-09 15:11 migrating from RAID5 to RAID10 Gilad Arnold
2010-06-10 18:52 ` Roman Mamedov
2010-06-10 19:58 ` Gilad Arnold
2010-06-10 22:11 ` Drew
2010-06-10 22:21 ` Drew
2010-06-10 22:30 ` Gilad Arnold
2010-06-10 22:26 ` Gilad Arnold
2010-06-16 15:54 ` Bill Davidsen
2010-06-16 18:30 ` Gilad Arnold
2010-06-16 20:15 ` Gilad Arnold
2010-06-17 1:59 ` Bill Davidsen
2010-06-16 21:26 ` Neil Brown
2010-06-17 17:44 ` Gilad Arnold
2010-06-17 22:30 ` Neil Brown
2010-06-18 8:40 ` Keld Simonsen [this message]
2010-06-21 22:09 ` Neil Brown
2010-06-17 22:46 ` Gilad Arnold
2010-06-18 2:39 ` Neil Brown
2010-06-18 4:01 ` Gilad Arnold
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