From: Asdo <asdo@shiftmail.org>
To: Richard Scobie <richard@sauce.co.nz>
Cc: Michael Evans <mjevans1983@gmail.com>,
Roger Heflin <rogerheflin@gmail.com>,
Matt Tehonica <matt.tehonica@mac.com>,
linux-raid@vger.kernel.org
Subject: Re: Typical RAID5 transfer speeds
Date: Mon, 21 Dec 2009 12:30:34 +0100 [thread overview]
Message-ID: <4B2F5C5A.7070702@shiftmail.org> (raw)
In-Reply-To: <4B2ED47C.7010307@sauce.co.nz>
Richard Scobie wrote:
> Or use dumb LSI SAS controllers (sas3442e-r with IT firmware loaded,
> $200) and port expander based chassis that allow considerable
> flexibility regarding md RAID and number of SAS/SATA drives attached.
The problem then becomes choosing the port expander chassis...
I know nothing about this topic :-(
Does the brand/model make difference in performance or reliability?
Do you have any recommendation? Even just one "known good"...
(These chassis are also quite expensive for what I can see.)
Up to 24 and maybe even 48 drives you can find monolithic solutions (one
chassis for mainboard and disks), but then not many brands make 16-24
ports controllers. LSI does not seem to make them, am I correct?
Also in a monolithic storage you only have to check that the controller
declares compatibility with the drives (sometimes there are indeed
issues) while for port-replicator based storage I don't know if I should
check the Compatibility List for drives against controllers, or for
drives against port replicator, or for controller against port
replicator...?
next prev parent reply other threads:[~2009-12-21 11:30 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-12-19 0:37 Typical RAID5 transfer speeds Matt Tehonica
2009-12-19 1:05 ` Bernd Schubert
2009-12-19 8:30 ` Thomas Fjellstrom
2009-12-19 9:38 ` Michael Evans
2009-12-19 11:43 ` John Robinson
2009-12-19 19:18 ` Leslie Rhorer
2009-12-21 13:06 ` Goswin von Brederlow
2009-12-19 21:35 ` Roger Heflin
2009-12-20 4:21 ` Michael Evans
2009-12-20 9:55 ` Thomas Fjellstrom
2009-12-20 14:53 ` Andre Tomt
2009-12-20 16:03 ` Thomas Fjellstrom
2009-12-20 18:28 ` Roger Heflin
2009-12-21 1:18 ` Michael Evans
2009-12-21 1:50 ` Richard Scobie
2009-12-21 11:30 ` Asdo [this message]
2009-12-21 18:28 ` Richard Scobie
2009-12-20 10:04 ` Erwan MAS
2009-12-20 10:31 ` Keld Jørn Simonsen
2009-12-20 15:25 ` Andre Tomt
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