From: David Eckhardt <davide+receptionist@cs.cmu.edu>
To: 9fans@cse.psu.edu
Subject: [9fans] Seagate Barracuda 7200.7 write cache?
Date: Tue, 13 Jul 2004 08:25:21 +0000 [thread overview]
Message-ID: <ccvpdp$q0e$1@wolfberry.srv.cs.cmu.edu> (raw)
Am I being overly paranoid?
http://www.seagate.com/docs/pdf/datasheet/disc/ds_barracuda7200.7.pdf
is the "data sheet" for the SATA version of the Seagate Barracuda.
Section 4.3.2 ("Set Features command") on logical page 31 (physical
page 41) seems to indicate that the drive defaults to handling sector
writes via a write-back RAM cache, which the host OS can disable.
Is it just me or is this a very bad default except (maybe) for
battery-backed systems? Is this a standard thing in IDE disks
(either the feature number or the default setting), something
Plan 9 should watch out for, nothing for me to worry my pretty
little head about, ...?
Dave Eckhardt
next reply other threads:[~2004-07-13 8:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-07-13 8:25 David Eckhardt [this message]
2004-07-13 8:48 ` Boris Maryshev
2004-07-16 17:03 ` David Eckhardt
2004-07-16 18:52 ` ron minnich
2004-07-16 19:22 ` Brantley Coile
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