Date: Mon, 10 Dec 2001 10:13:20 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Mike Smith <msmith@FreeBSD.ORG> Cc: Terry Lambert <tlambert2@mindspring.com>, Joerg Wunsch <joerg_wunsch@uriah.heep.sax.de>, freebsd-current@FreeBSD.ORG Subject: Re: cvs commit: src/sys/kern subr_diskmbr.c Message-ID: <200112101813.fBAIDKo47460@apollo.backplane.com> References: <200112101754.fBAHsRV01202@mass.dis.org>
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:Spindle sync is an anachronism these days; asynchronous behaviour
:(write-behind in particular) is all the rage. You'd be hard-pressed to
:find drives that even support it anymore.
Woa! Say what? I think you are totally incorrect here Mike.
Spindle sync is not an anachronism. You can't get good RAID{0,2,3,4,5}
performance without it - for reading OR writing. It doesn't matter
so much for RAID{1,10}, but it matters a whole lot for something like
RAID-5 where the difference between a spindle-synced read or write
and a non-spindle-synched read or write can be upwards of 35%.
-Matt
Matthew Dillon
<dillon@backplane.com>
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