Date: Sat, 20 Feb 1999 12:58:32 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Paul van der Zwan <paulz@trantor.xs4all.nl> Cc: "Kenneth D. Merry" <ken@plutotech.com>, freebsd-current@FreeBSD.ORG Subject: Re: Slow seq. write on Seagate ST36530N Message-ID: <199902202058.MAA11080@apollo.backplane.com> References: <199902201159.MAA01220@trantor.xs4all.nl>
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:This did not improve anything , but I think I have found the couse.
:In that modepage there is a DISC value which was 0 on the IBM and 1 on the
:Seagate. I remembered a ' Enable disconnect' option in the Adaptec 2940 bios,
:setting this to 'off' for both harddisks led to a huge performance increase on
:the Seagate. If I also enable Ultra mode iozone write goes from 1.5 MB/s
:to 12 MB/s ( a factor of 8 !!!).
:
: Paul
:
:--
:Paul van der Zwan paulz @ trantor.xs4all.nl
There's something wrong. Disconnection should not cause that sort
of performance decrease. Disconnection is necessary if you want to
maintain preformance with more then one scsi device on the scsi bus.
-Matt
Matthew Dillon
<dillon@backplane.com>
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