Date: Thu, 8 Aug 2013 13:42:38 +0200 From: Terje Elde <terje@elde.net> To: Frank Leonhardt <frank2@fjl.co.uk> Cc: "freebsd-questions@freebsd.org" <freebsd-questions@freebsd.org> Subject: Re: Terrible disk performance with LSI / FreeBSD 9.2-RC1 Message-ID: <02C07E9F-ABB3-4A38-9638-21F913A08EC1@elde.net> In-Reply-To: <5202C558.3010305@fjl.co.uk> References: <CABXB=RSRnB41yjq5Qcbiz-JCRssNwx2AatJ2Dn%2BHhuD9GaBh%2Bw@mail.gmail.com> <CAEhBLvg7ZUMja5zpFm2UQBXESW-0fL9L7EatR2aasstXd8ALHA@mail.gmail.com> <CABXB=RRvp0BLURq7M9iBb5anqaGsrvXeA1WmAroNji6bZP8p4w@mail.gmail.com> <5202C558.3010305@fjl.co.uk>
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On 8. aug. 2013, at 00:08, Frank Leonhardt <frank2@fjl.co.uk> wrote: > As a suggestion, what happens if you read from the drives directly? Boot i= n single user and try reading a Gb or two using /bin/dd. It might eliminate o= r confirm a problem with ZFS. If not too inconvenient, it'd be very interesting to see what'd happen if yo= u were to physically disconnect (data and power) 5 of the 6 drives, then boo= t and dd from the remaining disk to /dev/null. Then repeat with another driv= e.=20 You could boot from USB to leave the system itself otherwise untouched.=20 The reason I'm suggesting is that I'm wondering if this can be down to a pow= er or cable-issue, locking things up or causing retransmits, etc.=20 Not sure if this would always be logged, others might be able to enlighten t= hat issue.=20 Terje
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