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Date:      Thu, 8 Aug 2013 13:42:38 +0200
From:      Terje Elde <>
To:        Frank Leonhardt <>
Cc:        "" <>
Subject:   Re: Terrible disk performance with LSI / FreeBSD 9.2-RC1
Message-ID:  <>
In-Reply-To: <>
References:  <> <> <> <>

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On 8. aug. 2013, at 00:08, Frank Leonhardt <> 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=

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


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