From: Brian King <brking@us.ibm.com>
To: dougg@torque.net
Cc: Andrew Morton <akpm@osdl.org>,
linux-scsi@vger.kernel.org, Ruben Faelens <parasietje@gmail.com>
Subject: Re: Fw: SCSI device not spinning up on rw
Date: Sun, 04 Jun 2006 17:11:46 -0500 [thread overview]
Message-ID: <44835AA2.1070809@us.ibm.com> (raw)
In-Reply-To: <44825D9F.9070305@torque.net>
Douglas Gilbert wrote:
>> I have a SCSI disk, which I want to spin down when the system is not in
>> use. I do this by using sdparm, scsi-spin or sg-utils. These tools all
>> spin down the SCSI drive by using an IOCTL.
>>
>> Problem is that the kernel doesn't spin the drive back up. When a
>> process requests data from the disk (a simple ls), the kernel responds
>> with an I/O error. After some of these errors, reiserfs marks the drive
>> read-only.
Setting sdev->allow_restart in struct scsi_device will cause sense
key/code/qual of 02/04/02 (not ready, initialization command required)
to wake up the scsi error handler and will force scsi core to issue
a start unit command to the disk. I added this a while back to handle
ipr raid arrays which need a start unit command each time the adapter
gets reset. It would be easy enough for sd to use this, either
all the time, or only when directed to, or we could add a sysfs attribute
to the disk to enable/disable this behavior.
Brian
next prev parent reply other threads:[~2006-06-04 22:11 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-06-04 1:23 Fw: SCSI device not spinning up on rw Andrew Morton
2006-06-04 4:12 ` Douglas Gilbert
2006-06-04 22:11 ` Brian King [this message]
2006-06-05 18:04 ` Brian King
2006-07-11 6:20 ` Olaf Hering
2006-07-11 12:19 ` Stefan Richter
2006-07-11 12:57 ` Olaf Hering
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