linux-kernel - Re: Question about "Not Ready" SCSI error

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Message-ID: <877j1tid0h.fsf@tantale.fifi.org>
Date:	31 Jul 2006 16:13:34 -0700
From:	Philippe Troin <phil@...i.org>
To:	Patrick Mau <mau@...ar.ping.de>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: Question about "Not Ready" SCSI error

Patrick Mau <mau@...ar.ping.de> writes:

> Hallo everyone
> 
> Today one of my SCSI drives decided to shutdown for no obvious reason.
> I suspect heat or a bad power supply. Syslog shows a repeating stream
> of the following:
> 
> Jul 30 15:51:30 tony kernel: sd 0:0:0:0: Device not ready: <6>: Current: sense key=0x2
> Jul 30 15:51:30 tony kernel: ASC=0x4 ASCQ=0x2
> Jul 30 15:51:30 tony kernel: end_request: I/O error, dev sda, sector 617358
> 
> Google revealed[1] that the drive is waiting for a START UNIT command,
> but it seems that the kernel is not attempting to spin up the drive
> again. 
> 
> After a complete power-cycle the drive worked again. I just wanted to
> know if this is a shortcoming in the SCSI error handling codepath.

I'll have to report that I've seen a few drives behaving similarly,
both on 2.4.x and 2.6.x.

Is that an expected behavior from SCSI hard drives?  Any SCSI guru
would be able to answer this one?

Phil.

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