From: Tejun Heo <htejun@gmail.com>
To: Fajun Chen <fajunchen@gmail.com>
Cc: linux-ide@vger.kernel.org
Subject: Re: Question about Scsi error handling/recovery
Date: Thu, 19 Oct 2006 10:50:53 +0900 [thread overview]
Message-ID: <4536D9FD.4050708@gmail.com> (raw)
In-Reply-To: <8202f4270610181711k7b15f81bw589f956f6e521988@mail.gmail.com>
Fajun Chen wrote:
> Hi,
>
> I tested two SATA drives on the same controller (Sil3124) and found
> that if their hotplug/unplug sequences overlaps, scsi layer will block
> the use of any of the drives during error recovery phase. So even if
> one drive is recovered way early, it won't process any commands until
> the error recovery on another drive is completed. Could someone
> explain why the block is on controller/host basis instead of on port
> basis? Is this because the controller could be reset during any error
> recovery?
I don't think that's true. Each ATA port is represented as separate
host to SCSI midlayer, so SCSI doesn't have any way to enforce such
cross-port synchronization. In fact, libata needs to implement such
facility to properly implement transfer mode reconfiguration on several
controllers. What exactly are you seeing?
--
tejun
next prev parent reply other threads:[~2006-10-19 1:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-19 0:11 Question about Scsi error handling/recovery Fajun Chen
2006-10-19 1:50 ` Tejun Heo [this message]
2006-10-19 15:22 ` Fajun Chen
2006-10-20 8:10 ` Tejun Heo
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