From: Anton Blanchard <anton@samba.org>
To: Christoph Hellwig <hch@lst.de>
Cc: James Bottomley <James.Bottomley@SteelEye.com>,
linux-scsi@vger.kernel.org
Subject: Re: [PATCH] serialize bus scanning
Date: Thu, 28 Aug 2003 06:29:08 +1000 [thread overview]
Message-ID: <20030827202908.GB7852@krispykreme> (raw)
In-Reply-To: <20030825122416.GE15506@lst.de>
Hi,
> Synchronize all scanning activity, this fixes long-standing races
> vs /proc/scsi/scsi and sysfs addition and deletion of devices.
>
> Note that this does not serialize removing, the lists will get
> their own locking soon.
Ive started playing with parallel probe in the lab (on some large ppc64
boxes). I know we have a lot of work to do before this will all work,
but would it be possible to make this semaphore per host?
Even with a per host semaphore, it annoys me how long it takes to spin
up 7 disks especially if a few of them are dead. Longer term are we
planning to overlap spinup of disks on the same host?
(We have a property in our device tree that says how quickly you can
spin disks up on the same host, eg 1sec apart. We should also be able to
do this in parallel on all hosts. We could easily read this property in
a small initramfs program and then issue probe commands via /sys)
Anton
next prev parent reply other threads:[~2003-08-27 20:33 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-25 12:24 [PATCH] serialize bus scanning Christoph Hellwig
2003-08-27 20:29 ` Anton Blanchard [this message]
2003-08-27 20:35 ` Christoph Hellwig
2003-09-10 7:57 ` Anton Blanchard
2003-09-11 20:34 ` Patrick Mansfield
2003-09-15 7:13 ` Anton Blanchard
2003-09-15 9:10 ` Christoph Hellwig
2003-08-27 22:32 ` Mike Anderson
2003-08-27 22:59 ` Anton Blanchard
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