From: Timo Reimann <mailinglist-d4LLFNs4DFRA7UZ8SB9NFg@public.gmane.org>
Subject: Re: NFS server waking up sleeping disks
Date: Sun, 09 Mar 2008 03:58:17 +0100
Message-ID: <47D35249.7020000@foo-lounge.de>
References: <1204969522.11220.680.camel@hurina>	 <47D29BC2.9000806@foo-lounge.de> <1205018864.11220.689.camel@hurina>
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Cc: linux-nfs@vger.kernel.org
To: Timo Sirainen <tss@iki.fi>
In-Reply-To: <1205018864.11220.689.camel@hurina>
Sender: linux-nfs-owner@vger.kernel.org

Timo Sirainen wrote:
> On Sat, 2008-03-08 at 14:59 +0100, Timo Reimann wrote:
>> Timo Sirainen wrote:
>>> My Linux 2.6.24.1 NFS server has two disks. One of them is rarely used,
>>> so it's normally sleeping and is not even mounted anywhere. But after
>>> the NFS mount hasn't been used for a while (some hours?) doing just a
>>> "ls" on NFS client causes the sleeping disk to wake up and the "ls"
>>> reply is delayed a few seconds until the wakeup is finished.
>>>
>>> Any ideas why it's waking up the disk that has nothing to do with NFS,
>>> and how to prevent it from doing this?
>> Your issue might be related to the same that I have (which is still
>> unresolved). Basically, my non-mounted backup disk keeps spinning up
>> after a rough 20-25 minutes of sleeping. Check out my archived thread
>> for details and hints how to determine disk-accessing processes:
>>
>> http://marc.info/?l=linux-nfs&m=120354580303104&w=2
>>
>> However, there is no `ls' or similar call required to wake up my disk.
>> It just happens.
> 
> Thanks, mountd is indeed the problem:
> 
> I'll go figure out why it's doing this.

If you find a solution prior to the other guys who offered their help to
me, please let us (especially me :) ) know.


--Timo