Re: NFS server waking up sleeping disks

[Timo Sirainen <tss@iki.fi>]

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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:

01:22:06.662763 open("/proc/partitions", O_RDONLY) = 9
..
01:22:06.663000 open("/dev/hda6", O_RDONLY) = 11
..
01:22:06.663175 read(11, "&s\301_\177{/x\24d\240\262\264\256a\374yy\327\6`l/\271"..., 4096) = 4096
01:22:11.678610 lseek(11, 0, SEEK_SET)  = 0

I'll go figure out why it's doing this.

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