I can imagine /etc/mtab being read once for every line in /etc/exports,
but unless your /etc/exports is very big, I can't easily see why it
would be read 900 times.
Maybe lots of different mount points are being accessed by something and
each one triggers a few reads...
Can you show your /etc/exports file?
These get generated via puppet and dropped into /etc/exports.d/
Any given host will have 3 files associated with it:
root@charlie-storage1:~# cat
/etc/exports.d/client1.cs.uchicago.edu.charliestorage1_fsidroot.charliestorage1_fsidroot.exports
/tank
client1.cs.uchicago.edu(fsid=0,rw,async,no_subtree_check,insecure,crossmnt)
root@charlie-storage1:~# cat
/etc/exports.d/client1.cs.uchicago.edu.charliestorage1_homes.charliestorage1_homes.exports
/tank/homes
client1.cs.uchicago.edu(rw,async,no_subtree_check,insecure,crossmnt)
root@charlie-storage1:~# cat
/etc/exports.d/client1.cs.uchicago.edu.charliestorage1_stage.charliestorage1_stage.exports
/tank/stage
client1.cs.uchicago.edu(rw,async,no_subtree_check,insecure,crossmnt)
Here we can see that there are 960 files in /etc/exports.d
root@storage1:~# find /etc/exports.d/ -type f | wc
960 960 88701
You probably don't want or need this but here is a link to all of my
/etc/exports.d/ combined into one file which I redacted the hostnames:
http://people.cs.uchicago.edu/~kauffman/nfs-kernel-server/all_etc_exports.d_in_one_file.txt
I don't recommend this approach. If you have data, just provide it. If
it is really really big, provide a link.
You have my attention now. You might not get it again when you send the
strace. You might have wasted your opportunity.
Yes - please provide the strace showing lots of reads through
/etc/mtab. Don't provide it privately to me. Either post it to the
list, or post a link to it.
Thanks for the advice.
Here is a link to a best effort redacted strace:
http://people.cs.uchicago.edu/~kauffman/nfs-kernel-server/redacted_strace.txt
I would prefer to keep user name leakage to a minimum.
Cheers,
Phil
--
Phil Kauffman
Systems Admin
Dept. of Computer Science
University of Chicago
kauffman@xxxxxxxxxxxxxxx
773-702-3913
--
To unsubscribe from this list: send the line "unsubscribe linux-nfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
