Two machines, almost identical (same 3ware 9650se sata raid
card, same 500 GB hitachi drives, etc.)
First machine is running 6.1-RELEASE ... never noticed
anything odd.
Second machine is running 6.2-RELEASE.
These machines are very simple office fileservers. So there
is a / partition, a /var, and then a big monster raid-5
array with all the rest of the space. So it is very rare
that anyone actually runs any interactive commands in the
shell or does any access to files on the / or the /var
filesystems. The VAST majority of all usage is on the big
array.
On the first machine (6.1) there is no noticable lag when
accessing / and /var ...
but on the second machine (6.2) there is a very long wait -
sometimes 20 seconds or more - for commands that deal with
the / or /var ... for instance, if I:
grep username /etc/passwd
or:
tail -200 /var/log/messages
those commands can take 10-20 seconds to complete. But
then, if you run subsequent commands they are quick. Once
you do some work on / or /var, their speed picks back up.
So it would appear that files in / and /var are just nowhere
in the cache at all ... which isn't so odd, but what is odd
is that the problem is not seen on the first system.
So was there any major differences between 6.1 and 6.2 in
the filesystem caching and strategies that would account for
this difference ? Any comments at all on what I am seeing
?
---------------------------------
Ahhh...imagining that irresistible "new car"
smell?
Check outnew cars at Yahoo! Autos.
_______________________________________________
freebsd-fs freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-fs
To unsubscribe, send any mail to
"freebsd-fs-unsubscribefreebsd.org"
|
