Re: [Networker] atimeasm and ZFS
2009-09-18 10:18:52
Nick,
The following shows my results for NW 7.4 SP5 on ZFS Solaris 10U7 for SPARC:
I also did a test on a amd64 machine with OpenSolaris 0906 and ZFS, and I have
no problem there either;
Perhaps there is a bug in your NetWorker directive, or is the utime() system
call failing on your system for some reason ? Are you sure that there is a
problem at all (you can check as below).
# cat /etc/release
Solaris 10 5/09 s10s_u7wos_08 SPARC
Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
Use is subject to license terms.
Assembled 30 March 2009
# strings /usr/bin/save | grep '(#)'
@(#) Product: NetWorker
@(#) Release: 7.4.5.Build.726
@(#) Build number: 726
@(#) Build date: Thu Aug 6 15:20:55 PDT 2009
@(#) Build arch.: solaris7w
@(#) Build info: DBG=0,OPT=-O2 -fno-strict-aliasing
# nsrmm
file disk DISK mounted on /ftp/disk, write enabled
# zfs get atime rpool/u
NAME PROPERTY VALUE SOURCE
rpool/u atime on default
# ls -ult myfile
-rw-r--r-- 1 root root 0 Sep 18 07:25 myfile
# cat .nsr
<< /u >>
atimeasm : *
# truss -o trace save -s r280 myfile
66135:(pid 13211): NSR directive file (/u/.nsr) parsed
/u/myfile
66135:(pid 13211): NSR directive file (/u/.nsr) parsed
/u/
/u//
/
save: /u/myfile 2 KB 00:00:01 4 files
# grep utime trace
utime("/u/myfile", 0xFFFFFFFF7FFE5D90) = 0
So you can see that NetWorker reads atime, modifies the file, then resets the
atime using utime().
# ls -ul myfile
-rw-r--r-- 1 root root 0 Sep 18 07:25 myfile
If we do the same thing without directive, the atime is modified:
# rm .nsr
# truss -o trace save -s r280 myfile
/u/myfile
/u/
/
save: /u/myfile 2 KB 00:00:01 3 files
# grep utime trace
# ls -ul myfile
-rw-r--r-- 1 root root 0 Sep 18 16:00 myfile
So if I try it without .nsr directive, the atime is updated (as expected due to
the zfs get atime property).
With the .nsr directive, NetWorker is issuing a utime() system call,
to reset the atime, and the ZFS filesystem is correctly resetting this.
That's at least what I seem to observe on these 2 solaris systems.
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