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I just upgraded to Solaris 10 Update 10, and one of the improvements
is "zfs diff".

Using the "birthtime" of the sectors, I would expect very high
performance. The actual performance doesn't seems better that an
standard "rdiff", though. Quite disappointing...

Should I disable "atime" to improve "zfs diff" performance? (most data
doesn't change, but "atime" of most files would change).

"""
[root@buffy backups]# zfs list datos/backups/buffy
NAME                  USED  AVAIL  REFER  MOUNTPOINT
datos/backups/buffy  8.95G   553G  7.55G  /backups/buffy

[root@buffy backups]# time zfs diff -Ft
datos/backups/buffy@20110926-20:22 datos/backups/buffy@20110926-20:35
1317061842.659141598    M       /       /backups/buffy/root/proc
1317061812.437869058    M       /       /backups/buffy/root/dev/fd
1317061816.752409624    M       |
/backups/buffy/root/etc/saf/_sacpipe
1317061816.791269117    M       |
/backups/buffy/root/etc/saf/zsmon/_pmpipe
1317061817.291653834    M       /
/backups/buffy/root/etc/svc/volatile
1317061934.727002843    M       F       /backups/buffy/var/adm/lastlog
1317061934.796205623    M       F       /backups/buffy/var/adm/wtmpx
1317061938.764996484    M       F
/backups/buffy/var/ntp/ntpstats/loopstats
1317061938.978388173    M       F
/backups/buffy/var/ntp/ntpstats/peerstats.20110926

real    10m0.272s
user    0m0.809s
sys     2m6.693s
"""

10 minutes to "diff" 7.55 GB is... disappointing.

This machine uses a 2-mirror configurations, and there is no more
activity going on in the machine. ZPOOL version 29, ZFS version 5.

Am I missing anything?

- -- 
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"Things are not so easy"      _/_/  _/_/    _/_/  _/_/    _/_/  _/_/
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"El amor es poner tu felicidad en la felicidad de otro" - Leibniz
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