ffs snapshots & large disks

Hello,

I'm toying atm with a Dell Powervault 725N (dmesg attached), this box
will be used as a nas, disk layout is the following :

Filesystem       Size    Used   Avail Capacity  Mounted on
/dev/amrd0s1a    248M     76M    152M    33%    /
devfs            1.0K    1.0K      0B   100%    /dev
/dev/amrd0s1e    248M    6.0K    228M     0%    /tmp
/dev/amrd0s1f    2.8G    1.7G    836M    68%    /usr
/dev/amrd0s1d    496M    450K    456M     0%    /var
/dev/amrd1s1d    672G    794M    617G     0%    /vol0

I've just tested snapshots on /vol0 filesystem :
emss_at_terra:/usr# time mksnap_ffs /vol0 /vol0/.snap/snap0
0.000u 15.634s 32:57.18 0.7%    5+234k 56071+71989io 0pf+0w

/vol0 only contains a copy of /usr/src.

Kernel conf is a plain stock GENERIC from today's current.

Is there any way to speed up snapshot creation ?

Regards.

Eric Masson

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