Bob Friesenhahn wrote:
On Sun, 18 Apr 2010, Carson Gaspar wrote:
Before (Mac OS 10.6.3 NFS client over GigE, local subnet, source file
in RAM):
carson:arthas 0 $ time tar jxf /Volumes/RamDisk/gcc-4.4.3.tar.bz2
real 92m33.698s
user 0m20.291s
sys 0m37.978s
That's awful!
...
tar jxf ~/scratch/gcc-4.4.3.tar.bz2 54.76s user 99.63s system 39% cpu
6:30.00 total
...
My NFS server is a Sun Ultra-40 M2 with storage on a Sun StorageTek 2540
arranged as six mirrors. No SSDs are used for the intent log. The
StorageTek 2540 seems to offer 330MB of battery-backed cache per
controller.
Yes, that much BB cache is plenty to make the 18MB per TXG ZIL writes
(based on your zilstat output) very fast indeed ;-)
Sadly my pool is raidz2 sans controller cache, thus the amazingly crappy
performance sans SLOG.
--
Carson
_______________________________________________
zfs-discuss mailing list
zfs-discuss@opensolaris.org
http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
