Hi Jeroen, Adam! > link. Switched write caching off with the following > addition to the /kernel/drv/sd.conf file (Karsten: if > you didn't do this already, you _really_ want to :)
Okay, I bite! :) format->inquiry on the F20 FMods disks returns: # Vendor: ATA # Product: MARVELL SD88SA02 So I put this in /kernel/drv/sd.conf and rebooted: # KAW, 2010-03-31 # Set F20 FMod devices to non-volatile mode # See http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Cache_Flushes sd-config-list = "ATA MARVELL SD88SA02", "nvcache1"; nvcache1=1, 0x40000,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1; Now the tarball extraction test with active ZIL finishes in ~0m32s! I've tested with a mirrored SSD log and two separate SSD log devices. The runtime is nearly the same. Compared to the 2m42s before the /kernel/drv/sd.conf modification this is a huge improvement. The performance with active ZIL would be acceptable now. But is this mode of operation *really* safe? FWIW zilstat during the test shows this: N-Bytes N-Bytes/s N-Max-Rate B-Bytes B-Bytes/s B-Max-Rate ops <=4kB 4-32kB >=32kB 0 0 0 0 0 0 0 0 0 0 1039072 1039072 1039072 3772416 3772416 3772416 610 299 311 0 1522496 1522496 1522496 5402624 5402624 5402624 874 429 445 0 2292952 2292952 2292952 6746112 6746112 6746112 931 215 716 0 2321272 2321272 2321272 6774784 6774784 6774784 931 208 723 0 2303472 2303472 2303472 6549504 6549504 6549504 897 195 702 0 2222632 2222632 2222632 6733824 6733824 6733824 935 226 709 0 2198328 2198328 2198328 6668288 6668288 6668288 926 224 702 0 2170000 2170000 2170000 6373376 6373376 6373376 878 200 678 0 2185416 2185416 2185416 6352896 6352896 6352896 874 197 677 0 2218040 2218040 2218040 6516736 6516736 6516736 897 203 694 0 2436984 2436984 2436984 6549504 6549504 6549504 885 171 714 0 I.e. ~900 ops/s. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
