Hi, also see; http://www.mail-archive.com/zfs-discuss@opensolaris.org/msg45408.html
We hit this with Sol11 though, not sure if it's possible with sol10 Yours Markus Kovero -----Original Message----- From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-boun...@opensolaris.org] On Behalf Of Ding Honghui Sent: 8. kesäkuuta 2011 6:07 To: zfs-discuss@opensolaris.org Subject: [zfs-discuss] Wired write performance problem Hi, I got a wired write performance and need your help. One day, the write performance of zfs degrade. The write performance decrease from 60MB/s to about 6MB/s in sequence write. Command: date;dd if=/dev/zero of=block bs=1024*128 count=10000;date The hardware configuration is 1 Dell MD3000 and 1 MD1000 with 30 disks. The OS is Solaris 10U8, zpool version 15 and zfs version 4. I run Dtrace to trace the write performance: fbt:zfs:zfs_write:entry { self->ts = timestamp; } fbt:zfs:zfs_write:return /self->ts/ { @time = quantize(timestamp-self->ts); self->ts = 0; } It shows value ------------- Distribution ------------- count 8192 | 0 16384 | 16 32768 |@@@@@@@@@@@@@@@@@@@@@@@@ 3270 65536 |@@@@@@@ 898 131072 |@@@@@@@ 985 262144 | 33 524288 | 1 1048576 | 1 2097152 | 3 4194304 | 0 8388608 |@ 180 16777216 | 33 33554432 | 0 67108864 | 0 134217728 | 0 268435456 | 1 536870912 | 1 1073741824 | 2 2147483648 | 0 4294967296 | 0 8589934592 | 0 17179869184 | 2 34359738368 | 3 68719476736 | 0 Compare to a working well storage(1 MD3000), the max write time of zfs_write is 4294967296, it is about 10 times faster. Any suggestions? Thanks Ding _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
