On 12-05-07 12:18 PM, Jim Klimov wrote:
During the send you can also monitor "zpool iostat 1" and usual
"iostat -xnz 1" in order to see how busy the disks are and how
many IO requests are issued. The snapshots are likely sent in
the order of block age (TXG number), which for a busy pool may
mean heavy fragmentation and lots of random small IOs..
I have been able to verify that I can get a zfs send at 135MB/sec for a
striped pool with 2 internal drives on the same server.
Each dataset had about 3-4 snapshots. There were about 36 datasets
I deleted the snapshots and the speed may have increased slightly.
Given "iostat -xnz 1" it looks like the IO's are very high. So I guess
the drives are badly fragmented.
So is fixing this going to require a zfs pool rebuild?
Karl
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 4.0 0.0 16.0 0.0 0.0 0.0 0.0 0 0
c0t500151795955D430d0
0.0 4.0 0.0 16.0 0.0 0.0 0.0 0.0 0 0
c0t500151795955BDB6d0
0.0 1.0 0.0 8.0 0.0 0.0 0.0 0.1 0 0
c0t5001517BB271845Dd0
759.0 0.0 4800.0 0.0 0.0 2.9 0.0 3.8 0 75
c0t5000C500103F2057d0
887.0 0.0 4738.0 0.0 0.0 1.6 0.0 1.8 0 42
c0t5000C500103E9FFBd0
915.0 0.0 4628.5 0.0 0.0 1.5 0.0 1.6 0 30
c0t5000C5000440AA0Bd0
922.0 0.0 4676.5 0.0 0.0 1.0 0.0 1.1 0 26
c0t5000C500103E120Fd0
970.0 0.0 4276.0 0.0 0.0 1.0 0.0 1.0 0 20
c0t5000C500103E370Fd0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 4.0 0.0 32.0 0.0 0.0 0.0 0.1 0 0
c0t5001517BB271845Dd0
1363.0 0.0 9007.8 0.0 0.0 2.0 0.0 1.5 1 54
c0t5000C500103F2057d0
1405.0 0.0 10169.2 0.0 0.0 1.8 0.0 1.3 1 37
c0t5000C500103E9FFBd0
1448.0 0.0 9884.2 0.0 0.0 1.7 0.0 1.2 1 40
c0t5000C5000440AA0Bd0
1264.0 0.0 9537.3 0.0 0.0 2.1 0.0 1.7 0 51
c0t5000C500103E120Fd0
1260.0 0.0 9749.8 0.0 0.0 1.9 0.0 1.5 0 44
c0t5000C500103E370Fd0
extended device statistics
r/s w/s kr/s kw/s wait actv wsvc_t asvc_t %w %b device
0.0 6.0 0.0 24.0 0.0 0.0 0.0 0.0 0 0
c0t500151795955D430d0
0.0 6.0 0.0 24.0 0.0 0.0 0.0 0.0 0 0
c0t500151795955BDB6d0
1023.0 0.0 5131.6 0.0 0.0 1.6 0.0 1.6 0 45
c0t5000C500103F2057d0
1003.0 0.0 5040.1 0.0 0.0 1.5 0.0 1.5 0 36
c0t5000C500103E9FFBd0
959.0 0.0 5069.1 0.0 0.0 1.7 0.0 1.8 0 46
c0t5000C5000440AA0Bd0
941.0 0.0 5117.6 0.0 0.0 1.7 0.0 1.8 0 45
c0t5000C500103E120Fd0
1043.0 0.0 5034.1 0.0 0.0 1.0 0.0 1.0 0 24
c0t5000C500103E370Fd0
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