raidz slowing down
Solon Lutz
solon at pyro.de
Thu Oct 8 09:37:23 UTC 2009
I built a 9x hdd 11TB raidz for some rescue purposes and started
copying an image from another partition via "dd if=/dev/da0..." to it.
It consists of: ad4 da1 da2 da3 da4 da5 da6 da7 da8, da1 to da8 are
connected via two highpoint controllers.
In the beginning write speeds were quite fair:
dT: 1.002s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 424 0 0 0.0 424 52483 33.9 84.6| ad4
0 0 0 0 0.0 0 0 0.0 0.0| da0
35 356 0 0 0.0 356 44584 76.4 124.5| da1
35 296 0 0 0.0 296 36919 84.5 121.0| da2
34 361 0 0 0.0 361 45111 75.5 124.7| da3
35 346 0 0 0.0 346 43196 78.6 123.2| da4
35 344 0 0 0.0 344 42940 80.0 124.7| da5
35 343 0 0 0.0 343 42812 80.7 124.5| da6
35 344 0 0 0.0 344 43051 79.8 123.9| da7
34 342 0 0 0.0 342 42796 80.6 124.4| da8
Now, some 10 hours and 2.5TB later, it look like that most of the time:
dT: 1.002s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 10 0 0 0.0 10 6 0.8 0.2| ad4
0 0 0 0 0.0 0 0 0.0 0.0| da0
4 13 0 0 0.0 13 8 550.4 178.5| da1
0 12 0 0 0.0 12 7 0.7 0.2| da2
0 11 0 0 0.0 11 7 0.7 0.2| da3
0 10 0 0 0.0 10 5 0.6 0.2| da4
0 11 0 0 0.0 11 6 0.9 0.3| da5
0 12 0 0 0.0 12 7 0.7 0.2| da6
0 11 0 0 0.0 11 7 0.7 0.2| da7
0 9 0 0 0.0 9 6 0.8 0.2| da8
da1 seems to be busy most of time and every few seconds all the other
devices write some data with nearly normal speed:
dT: 1.003s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
0 254 0 0 0.0 254 31331 34.9 35.4| ad4
0 0 0 0 0.0 0 0 0.0 0.0| da0
4 0 0 0 0.0 0 0 0.0 0.0| da1
0 254 0 0 0.0 254 31346 107.4 104.5| da2
0 256 0 0 0.0 256 31345 108.1 104.0| da3
0 255 0 0 0.0 255 31345 110.2 105.1| da4
35 200 0 0 0.0 200 24912 143.3 115.0| da5
35 211 0 0 0.0 211 26303 137.8 114.9| da6
35 210 0 0 0.0 210 26079 139.3 114.9| da7
35 209 0 0 0.0 209 25952 135.2 113.7| da8
Sometimes it even gets back to 'normal' behaviour, but never reaches
the speeds it once had:
dT: 1.002s w: 1.000s
L(q) ops/s r/s kBps ms/r w/s kBps ms/w %busy Name
35 274 0 0 0.0 274 34334 44.2 66.6| ad4
0 1166 1166 149243 0.1 0 0 0.0 14.3| da0
35 120 0 0 0.0 120 14717 94.4 64.5| da1
35 96 0 0 0.0 96 11665 113.9 64.3| da2
35 100 0 0 0.0 100 12288 98.7 63.9| da3
35 103 0 0 0.0 103 12496 93.4 59.4| da4
34 112 0 0 0.0 112 13694 106.1 67.4| da5
35 71 0 0 0.0 71 8596 115.3 66.8| da6
35 116 0 0 0.0 116 14205 101.7 67.3| da7
35 83 0 0 0.0 83 10066 112.2 65.9| da8
Syslog reports the following:
Oct 8 09:53:40 radium kernel: hptrr: start channel [0,0]
Oct 8 09:53:40 radium kernel: hptrr: channel [0,0] started successfully
Oct 8 09:57:44 radium kernel: hptrr: start channel [0,0]
Oct 8 09:57:45 radium kernel: hptrr: channel [0,0] started successfully
Oct 8 10:54:26 radium kernel: hptrr: start channel [0,0]
Oct 8 10:54:27 radium kernel: hptrr: channel [0,0] started successfully
Oct 8 11:10:29 radium kernel: hptrr: start channel [0,0]
Oct 8 11:10:30 radium kernel: hptrr: channel [0,0] started successfully
Oct 8 11:17:27 radium kernel: hptrr: start channel [0,0]
Oct 8 11:17:27 radium kernel: hptrr: channel [0,0] started successfully
Is this a problem of the hptrr device or is da1 failing?
Mit freundlichen Grüßen
Best regards,
Solon Lutz
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