DataDirect Networks S2A9550, User Manual

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M a n a g i n g t h e S 2 A 9 5 5 0
D a t a D i r e c t N e t w o r k s S 2 A 9 5 5 0 U s e r G u i d e
61
The
STATS TIERDELAY=<tier>
command will display a histogram of the time it takes for the disk I/O
request to complete for all the disks in the specified
(Figure 3-36)
. If no tier is specified, all valid tiers
will be displayed. The histogram is displayed in 100 msec intervals.
The
STATS DISK
command will display a histogram of which disks in the system have taken an
unusually long time to complete an I/O request
(Figure 3-37)
. The count is incremented for a disk if the
disk takes longer than the other disks to finish an I/O request. This command is used to determine if
a disk in the array is slowing down the system performance. Normally all the disks in a tier should
have similar counts. A disk with a significantly higher count indicates that the disk may be slower or
it may have problems.
Tier 1 Delay Statistics
Time
S2A [1]: stats tierdelay
Disk Channels
seconds A
Figure 3-36 Tier Delay Statistics Screen
B C D E F G H P S
0.1 3407b 33108 339bd 3409f 572c5 34c0d 33640 30603 3391a 7ed5d
0.2 480f4 4885c 4866a 48190 27b83 47910 484cc 4acc1 48196 21e
0.3 2ca6 33d8 2def 2c1f 127 2928 324f 3a63 32a7 0
0.4 d1 1bc cd c7 0 c0 185 10f 176 0
0.5 2c 2b 26 12 0 23 27 33 36 0
0.6 13 1b 14 12 0 e 13 1d 1d 0
0.7 13 15 7 a 6 e 15 28 17 0
1.8 0 0 0 0 0 0 0 0 0 0
1.9 0 0 0 0 0 0 0 0 0 0
2.0 0 0 0 0 0 0 0 0 0 0
....
Hit enter to continue, ‘e’ to escape:
Delayed Disk Command Counts
S2A [1]: stats disk
Figure 3-37 Host Command Offsets Screen
0 A B C D E F G H P S
1 0 0 0 0 0 0 0 0 0 0
2 3C5 392 34D 4DC 37C 361 3BD 3EE 48B 0
3 0 0 0 0 0 0 0 0 0 0
4 421 7F7 37F 396 7DB 3D2 5B6 3C6 55E 0
5 0 0 0 0 0 0 0 0 0 0
6 338 37E 37F 36C 30F 38B 8DF 5D1 58E 0
7 0 0 0 0 0 0 0 0 0 0
8 0 0 0 0 0 0 0 0 0 0
9 3F1 347 6D4 7DD 929 357 3B4 4D4 5FA 0
10 78C 3B3 412 2ED 642 40A 788 33B 43E 0
11 465 3EE 739 34C 2FC A2F 358 310 382 0
12 0 0 0 0 0 0 0 0 0 0
Disks in the same tier should have similar results.