APC SGI 15000 RAID - Manual (Page 78)

64 007-5510-002
STATS DISK displays a histogram of the disks in the system that have taken an unusually long time to
complete an I/O request (Figure 3–37). The count is incremented for a disk if that 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 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 than the other disks or have problems.
Figure 3–37 Host Command Offsets Screen
Delayed Disk Command Counts
15000 [1]: stats disk
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.