APC 15000 RAID manual 37Host Command Offsets Screen

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.

15000 [1]: stats disk
			Delayed Disk Command Counts
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.

Figure 3–37Host Command Offsets Screen

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