HPE EVA Storage

disk performance and cahceinfo

 
brandani
Occasional Contributor

disk performance and cahceinfo

Investigating bad IO performance , I connect the msa1000 CLI and run command show disk, this is the result:

CLI> show disks
box,bay bus,ID Size Speed Units
Disk101 1,01 0,00 146.8 GB 160 MB/s 0, 1, 2, 5
Disk102 1,02 0,01 146.8 GB 160 MB/s 3
Disk103 1,03 0,02 146.8 GB 160 MB/s 4
Disk104 1,04 0,03 146.8 GB 160 MB/s none
Disk108 1,08 1,00 146.8 GB 160 MB/s 0, 1, 2, 5
Disk109 1,09 1,01 146.8 GB 160 MB/s 3
Disk110 1,10 1,02 146.8 GB 160 MB/s 4 (spare)
Disk111 1,11 1,03 146.8 GB 160 MB/s none
Disk201 2,01 2,00 146.8 GB 160 MB/s 0, 1, 2, 5
Disk202 2,02 2,01 146.8 GB 160 MB/s 3 (spare)
Disk203 2,03 2,02 146.8 GB 160 MB/s 4
Disk204 2,04 2,03 146.8 GB 160 MB/s none
Disk208 2,08 3,00 146.8 GB 160 MB/s 0, 1, 2, 5 (spare)
Disk209 2,09 3,01 146.8 GB 160 MB/s 3
Disk210 2,10 3,02 146.8 GB 10 MB/s 4
Disk211 2,11 3,03 146.8 GB 160 MB/s none


In particular Disk210 show 10MB/s respect to others disk which are 160MB/s.
Does this evidence aproblem on Disk210 and could be the reason of our IO bad performance?

moreover the show cacheinfo:

CLI> show cacheinfo
00030681 LINES: NOT SET
00000015 LINES: LINE_LOCK
00000002 LINES: HOST_READ_LOCK
Minimum DMA CDB count since last check: 981

we have 250Mb cache, what does it mean the NOT SET result?

Any comment higly appreciated

Silvio Brandani