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Why does a single disk have higher utilization that the others in the same raid group?

  1. Last updated
    Jun 20, 2024
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Category:
ontap-9
Specialty:
perf
Last Updated:
6/20/2024, 7:32:10 PM

Applies to

  • ONTAP 9
  • Advanced Disk Paritioning (ADP)

Answer

  • Statistics disks show shows higher utilization when a disk is partitioned and shows combined utilization of both partitions.
  • Example: Disk 1.0.0 shows 91% busy compared to other disks in the raid group.
Cluster::*> statistics disk show -node nodename -sort-key disk_busy
Cluster : 5/15/2024 10:10:10

                     *Busy Total Read Write    Read   Write Latency
 Disk           Node   (%)   Ops  Ops   Ops   (Bps)   (Bps)    (us)
----- -------------- ----- ----- ---- ----- ------- ------- -------
1.0.0 nodename          91   208  193    14 7242752 3432448   21008
1.0.3 nodename          48   231  212    18 8062976 4131840   21242
1.0.11
      nodename          48   225  208    16 6968320 3825664   19085
1.0.5 nodename          47   235  216    19 7627776 4260864   20330
1.0.13
      nodename          47   216  199    16 7601152 3934208   18361
1.0.9 nodename          46   216  201    14 6908928 3716096   19572

Additional Information

NA

 

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