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High latency and disk errors with single/few disk high utilization

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281
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Public
Votes:
1
Category:
ontap-9
Specialty:
Perf
Last Updated:

Applies to

  • ONTAP 9
  • FAS systems

Issue

  • Slowness reported by multiple users and high disk utilization reported.
  • Multiple alerts/emails received reporting high latency from various volumes :
  • 7476 Sep 20 08:19:24 hdisk68    P SC_DISK_ERR7        path  0 path failure; READ(16)         
        (0000000102206B,00000200) command timeout
    7476 Sep 20 08:19:24 hdisk68    P SC_DISK_ERR7        path  0 path failure; READ(16)         
        (0000000102206B,00000200) command timeout
    Oct  5   08:21:42   Message forwarded from fb-lp-tsm01: root: ERRPT: DE3B8540
        1005082122 P H hdisk53 PATH HAS FAILED
    
 
2009370404 - Alert.png
 
 
2009370404 - Email alert1.png
 
  • statit command report high utilization on single disk.

Cluster::*> node run -node node1 -command statit -e
...
disk             ut%  xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs
/aggr1_node1/plex0/rg2:
0d.23.18          25  69.19    0.01   2.00  2033  31.50  60.67   175  37.69  51.19   169   0.00   ....     .   0.00   ....     .
0a.21.16          24  69.77    0.01   2.00  6964  32.11  59.56   194  37.66  51.18    90   0.00   ....     .   0.00   ....     .
0d.22.17          57 231.26  133.56   5.45  2075  26.91  29.41   573  70.79   9.87   641   0.00   ....     .   0.00   ....     .
0d.23.22          57 230.68  132.96   5.46  1845  26.83  29.56   646  70.90   9.74   604   0.00   ....     .   0.00   ....     .
0d.23.13          95 295.63  198.16   4.10  5472  26.83  29.76  1371  70.63   9.91  1975   0.01   ....     .   0.00   ....     .
0d.22.18          57 231.26  133.55   5.38  2080  26.84  29.60   561  70.86   9.73   634   0.00   ....     .   0.00   ....     .
0a.20.18          57 231.69  133.54   5.42  1846  27.00  29.46   647  71.15   9.78   608   0.00   ....     .   0.00   ....     .
0a.20.16          57 233.00  134.49   5.48  1879  27.08  30.09   634  71.43   9.83   594   0.00   ....     .   0.00   ....     .
0d.22.19          57 231.98  134.18   5.41  2099  26.87  29.67   567  70.93   9.87   646   0.00   ....     .   0.00   ....     .

 

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