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Sick disk causes performance impact

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Category:
ontap-9
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perf
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Applies to

  • ONTAP 9
  • ONTAP 8
  • FAS
  • AFF

Issue

  • High FlexVol latency observed.
  • High latency may lead to NFS disconnections in some scenarios.
  • Running qos statistics volume latency show command shows primary delay under disk column.
  • A single drive exhibiting significantly higher utilization and latency than other drives in the RAID group
    • this can be validated with the node shell statit command
cluster1::> node run -node local -command "priv set -q advanced; statit -e"
...
disk             ut%  xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs greads--chain-usecs gwrites-chain-usecs
/aggr1/plex0/rg0:
0a.10.10          31  93.15    0.00   ....     .  54.89  26.94   590  38.26  38.85   155   0.00   ....     .   0.00   ....     .
0a.10.1           33  93.98    0.00   ....     .  55.75  26.55   630  38.23  38.83   183   0.00   ....     .   0.00   ....     .
0a.10.2           19 118.78    9.53   3.50  8515  56.77  10.57   291  52.49   9.60   543   0.00   ....     .   0.00   ....     .
0a.10.3           21 120.65   10.11   3.80  8440  58.10  10.88   362  52.43   9.50   566   0.00   ....     .   0.00   ....     .
0a.10.4           20 119.76    9.21   3.27  9108  57.79  10.54   314  52.76   9.44   552   0.00   ....     .   0.00   ....     .
0a.10.5          100 121.62   10.52   3.22 19375  58.78  10.20  7699  52.32   9.79  4831   0.00   ....     .   0.00   ....     .
0a.10.6           18 119.96    9.57   3.33  8727  57.97  10.73   216  52.42   9.64   541   0.00   ....     .   0.00   ....     .
0a.10.7           18 119.06    9.01   3.53  8786  57.71  10.57   223  52.34   9.56   535   0.00   ....     .   0.00   ....     .
0a.10.8           18 121.28    9.75   3.76  8179  59.29  10.89   235  52.24   9.72   544   0.00   ....     .   0.00   ....     .
0a.10.9           19 121.30   10.90   3.47  8249  58.15  11.07   217  52.26   9.87   526   0.00   ....     .   0.00   ....     .
  • EMS Logs may report several errors and aborts on the Disk , prior to marking it as failure.
scsi_cmdblk_strthr_admin: scsi.cmd.retrySuccess:debug]: Disk device 3b.51.1L2: request successful after retry #1/#0: 
 cdb 0x28:3b468100:0008 (24080).
scsi_cmdblk_strthr_admin: scsi.cmd.retrySuccess:debug]: Disk device 3b.51.1L2: request successful after retry #1/#0:
 cdb 0x28:3b4681a8:0008 (24081).
scsi_cmdblk_strthr_admin: scsi.cmd.retrySuccess:debug]: Disk device 3b.51.1L2: request successful after retry #1/#0:
 cdb 0x88:000000020ab11b00:00000008 (24928).
scsi_cmdblk_strthr_admin: scsi.cmd.retrySuccess:debug]: Disk device 3b.51.1L2: request successful after retry #1/#0:
 cdb 0x88:00000002b7ff0d00:00000038 (24619).
config_thread: raid.disk.delete.drl:debug]: aggregate Disk /aggr01_node02/plex0/rg0/3b.51.1L1 Shelf 51 Bay 1 
 [NETAPP X481_SMKRE06TSDB NA03] S/N [S4D12BT0] UID [5000C500:8CE40C44:00000000:00000000:00000000:00000000:00000000:
 00000000:00000000:00000000] Deleting dirty region log DRL_1.
  wafl.cp.toolong:error]: Aggregate fas_01_DATA_AGGR experienced a long CP...

wafl_exempt08: wafl.cp.toolong:error]: Aggregate fas_01_DATA_AGGR experienced a long CP.

 

 

 

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