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Performance impact due to low aggregate free space

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Category:
ontap-9
Specialty:
perf
Last Updated:

Applies to

ONTAP 9

Issue

  • Users or applications are having perfomance issues and ONTAP shows higher latency than normal
  • To check the amount of free space available within an aggregate, run the aggr show-space cluster shell command. Aggregate free space is low, over 90% used space

Example:

cluster::> aggr show-space -aggregate <aggr_name> 
...
                Physical Used Percentage: 91%  
 

  • Aggregate disk statistics detailing cp-read and write operations can be seen from statit on the node shell of a CDOT controller or 7-mode controller with higher cp reads

Example:
::> set advanced
::*> node run -node node_1 statit -b
/* wait 60s */
::*> node run -node node_1 statit -e
...
disk             ut%  xfers  ureads--chain-usecs writes--chain-usecs cpreads-chain-usecs
/aggr1/plex0/rg0:
9d.01.0           36  99.01    0.00   ....     .  47.50  62.96   179  51.51  57.25    81 
9d.02.0           34 100.39    0.00   ....     .  48.92  61.20   162  51.48  57.25    68 
1c.03.0           56 206.74   99.04   3.22  2035  40.75  40.53   315  66.95  14.92   338 
9d.00.0           73 206.66  100.15   3.22  2993  40.26  40.76  1004  66.25  14.80   640 
9d.01.1           73 208.33  101.16   3.31  2918  40.38  40.48  1021  66.79  14.91   643 

  • EMS Log entry may be present:  
    [wafl.vol.full:notice]: Insufficient space on volume Cluster1_vol@vserver:0cc56ede-1c58-11e6-XXXX-00a09893e1f7
 to perform operation. 8.00KB was requested but only 1.00KB was available.

 

 

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