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Lower than expected performance while utilizing a single volume

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Category:
ontap-9
Specialty:
perf
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Applies to

ONTAP 9

Issue

  • Lower than expected performance while utilizing a single volume
    • Latency or slowness is seen in any operating system (Windows, Mac OS, Linux, ESX, etc.) or application (Office, Oracle, ESXi, Hyper-V, etc.)
  • High latency on a volume with low CPU utilization.

Example:

  • The output of command  sysstat shows a low Avg CPU utilization
  • The output of wafltop only shows the high i/o on vol1
  • vol1 takes the majority of Ops
  • No high latency from other volumes
CPU Utilization Percent
                                  Application      Total     STRIPE LAST_STRIPE STRIPEGROUP  VOL_LOG VOL_VBN_RANGE VBN_RANGE  VOL_VBN        VBN        VOL AGGR_VBN_RANGE AGGR_VBN     AGGR     SERIAL   XCleaner
                                  -----------   --------   --------   --------   --------   --------   --------   --------   --------   --------   --------   --------   --------   --------   --------    -------
aggr1:vol1:cifs:WAFL_SPINNP_WRITE:         54          0          0          0          0          0          0          0          0          0         29          0          0          0         14
aggr1:vol2:cifs:WAFL_SPINNP_WRITE:          2          2          0          0          0          0          0          0          0          0          0          0          0          0          0
aggr1:vol3:cifs:WAFL_SPINNP_WRITE:          1          1          0          0          0          0          0          0          0          0          0          0          0          0          0
aggr1:vol4:cifs:WAFL_SPINNP_WRITE:          1          1          0          0          0          0          0          0          0          0          0          0          0          0          0
...
I/O utilization
                                   ---------MB Read---------- ---------MB Write--------- --------IOs Read---------- --------IOs Write---------
                                   Application MB Total Standard ExtCache  Hybrid  Standard ExtCache  Hybrid  Standard ExtCache  Hybrid  Standard ExtCache  Hybrid
                                   ----------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- -------- --------
aggr1:vol1:cifs:WAFL_SPINNP_WRITE:        2558        9        0        0     2549        0        0        0        0        0     1287        0        0 
aggr1:vol2:cifs:WAFL_SPINNP_WRITE:          12        0        0        0       12        0        0        0        0        0        3        0        0 
aggr1:vol3:cifs:WAFL_SPINNP_WRITE:           7        0        0        0        7        0        0        0        0        0        1        0        0 
aggr1:vol4:cifs:WAFL_SPINNP_WRITE:           5        0        0        0        5        0        0        0        0        0        1        0        0 

Cluster::> node run -node node1 -command sysstat -x 1
 CPU    NFS   CIFS   HTTP   Total     Net   kB/s    Disk   kB/s    Tape   kB/s   Cache  Cache    CP           CP_Ty               CP_Ph       Disk   OTHER    FCP  iSCSI     FCP   kB/s   iSCSI   kB/s
                                       in    out    read  write    read  write     age    hit  time  [T--H--F--N--B--O--#--:]  [n--v--p--f]   util                            in    out      in    out
 13%    261      3      0    2927  222768 258592     104       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      1%    2663      0      0       0      0       0      0
 15%    403      6      0    3040  255451 255197     116       0       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%    2631      0      0       0      0       0      0
  5%    348     10      0     811    6094   9894     232      24       0      0    12    100%    0%   0--0--0--0--0--0--0--0    0--0--0--0      2%     453      0      0       0      0       0      0

 

 

 

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