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Slow backups due to high latency on LUNs

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Category:
ontap-9
Specialty:
san
Last Updated:

Applies to

  • SAN
  • ONTAP 9
  • Red Hat Enterprise Linux (RHEL) 6.7

Issue

  • Latency on the LUNs show peaking to 50ms on during backups
  • Volume/LUN on one node is accessed by its partner node

clipboard_e67be68a54902778558aa27044ee57a60.png

  • multipath -ll from Linux host shows '0' for a hardware handler and paths are not grouped by priority

[root@linux ~]# multipath -ll
mpathaf (3600a09803831457544245248xxxxxxxx) dm-8 NETAPP,LUN C-Mode
size=500G features='0' hwhandler='0' wp=rw
|-+- policy='round-robin 0' prio=1 status=active
| `- 12:0:0:8 sdh  8:112  active ready running
|-+- policy='round-robin 0' prio=1 status=enabled
| `- 12:0:1:8 sdo  8:224  active ready running
|-+- policy='round-robin 0' prio=1 status=enabled
| `- 12:0:2:8 sdv  65:80  active ready running
`-+- policy='round-robin 0' prio=1 status=enabled
  `- 12:0:3:8 sdac 65:192 active ready running

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