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We need a custom lvmstat that can gather MWC stats, that would would work like this:
To enable mwcc stats:
lvmstat -v <vgname> -me
To disable mwcc stats:
lvmstat -v <vgname> -md
To clear mwcc stats:
lvmstat -v <vgname> -mC
To query mwcc stats:
lvmstat -v <vgname> -m
or
lvmstat -v <vgname> -m <interval> <counter>
exemple:
# lvmstat -v oradatavg -m 10 5
TIME IOCNT FULLCNT INFLT_CNT
11:14:14 125862779 37641358 83524086
11:14:24 1405081 660648 687673
11:14:34 890454 235005 630771
11:14:44 897578 251068 603337
11:14:54 951559 302345 616823
IOCNT - Total number of requests.
FULLCNT - Number of times the request is in hold because of cache full .
INFLT_CNT - Number of times the request is in hold because of the cache write is in progress
Idea priority | High |
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