> What problem are you actually
> trying to solve with that information?
I suspect that the mds_cache_memory_limit we set (~60GB) is
sub-optimal and I am wondering if we would be better off if,
say, we halved the cache limits and doubled the number of
MDSes. I am looking for metrics to quantify this, and
cache_hit_rate and others in "dump loads" seem relevant.
Vlad
On 9/2/22 16:59, Gregory Farnum wrote:
On Sun, Aug 28, 2022 at 12:19 PM Vladimir Brik
<vladimir.brik@xxxxxxxxxxxxxxxx> wrote:
Hello
Is there a way to query or get an approximate value of an
MDS's cache hit ratio without using "dump loads" command
(which seems to be a relatively expensive operation) for
monitoring and such?
Unfortunately, I'm not seeing one. What problem are you actually
trying to solve with that information? The expensive part of that
command should be dumping all the directories in cache, so a new admin
command to dump just the cache hit rate and related statistics should
be a pretty simple feature — PRs welcome! ;)
-Greg
Vlad
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