Re: Cache Tier Statistics

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Hi Jean-Charles,

Thanks for your response, I have found the following using "ceph daemon osd.{id} perf dump".

      "tier_promote": 1425,
      "tier_flush": 0,
      "tier_flush_fail": 0,
      "tier_try_flush": 216,
      "tier_try_flush_fail": 21,
      "tier_evict": 1413,
      "tier_whiteout": 201,
      "tier_dirty": 671,
      "tier_clean": 216,
      "tier_delay": 16,

I'm guessing the tier_promote should increase every time there is a cache miss? If this is the case then I simply need to add this value from every OSD and divide by total reads to work out the percentage hit rate.

Nick

From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Jean-Charles Lopez
Sent: 09 November 2014 01:43
To: Nick Fisk
Cc: ceph-users@xxxxxxxxxxxxxx
Subject: Re:  Cache Tier Statistics

Hi Nick

If my brain doesn't fail me you can try
ceph daemon osd.{id} perf dump
ceph report (not 100% sure if cache stats are in

Rgds
JC


On Saturday, November 8, 2014, Nick Fisk <nick@xxxxxxxxxx> wrote:
Hi,
 
Does anyone know if there any statistics available specific to the cache tier functionality, I’m thinking along the lines of cache hit ratios? Or should I be pulling out the Read statistics for backing+cache pools and assuming that if a read happens from the backing pool it was a miss and then calculating it from that?
 
Thanks,
Nick




-- 
Sent while moving




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