Re: Cache Tiering Question

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I was not able to trigger eviction using percentage settings. I run
the hot pool into "cluster is full" and the eviction did not start. As
an option a threshold on # of objects did trigger an eviction.
Unfortunately it stalled all the writes to the hot pool until the
eviction was complete.



On Thu, Oct 15, 2015 at 2:06 PM, Robert LeBlanc <robert@xxxxxxxxxxxxx> wrote:
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> ceph df (ceph version 0.94.3-252-g629b631
> (629b631488f044150422371ac77dfc005f3de1bc)) is showing some odd
> results:
>
> root@nodez:~# ceph df
> GLOBAL:
>     SIZE       AVAIL      RAW USED     %RAW USED
>     24518G     21670G        1602G          6.53
> POOLS:
>     NAME         ID     USED      %USED     MAX AVAIL     OBJECTS
>     rbd          0      2723G     11.11         6380G     1115793
>     ssd-pool     2          0         0          732G           1
>
> The rbd pool is showing 11.11% used, but if you calculate the numbers
> there it is 2723/6380=42.68%.
>
> Will this cause problems with the relative cache tier settings? Do I
> need to set the percentage based on what Ceph is reporting here?
>
> Thanks,
> - ----------------
> Robert LeBlanc
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