iscsi and cache pool

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Yeah, the features are new from January or something so you need a
very new kernel to support it. There are no options to set.
But in general I wouldn't use krbd if you can use librbd instead; it's
easier to update and more featureful!
-Greg
Software Engineer #42 @ http://inktank.com | http://ceph.com


On Tue, Jul 1, 2014 at 5:44 PM, ????????? ??????? <v1t83 at yandex.ru> wrote:
> Hi!
>
> There is some option in the kernel which must be included, or just upgrade
> to the latest version of the kernel? I use 3.13.0-24
>
> Thanks
>
> 01.07.2014, 20:17, "Gregory Farnum" <greg at inktank.com>:
>
> It looks like you're using a kernel RBD mount in the second case? I imagine
> your kernel doesn't support caching pools and you'd need to upgrade for it
> to work.
> -Greg
>
> On Tuesday, July 1, 2014, ????????? ??????? <v1t83 at yandex.ru> wrote:
>
> Good day!
> I have server with Ubunu 14.04 and installed ceph firefly. Configured
> main_pool (2 osd) and ssd_pool (1 ssd osd). I want use ssd_pool as cache
> pool for main_pool
>
>   ceph osd tier add main_pool ssd_pool
>   ceph osd tier cache-mode ssd_pool writeback
>   ceph osd tier set-overlay main_pool ssd_pool
>
>   ceph osd pool set ssd_pool hit_set_type bloom
>   ceph osd pool set ssd_pool hit_set_count 1
>   ceph osd pool set ssd_pool hit_set_period 600
>   ceph osd pool set ssd_pool target_max_bytes 100000000000
>
>  If use tgt as:
>  tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 --bstype rbd
> --backing-store main_pool/store_main --bsopts "conf=/etc/ceph/ceph.conf"
>  and then connected from iscsi initiator to this Lun1, i see that ssd_pool
> is used as cache (i see through iostat -x 1) but slow speed
>
>  If use tgt as (or other sush as scst, iscsitarget):
>  tgtadm --lld iscsi --mode logicalunit --op new --tid 1 --lun 1 -b /dev/rbd1
> (where rbd1=main_pool/store_main)
>  and then connected from iscsi initiator to this Lun1, i see that ssd_pool
> is not used, that write through to 2 osd
>
>  Help me, anyone work this iscsi and cache pool?
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>
>
>
> --
> Software Engineer #42 @ http://inktank.com | http://ceph.com


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