[ovirt-users] ssd cache

[Ernest Beinrohr]

Dňa 09.12.2014 o 03:57 yao xu napísal(a):
> do you use iscsi ?
>

Yes, the storage present itselft as iscsi to ovirt. The tgtd iscsi 
target which runs on rhel7 does NOT know about the cache, it simply 
shares an LVM block device. I created the cache using this tutorial:

http://blog.kylemanna.com/linux/2013/06/30/ssd-caching-using-dmcache-tutorial/ 
(or this, but you need a subscrition: 
https://access.redhat.com/solutions/912953 )

tgtd.conf:

<target iqn.2014-05.sk.axonpro.sk:BigCachedPool>
     scsi_id STORAGE_BigCachedPool
     vendor_id AXONPRO
     product_id scsi-target-utils
     scsi_sn 42fbb7c1-99d4-4247-a55b-222e5abe13aa
     backing-store /dev/rhel/BigCachedPool
     incominguser ovirt xxxx
</target>

lvs:

   LV             VG   Attr       LSize   Pool Origin                
Data%  Move Log Cpy%Sync Convert
   BigCachedPool  rhel Cwi-aoC---  21,00t lv_cache [BigCachedPool_corig]
   lv_cache       rhel Cwi-a-C--- 100,00g

-- 
Ernest Beinrohr, AXON PRO
Ing <http://www.beinrohr.sk/ing.php>, RHCE 
<http://www.beinrohr.sk/rhce.php>, RHCVA 
<http://www.beinrohr.sk/rhce.php>, LPIC 
<http://www.beinrohr.sk/lpic.php>, VCA <http://www.beinrohr.sk/vca.php>,
+421-2-62410360 +421-903-482603
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