Re: [ovirt-users] ssd cache

9 Dec 2014

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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-tutoria... 
(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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    <div class="moz-cite-prefix">Dňa 09.12.2014 o 03:57 yao xu
      napísal(a):<br>
    </div>
    <blockquote
cite="mid:CAFEhV74MugY5YCTTaBfsMbU_0B6gWvU5zDeh9bGRnukvJscAFw@mail.gmail.com"
      type="cite">
      <div dir="ltr">do you use iscsi ? </div>
      <br>
    </blockquote>
    <br>
    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:
    <br>
    <br>
    <a class="moz-txt-link-freetext" href="http://blog.kylemanna.com/linux/2013/06/30/ssd-caching-using-dmcache-tutorial/">http://blog.kylemanna.com/linux/2013/06/30/ssd-caching-using-dmcache-tutorial/</a>
    (or this, but you need a subscrition:
    <a class="moz-txt-link-freetext" href="https://access.redhat.com/solutions/912953">https://access.redhat.com/solutions/912953</a> )<br>
    <br>
    tgtd.conf:<br>
    <br>
    <tt><target iqn.2014-05.sk.axonpro.sk:BigCachedPool></tt><tt><br>
    </tt><tt>    scsi_id STORAGE_BigCachedPool</tt><tt><br>
    </tt><tt>    vendor_id AXONPRO</tt><tt><br>
    </tt><tt>    product_id scsi-target-utils</tt><tt><br>
    </tt><tt>    scsi_sn 42fbb7c1-99d4-4247-a55b-222e5abe13aa</tt><tt><br>
    </tt><tt>    backing-store /dev/rhel/BigCachedPool</tt><tt><br>
    </tt><tt>    incominguser ovirt xxxx</tt><tt><br>
    </tt><tt></target></tt><tt><br>
    </tt><br>
    lvs:<br>
    <br>
    <tt>  LV             VG   Attr       LSize   Pool    
      Origin                Data%  Move Log Cpy%Sync Convert</tt><tt><br>
    </tt><tt>  BigCachedPool  rhel Cwi-aoC---  21,00t lv_cache
      [BigCachedPool_corig]</tt><tt><br>
    </tt><tt>  lv_cache       rhel Cwi-a-C--- 100,00g</tt><br>
    <br>
    <div class="moz-signature">-- <br>
      <div id="oernii_footer" style="color: gray;">
        <span style="font-family: Lucida Console, Luxi Mono, Courier,
          monospace; font-size: 90%;">
          Ernest Beinrohr, AXON PRO<br>
          <a style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/ing.php">Ing</a>, <a
            style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/rhce.php">RHCE</a>, <a
            style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/rhce.php">RHCVA</a>, <a
            style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/lpic.php">LPIC</a>, <a
            style="text-decoration: none; color: gray;"
            href="http://www.beinrohr.sk/vca.php">VCA</a>, <br>
          +421-2-62410360 +421-903-482603
          <br>
        </span> </div>
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Ernest Beinrohr

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