<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Heinzm,thanks for the quick reply.. We are using dmestup create mirror ..as we want to do that on physical San lun (block devices) ... Not the one ( lv create ) you mentioned below.. Is there any advantage going with logical volume approach lvcreate -type </div><div><br></div><div>/Suresh<br><br>Sent from my iPhone</div><div><br>On Jan 26, 2015, at 7:46 PM, Heinz Mauelshagen <<a href="mailto:heinzm@redhat.com">heinzm@redhat.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<div class="moz-cite-prefix">On 01/26/2015 02:51 PM, Suresh Babu
Kandukuru wrote:<br>
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<p class="MsoNormal">Use case is : Two luns are mapped from
storage array to linux host which are in same SAN fabric . we
want to create a mirror on the linux host with these two luns
and let host use that mirror lun . basic tests suggest that
dm_mirror working fine . when we have any intermittent path
issues with between host and san array , host i/o just freeze
, never returns back even after the path is online. <o:p></o:p></p>
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Hard to tell what's happening without any kernel log.<br>
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<p class="MsoNormal">Is dm_mirror viable solution here ?. Can
you point me any link which gives the limitations of dm_mirror
? . another alternate solutions you propose here ?. Thanks in
advance .</p>
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We've switched the default away from "mirror" to "raid1" in order to
take advantage of th MD runtime.<br>
Have you tested "lvcreate --type raid1 ..." yet?<br>
Please do.<br>
<br>
Regards,<br>
Heinz<br>
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<p class="MsoNormal">Thanks<o:p></o:p></p>
<p class="MsoNormal">/Suresh<o:p></o:p></p>
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