On 01/26/2015 04:34 PM, suresh.babu.kandukuru@xxxxxxxxxx wrote:
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
One of LVM features is monitoring of mirror/raid LVs and
removing/replacing any missing legs.
Using dmsetup directly, you have to do this manually.
/Suresh
Sent from my iPhone
On Jan 26, 2015, at 7:46 PM, Heinz Mauelshagen <heinzm@xxxxxxxxxx>
wrote:
On 01/26/2015 02:51 PM, Suresh Babu Kandukuru wrote: 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.
Hard to tell what's happening without any kernel log.
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 .
We've switched the default away from "mirror" to "raid1" in order
to take advantage of th MD runtime. Have you tested "lvcreate
--type raid1 ..." yet? Please do.
Regards, Heinz
Thanks /Suresh
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