Re: dm_mirror/dm_raid1 limitations ?.

["suresh.babu.kandukuru@xxxxxxxxxx" <suresh.babu.kandukuru@xxxxxxxxxx>]

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  

/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

--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel

<Untitled.txt>

--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel