[dm-devel] dm_mirror/dm_raid1 limitations ?.

[Heinz Mauelshagen]

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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