[dm-devel] dm_mirror/dm_raid1 limitations ?.

[suresh.babu.kandukuru at oracle.com]

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 at redhat.com> 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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> <Untitled.txt>
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