Re: dm_mirror/dm_raid1 limitations ?.

Heinz Mauelshagen <heinzm@xxxxxxxxxx> · Mon, 26 Jan 2015 15:16:47 +0100



    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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