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July 2007, Week 2

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Subject:
3000/A500/200 with mirroring (at least) issue...
From:
Jeff Kell <[log in to unmask]>
Reply To:
Jeff Kell <[log in to unmask]>
Date:
Mon, 9 Jul 2007 08:32:37 -0400
Content-Type:
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We have an unhappy 3000/A500/200-20 this morning.  One of the mirrors has split/disabled, but the problem seems to go deeper:

> (MANAGER.SYS)# dstat all
>  LDEV-TYPE            STATUS    VOLUME           VOLUME SET - GEN
>  ----------           -------   ----------------------------------
>     1-ST336753LC      MASTER    MEMBER1          MPEXL_SYSTEM_VOLUME_SET-0
>     2-ST336753LC      MEMBER    MEMBER2          MPEXL_SYSTEM_VOLUME_SET-0
>    30-MAS3367NC       MASTER-MD MEMBER1          PRODUCTION-0
>    31-MAS3367NC       MEMBER-MD MEMBER2          PRODUCTION-0
>    32-MAS3367NC       MASTER-MD MEMBER1          DEVELOPMENT-0
>    33-MAS3367NC       MEMBER-MD MEMBER2          DEVELOPMENT-0
>    34-MAS3367NC       MASTER-MD MEMBER1          WORKSPACE-0
> 8:28/22/MIRRORED VOLUME DISABLED ON LDEV #44
>    40-        BUSY    MASTER-MD MEMBER1          PRODUCTION-0
>    41-        BUSY    MEMBER-MD MEMBER2          PRODUCTION-0
>    42-        BUSY    MASTER-MD MEMBER1          DEVELOPMENT-0
>    43-        BUSY    MEMBER-MD MEMBER2          DEVELOPMENT-0
>    44-MAS3367NC    *DISABLED-MD MEMBER1          WORKSPACE-0

The 3x drives are master members of mirror pairs and the 4x drives should be the mirrors themselves.

44 has clearly split from the mirror, but what's with the "BUSY" state of the other volumes?

Is this a channel problem?  (3x drives are on a separate channel from the 4x drives).

Not sure how to proceed from here (never seen a "BUSY" state from DSTAT).

Ideas?  Clues?  Condolences?  :-)

Jeff

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