Disk failure

[Doug Hughes]

>
>Hello
>
>After a disk failure, the hot-relocation splitted a subdisk of a stripped and
>mirrored volume into two subdisks with different sizes on two different physical
>disks.
>
>  Original-Layout                         Layout after Failure
>+----------------------------------+    +----------------------------------+
>| +-------------+  +-------------+ |    | +-------------+  +-------------+ |
>| |+-----------+|  |+-----------+| |    | |+------+----+|  |+-----------+| |
>| || A-01      ||  || C-01      || |    | || F-09 |G-10||  || C-01      || |
>| |+-----------+|  |+-----------+| |    | |+------+----+|  |+-----------+| |
>| || B-01      ||  || D-01      || |    | || B-01      ||  || D-01      || |
>| |+-----------+|  |+-----------+| |    | |+-----------+|  |+-----------+| |
>| |  vol01-01   |  |  vol01-02   | |    | |  vol01-01   |  |  vol01-02   | |
>| +-------------+  +-------------+ |    | +-------------+  +-------------+ |
>|                                  |    |                                  |
>|                                  |    |                                  |
>|               vol01              |    |               vol01              |
>+----------------------------------+    +----------------------------------+
>
>
>                  +-------------------------------------------------------------+
>                  |                                                             |
> Physical-Disk A  |            Physical-Disk F                Physical-Disk G   |
>+--------------+  |           +---------+----+               +--------------+   |
>| A-01         | -+-------->  | F-09    |    |               |              |   |
>|--------------|              |---------+----|               |---------+----|   |
>|              |              |              |               |         |G-10| <-+
>|--------------|              |--------------|               |---------+----|
>|              |              |              |               |              |
>|--------------|              |--------------|               |--------------|
>|              |              |              |               |              |
>+--------------+              +--------------+               +--------------+
> failed disk                  
>
>How can I move the two subdisks F-09 and G-10 back to the original subdisk A-01
>after replacing the failed disk? I like to have the original layout.
>
>How can I do it with the commandline command.
>How can I do it with the graphical interface "vxva".
>

What you need to do is first: get your current vxprint output
vxprint -g <diskgroup> -Gsdt 

now, look for F-09 and G-10 in this output
get the size from F-09 and G-10 (let's call them fsize and gsize)

vxmake -g <diskgroup> sd A-01 dm_name=A dm_offset=0 len=fsize
vxmake -g <diskgroup> sd A-02 dm_name=A dm_offset=fsize len=gsize
vxsd -g <diskgroup> -o rm mv F-09 A-01
vxsd -g <diskgroup> -o rm mv G-10 A-02
vxsd -g <diskgroup> join A-01 A-02 A-01

In fact, we had a disk failure in an SSA just last night and I had
to do something very similar to this.
You can do this on a live file system too. It works just fine. Don't
worry about data integrity, it'll be fine.


As for vxva, You should be able to just drag and drop the subdisks onto
the A VMdisk and then do a join operation in the GUI. You may have to do
a lot of scrollbarring up and down to do this, or you could construct
your own 'view' in the GUI, but that's outside the scope of this example. ;)


--
____________________________________________________________________________
Doug Hughes					Engineering Network Services
System/Net Admin  				Auburn University
			doug@eng.auburn.edu