Re: Unload/Reload

[DrFranken <midrange@xxxxxxxxxxxx>]

> My boss wants to replace the four 4327-074's with 4329's  (281GB's instead
> of 70GB's).

Wellll that's gonna be a problem.  You see the 074s are the ones that 
contain the RAID stripe so when you pull those the 070's will be 
unprotected. Then you'll have to re-start RAID on them after you format 
them and you'll get four of the 070s to step up and become replacement 
074's. :-)

So no matter what yer doin' you will be removing four 070s for a total 
of 282GB removed from the ASP.  By my math, when you do that you will 
have 26GB of stuff laying on the floor. In other words if you did try to 
remove four of the 070s concurrently the system would stop you from 
trying.  If you could get rid of another 50GB of stuff (or so for a 
cushion) temporarily this could all be done with NO downtime (assuming i 
7.1).

Select four drives that are 070s.
STRASPBAL and drain them to near zero.
Use SST to remove them concurrently from the system.
Use SST to exclude them from RAID.
Use SST to concurrently remove them.
Use SST to concurrently install the new disks.
Use SST to Initialize and format the new disks.
Use SST to start RAID on the new disks. (Will take only seconds if you 
did previous step)
Use SST to add AND BALANCE them to the ASP.

Don't forget to put the 50GB of stuff back.

Also it has been my experience that having drives of THREE different 
sizes (or worse) is poor for performance. You would have 70/140/280 and 
thus the 280s will work twice as hard as the 140s and four times as hard 
as the 70s. Rather than 280s I would do 140s until all 70s were gone, 
then go to 280s in the future if needed.

    - Larry "DrFranken" Bolhuis.

By my math you

On 9/4/2012 10:27 AM, rob@xxxxxxxxx wrote:
> This lpar's pretty tight on disk, let me scratch that.  That's an
> "opinion".  Let me throw out numbers.
>
>                 Size    %
> Unit  Type      (M)  Used
>     1  4328   141129  81.3
>     2  4328   105847  81.3
>     3  4328   105847  81.3
>     4  4328   105847  81.3
>     5  4328   105847  81.3
>     6  4328   141129  81.3
>     7  4327    52923  86.2
>     8  4327    52923  86.2
>     9  4327    52923  86.2
>    10  4327    52923  86.1
>    11  4328   141129  81.3
>    12  4327    70564  86.2
>    13  4327    70564  86.2
>    14  4327    70564  86.2
>    15  4327    70564  86.2
>    16  4327    70564  86.2
>    17  4327    70564  86.2
>    18  4327    70564  86.2
>
> Parity                      Resource
>    Set  ASP Unit  Type Model Name       Status
>      1            571F  001  DC05       RAID 5
>           1   17  4327  070  DD016      Active
>           1   16  4327  070  DD017      Active
>           1   15  4327  070  DD015      Active
>           1   14  4327  070  DD014      Active
>           1   12  4327  070  DD013      Active
>           1   13  4327  070  DD012      Active
>           1   18  4327  070  DD018      Active
>           1   10  4327  074  DD010      Active
>           1    9  4327  074  DD009      Active
>           1    8  4327  074  DD008      Active
>           1    7  4327  074  DD007      Active
>      2            571F  001  DC05       RAID 5
>           1    2  4328  074  DD006      Active
>           1    3  4328  074  DD005      Active
>           1    4  4328  074  DD001      Active
>           1    5  4328  074  DD002      Active
>           1    6  4328  070  DD003      Active
>           1    1  4328  070  DD004      Active
>           1   11  4328  070  DD011      Active
>
> My boss wants to replace the four 4327-074's with 4329's  (281GB's instead
> of 70GB's).
>
> Physical location:
>   Unit ID. . . . . . . . . . : U5787.001.DQD0C25
>   Planar ID. . . . . . . . . : P2
>   Device . . . . . . . . . . : D7-D10
>
> All attached via:
> Resource        Type-model  Status                Text
> CMB05            571F-001   Operational           Storage Controller
>    DC05           571F-001   Operational           Storage Controller
> Location :   U5790.001.13359A2-P1-C1
>
>
> Rob Berendt