replace raid5 disk with tw_cli

[Randy Melder]

if you go through their online tech support, you will get an answer
same day usually. They will correspond via email with answers. I've
used them before, and 3ware/amcc is really prompt.

also, do the following and be prepared to send the output to 3ware.

./tw_cli /c0 show diag
./tw_cli /c0 show alarms

; ) .randy

On Dec 11, 2007 8:05 PM,  <reed at reedmedia.net> wrote:
> I have done this a few times before and documented my steps before, but
> this time, I am out of luck.
>
> Any ideas on the following?
>
> For some reason the new physical disk was assigned to a new "unit 1".
>
> The other three are on "unit 0".
>
> So I deleted that unit:
>
>         tw_cli maint deleteunit c0 u1
>
> Then did the rescan:
>
>         tw_cli maint rescan
>
> That worked but it was flagged as (NO UNIT).
>
> So I created it:
>
>         # tw_cli maint createunit c0 rspare p1
>         Created unit /c0/u1 (Unit Drive Utilization = 100%
>
> And that put it back at u1. I don't see any docs on how to get it to go to
> u0 (unit 0) -- it is not an option in the docs and I tried it and it
> failed.
>
> So rebuilding anyways:
>
>         # tw_cli maint rebuild c0 u1 p1
>
>         (0x0B:0x0031): Rebuild unit ok
>
> And now the spare exists but it is not part of the u0 RAID5 which is still
> DEGRADED.
>
> So this is what the system has:
>
> # of units: 2
>         Unit 0: RAID 5 894.27 GB ( 1875421056 blocks): DEGRADED
>         Unit 1: SPARE 298.09 GB ( 625142448 blocks): OK
>
> # of ports: 4
>         Port 0: WDC WD3200SD-01KNB0 WD-WMAMR1568561 298.09 GB (625142448
> blocks): OK(unit 0)
>         Port 1: WDC WD3200AAJS-00RYA0 WD-WMAPZ0120885 298.09 GB (625142448
> blocks): OK(unit 1)
>         Port 2: WDC WD3200SD-01KNB0 WD-WCAMR2111267 298.09 GB (625142448
> blocks): OK(unit 0)
>         Port 3: WDC WD3200SD-01KNB0 WD-WMAMR1461915 298.09 GB (625142448
> blocks): OK(unit 0
>
>
> (The WD3200AAJS-00RYA0 is the new disk that just replaced a bad
> WD3200SD-01KNB0 originally at Port 1 and unit 0.
>
> Here is my DEGRADED RAID5:
> ...
> Unit /c0/u0
> ---------------------
> Status:        DEGRADED
> Unit Type:     RAID 5
> Stripe Size:   64k
> Size:          894.27 GB (1875421056 blocks)
> # of subunits: 4
>
>         Subunit 0:    CBOD: OK
>         Physical Port: 0
>         Logical  Port: 0
>
>         Subunit 1:    CBOD: DEGRADED
>         Physical Port: N/A
>         Logical  Port: 1
>
> ...
>
> I can't see in the 3ware docs how to make that p1 on u1 be on Unit 0.
>
> I want to replace that DEGRADED Subunit 1 (Physical Port: N/A) with that
> new disk.
>
> Any help or pointers would be appreciated.
>
>   Jeremy C. Reed
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randymelder at gmail.com

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