HPE Storage Users Group

We have 24 x 1TB NL disks in a 4-shelf 7200 - so 6 columns x 4 rows - need to change things to a 4 columns x 6 rows layout with adding more shelves (but don't want to buy more NL disks). So we want to go from a 6x4 layout to a 4x6 layout.

So we want to go from the following (there are 4 columns of ssd and 6 of fc not shown before the nl disks) :-

x x x x x x
x x x x x x
x x x x x x
x x x x x x

to :-

x x x x
x x x x
x x x x
x x x x
x x x x
x x x x

The disks are empty - no vv's exist so I presume no ld's exist either.

-------- Normal Chunklets -------- ---- Spare Chunklets ----
- Used - -------- Unused --------- - Used - ---- Unused ----
Id CagePos Type State Total OK Fail Free Uninit Unavail Fail OK Fail Free Uninit Fail
10 0:10:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
11 0:11:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
12 0:12:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
13 0:13:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
14 0:14:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
15 0:15:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
26 1:10:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
27 1:11:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
28 1:12:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
29 1:13:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
30 1:14:0 NL normal 902 0 0 898 0 0 0 0 0 4 0 0
31 1:15:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
42 2:10:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
43 2:11:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
44 2:12:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
45 2:13:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
46 2:14:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
47 2:15:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
58 3:10:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
59 3:11:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
60 3:12:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
61 3:13:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
62 3:14:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0
63 3:15:0 NL normal 902 0 0 899 0 0 0 0 0 3 0 0

To do this, is it to use "setpd idalloc off <pdid>" for each of the 8 drives we need to move, followed by "dismisspd <pdid>" for each of them when setpd has finished

Then add/power/cable the 2 new cages/shelves and install the ssd/fc disks into the same columns as the existing 4 shelves above - with the 8 NL disks in their 4 x 2 layout below the 4x4 nl layout.

And then the "admithw" command (which will probably be done automatically) will recognise them and create new chunklets ready for ld's and all is well in the world ?

Another 12 x fc disks will be added as well in the next 2 columns after the nl columns but stage one will be remove the 8 nl disks before moving them to the new shelves and their 4 x ssd/6 x fc disks + 4 x nl- and then finally add in 6 rows of 2 x fc disks for the remaining 12 fc disks for more fc performance.

So the final layout will be:-

ssd ssd ssd ssd fc fc fc fc fc fc nl nl nl nl fc fc
ssd ssd ssd ssd fc fc fc fc fc fc nl nl nl nl fc fc
ssd ssd ssd ssd fc fc fc fc fc fc nl nl nl nl fc fc
ssd ssd ssd ssd fc fc fc fc fc fc nl nl nl nl fc fc
ssd ssd ssd ssd fc fc fc fc fc fc nl nl nl nl fc fc
ssd ssd ssd ssd fc fc fc fc fc fc nl nl nl nl fc fc

The 7200 system is on v3.1.3 mu1.

I would think that as long as you dismiss them first you should be fine.

If it were me, I would add the shelves first and then dismiss/admit them one at a time.

Would hp do it for you as part of adding the shelves? (Purchasing the shelves usually includes installation)

This is something you should ask hp to plan for you.

As mentioned, with the purchase of the disk shelves you get a plan, and as a part of that plan you can request a movement of the disks too and hp will plan it all for you and produce a step by step guide.