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CPG Expansion in 3PAR T400

choudharya
Occasional Advisor

CPG Expansion in 3PAR T400

In my 3PAR T400, we have CPGs made up of both FC and NL Disks. NL has the physical capacity as mentioned-

Total size is 44 TB
Allocated 34 TB
Free 10 TB

We have made three CPGs out of it, one is RAID1 and other RAID5 and RAID6, However, the CPGs are nearing to its allocated percentage (99% full and red), despite free space. I have the following questions-

1. whether i can expand the CPGs with this free space.

2. Can I do it on the fly? Do i need to bring down the servers associated with the CPGs.

3. What is the process of CPG expansion?

I have just stared working on 3PAR, and these are the first hurdles in my path. I need the assistance of this forum to accompolish my task succesfully.

Many thanks in advance

Best Regards from INDIA

6 REPLIES
Sheldon Smith
Honored Contributor

Re: CPG Expansion in 3PAR T400

A CPG is just a policy that determines how free space is allocated. 10TB ~ 40,000 NL chunklets. Changes to the limits of a CPG are invisible to the hosts.

 

Presumably, all you need to do is change either the Warning limit or Allocation limit so the CPG can make use of some (all?) of the remaining free NL chunklets. If you do not really need the limits, you could use a command like

setcpg –sdgl 0 –sdgw 0 <CPG_name>

See the HP 3PAR Command Line Interface Reference manual for more information.

 

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choudharya
Occasional Advisor

Re: CPG Expansion in 3PAR T400

Thank you Sheldon, but in my case Warning limit or Allocation limit is not checked, and CPG is 99% full.

Dennis Handly
Acclaimed Contributor

Re: CPG Expansion in 3PAR T400

>in my case Warning limit or Allocation limit is not checked, and CPG is 99% full.

 

What command are you using that says 99%?

What does "showcpg -r" show?

 

Have you used compactcpg yet?

What does "showspace -t 1" and "showspace -t 6" show?

 

choudharya
Occasional Advisor

Re: CPG Expansion in 3PAR T400

OK, i tried compact CPG and recovered 2TB. However, CPG is still red, how can i make it allright. I ran commands and still see the free space.

 

3PARCLAXA01 cli% show cpg -r
invalid command name "show"
3PARCLAXA01 cli% showcpg -r
                                     ------------------------------------------(MB)-------------------------------------
-----
                   -Volumes- -Usage- --------------- Usr --------------- ---------- Snp ----------- ---------- Adm -----
-----
Id Name      Warn% VVs TPVVs Usr Snp    Total   RTotal     Used    RUsed   Total  RTotal Used RUsed Total RTotal  Used
RUsed
 0 CPG-FC-R5     -  85    64  85   0 10428800 12514547 10424960  7087104 1970560 2364685    0     0 24576  73728 15488
46464
 1 CPG-FC-R1     -   0     0   0   0        0        0        0        0       0       0    0     0     0      0     0
    0
 2 CPG-FC-R6     -   0     0   0   0        0        0        0        0       0       0    0     0     0      0     0
    0
 3 CPG-NL-R5     - 100    79 100   0 27565696 33078807 27555200 21148877   98944  118761    0     0 32768  98304 23296
69888
 4 CPG-NL-R1     -   4     4   4   0   356992   713984   356992        0    9600   19200    0     0  8192  24576  1152
 3456
 5 CPG-NL-R6     -   1     1   1   0     6144     8192     6144        0   12288   16384    0     0  8192  24576   128
  384
------------------------------------------------------------------------------------------------------------------------
-----
 6 total                     190   0 38357632 46315530 38343296 28235981 2091392 2519030    0     0 73728 221184 40064 1
20192
3PARCLAXA01 cli% showspace -t 1
Illegal raid type 1, specify r0, r1, r5, or r6
3PARCLAXA01 cli% showspace -t 6
Illegal raid type 6, specify r0, r1, r5, or r6
3PARCLAXA01 cli% showspace -t r1
--Estimated(MB)---
RawFree UsableFree
9870336    4935168
3PARCLAXA01 cli% showspace -t r6
--Estimated(MB)---
RawFree UsableFree
9865216    7398912
3PARCLAXA01 cli% showspace -t r5
--Estimated(MB)---
RawFree UsableFree
9864192    7398144
3PARCLAXA01 cli%

Sheldon Smith
Honored Contributor

Re: CPG Expansion in 3PAR T400

Hmm, I wonder: Post the output of "showcpg -sag" and "showcpg -sdg".


Note: While I work for Hewlett Packard Enterprise, all of my comments (whether noted or not), are my own and are not any official representation of the company.
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Sheldon Smith
Honored Contributor

Re: CPG Expansion in 3PAR T400

And "showlicense".


Note: While I work for Hewlett Packard Enterprise, all of my comments (whether noted or not), are my own and are not any official representation of the company.
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