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 Post subject: VV free space reclaim
PostPosted: Thu Oct 26, 2017 1:28 am 

Joined: Thu Oct 26, 2017 1:21 am
Posts: 16
Hi :)

I see that you had similar topics but I want to get stuff clear.

We are having 3par8200 storeserv with 3 CPG and 3 coresponding VV (raid1 radi5 and radi6). We are mooving data from radi6 to radi5. I was hoping when I move data from one VV that that free space will be rearanged to another VV. But that doesn't be the case. Al my CPG are 99% capaciti alocated.

Is there any way I can transfer this free space from one VV to another? They are all thin provison with zero detect policy enabled

copactcpg and sdelete don't work

thx in advanced


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 Post subject: Re: VV free space reclaim
PostPosted: Thu Oct 26, 2017 3:25 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 454
What is the operating system you are using on the hosts? Vmware? Windows 2008? Windows 2012?

Compact CPG will only release free space within the CPG. If your CPG is 99%, there usually isn't anything for compact CPG to release.

Could you provide the "showvv -s" output?


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 Post subject: Re: VV free space reclaim
PostPosted: Thu Oct 26, 2017 4:31 am 

Joined: Thu Oct 26, 2017 1:21 am
Posts: 16
----Adm---- ---------Snp---------- -------------Usr--------------
---(MB)---- --(MB)--- -(% VSize)-- ------(MB)------ --(% VSize)-- ------(MB)------- -Capacity Efficiency-
Id Name Prov Type Rsvd Used Rsvd Used Used Wrn Lim Rsvd Used Used Wrn Lim Tot_Rsvd VSize Compaction Dedup
1 .srdata full base 0 0 0 0 0.0 -- -- 61440 61440 100.0 -- -- 61440 61440 -- --
0 admin full base 0 0 0 0 0.0 -- -- 10240 10240 100.0 -- -- 10240 10240 -- --
3 Raid1 tpvv base 3200 2921 512 0 0.0 0 0 4047232 3179080 25.3 0 0 4050944 12582912 4.0 --
4 Raid5 tpvv base 1280 977 512 0 0.0 0 0 1508736 1503238 11.9 0 0 1510528 12582912 8.4 --
2 Raid6 tpvv base 7040 6395 512 0 0.0 0 0 8484992 3103015 24.7 0 0 8492544 12582912 4.0 --
------------------------------------------------------------------------------------------------------------------------------------
5 total 11520 10293 1536 0 14112640 7857013 14125696 37820416 4.8 --

host is on windows server 2012 R2


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 Post subject: Re: VV free space reclaim
PostPosted: Thu Oct 26, 2017 4:33 am 

Joined: Thu Oct 26, 2017 1:21 am
Posts: 16
what would happen if I delete raid6 VV? will bound cpg also be deleted?what would happen with free space form deleted VV?


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 Post subject: Re: VV free space reclaim
PostPosted: Thu Oct 26, 2017 6:50 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 454
If you compare Usr Used with Usr Rsvd on Raid6 VV, you can see that the volume has 3.103.015 MB of data, while 8.484.992 MB is reserved. There is a background task running on the system that will reclaim the ~5.350.000 MB of zeros currently in the Raid6 volume.

You also have about 900.000 MB in the Raid1 volume.

If you run the following command i CLI you will see how much it reclaims on your system the last 24 hours.
showeventlog -debug -oneline -msg reclaim -min 1440

If you delete the Raid6 VV, within a few seconds/minutes all space will be freed to the CPG. If you run compact CPG then it should release almost all of the space (usually a CPG will always have a few GB of data)


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 Post subject: Re: VV free space reclaim
PostPosted: Fri Oct 27, 2017 4:07 am 

Joined: Thu Oct 26, 2017 1:21 am
Posts: 16
mammagutt thank you very much for your answers...and patience :D

I still don't get it why there is no free space showing in the cpg?when I delete data on VV, shouldn't free space be shown in cpg?


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 Post subject: Re: VV free space reclaim
PostPosted: Fri Oct 27, 2017 8:00 am 

Joined: Mon Sep 21, 2015 2:11 pm
Posts: 454
sanjac wrote:
mammagutt thank you very much for your answers...and patience :D

I still don't get it why there is no free space showing in the cpg?when I delete data on VV, shouldn't free space be shown in cpg?


Eventually it will, but it isn't instant. What you see under Usr Used is what the 3PAR knows to be the total of all 16kB blocks in the VV which isn't all zeros. That is where the Usr Rsvd should end up when all the space is reclaimed. If you delete a VV it will be rather instant, but when deleting content within a VV there is a lot of background tasks/defragmentation (not sure on the details here) that is needed to free that space.

Just to feed my curiosity. How much space is reclaimed per 24 hours? And how many physical drives (and of what type) do you got in the system? I've seen large 7400-4n do 1+TB a day, but also seen very small 7200s doing low double-digit GB per day.


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 Post subject: Re: VV free space reclaim
PostPosted: Thu Nov 09, 2017 6:14 am 

Joined: Thu Oct 26, 2017 1:21 am
Posts: 16
mammagut..after waiting for 2 weeks and no free space showing on cpg we decided to delete VV and that helped


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