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[SOLVED] - [3PAR_8200] - Adding new disks to CPG and Volumes https://3parug.net/viewtopic.php?f=18&t=2941	Page 1 of 2

Author:	Cykani [ Mon Jul 30, 2018 3:34 am ]
Post subject:	[SOLVED] - [3PAR_8200] - Adding new disks to CPG and Volumes
Hello All, I have a HP_3PAR 8200 with two cages. I have only one CPG for Exchange (composed by 18 disks FC) and which i created one VV. I newly added 30 Disks FC and ran the tunesys command. I still can see the free space on GUI (almost 44 To) but cannot add it to the existing CPG. What shoul i check or do to expand the CPG size and then the VV size ? Thank you.

Author:	MammaGutt [ Mon Jul 30, 2018 4:12 am ]
Post subject:	Re: [3PAR_8200] - Adding new disks to CPG and Volumes
If the new drives fit the characteristics of the CPG, it will allocate the space as needed. 3PAR is a "thin" storage system so VVs and CPGs will grabs capacity from the system as needed, you can't manually "add" capacity to the CPG, only by creating the need (thick volume or growth on thin volumes).

Author:	Cykani [ Mon Jul 30, 2018 4:20 am ]
Post subject:	Re: [3PAR_8200] - Adding new disks to CPG and Volumes
Thanks for your reply. But how to understand it ? Typically, the actual CPG has 16To of size. The VV, created in that CPG has all the size provisionned (Full provisionning) There is 44 To of Free Size. And the CPG and the VV show 100% used. My question is how to demonstrate to the end-user that "his" vv can go upper than 16 To on the hosts ? Thanks

Author:	MammaGutt [ Mon Jul 30, 2018 6:12 am ]
Post subject:	Re: [3PAR_8200] - Adding new disks to CPG and Volumes
Not quite sure what you are asking here but in a healthy system, all thin VVs and all CPGs will be 99 or 100% full. A VV can generally grow to its volume size, unless there isn't enough free space left in the system. showspace -cpg <CPG name> will show you how much "UsableFree" capacity it is in the system and the CPG (and all its volumes) can grow with the current free capacity.

Author:	Cykani [ Mon Jul 30, 2018 7:23 am ]
Post subject:	Re: [3PAR_8200] - Adding new disks to CPG and Volumes
OK for 99% or 100% full state. Here is the answer : Code: 3par-Med cli% showspace -cpg CPG_FC_r5_MED --------------------------(MB)--------------------------- CPG -----EstFree----- -------Usr------- ---Snp---- ---Adm---- -Capacity Efficiency- Name RawFree LDFree Total Used Total Used Total Used Compaction Dedup CPG_FC_r5_MED 34344960 28620800 33566720 30615040 40960 512 16384 256 1.0 - You said "UsableFree", but i don't see it. "EstFree" is the same ?

Author:	MammaGutt [ Mon Jul 30, 2018 7:57 am ]
Post subject:	Re: [3PAR_8200] - Adding new disks to CPG and Volumes
Cykani wrote: OK for 99% or 100% full state. Here is the answer : Code: 3par-Med cli% showspace -cpg CPG_FC_r5_MED --------------------------(MB)--------------------------- CPG -----EstFree----- -------Usr------- ---Snp---- ---Adm---- -Capacity Efficiency- Name RawFree LDFree Total Used Total Used Total Used Compaction Dedup CPG_FC_r5_MED 34344960 28620800 33566720 30615040 40960 512 16384 256 1.0 - You said "UsableFree", but i don't see it. "EstFree" is the same ? You probably have another 3PAR OS version than what I was looking at but yes, under EstFree. RawFree shows raw capacity and LDFree shows how much space that will be after RAID overhead. So CPG_FC_r5_MED can grow with 28620800 MB (or something like 28.5TiB) with the current capacity installed.

Author:	Cykani [ Tue Jul 31, 2018 11:03 am ]
Post subject:	Re: [3PAR_8200] - Adding new disks to CPG and Volumes
I just come back with another question to understand properly your point. Code: 3par-Med cli% showsys ----------------(MB)---------------- ID --Name-- ---Model---- --Serial-- Nodes Master ClusterLED TotalCap AllocCap FreeCap FailedCap 0x18EA5 3par-Med HP_3PAR 8200 CZ2545141S 2 0 n/a 81757184 23995392 57761792 0 While there is "FreeCap", is that mean that if the CPG need more space, he will pick it into "FreeCap" to "AllocCap" ? Also, there is no GrowthLimit configured, should i configure it to allow it to pick free space ? Thanks

Author:	MammaGutt [ Tue Jul 31, 2018 12:01 pm ]
Post subject:	Re: [3PAR_8200] - Adding new disks to CPG and Volumes
Showsys will display raw capacity. TotalCap = total raw capacity (all capacity on all physical disks combined) AllocCap = Allocated capacity = Total Used raw capacity (includes spare capacity) FreeCap = Unallocated raw capacity So when a CPG grows (because the CPG is full and VVs are growing) it will allocate capacity from the free capacity. Growth Limit is veeeeery seldom used. Hitting the growth limit is like running out of space. It is a hard limit. Growth warning is used with AO or when using multiple CPGs to watch and get notified when they grow above a certain limit. None of these will force or make anything grow, just warn og prevent growth.

Author:	Cykani [ Wed Aug 01, 2018 3:56 am ]
Post subject:	Re: [3PAR_8200] - Adding new disks to CPG and Volumes
Dear Mamagutt, Thank you for your patience and answers. It's clear now. I will tell the systems guy that he can extend his local storage on hosts.

Author:	Cykani [ Wed Aug 01, 2018 8:25 am ]
Post subject:	Re: [SOLVED] - [3PAR_8200] - Adding new disks to CPG and Vol
Mamagutt, More information, here is my 3PAR OS Version : Code: 3par-Med cli% showversion Release version 3.2.2 Patches: P03,P04,P43 Component Name Version CLI Server 3.2.2 CLI Client 3.2.2 System Manager 3.2.2 (P43) Kernel 3.2.2 TPD Kernel Code 3.2.2 (P03) TPD Kernel Patch 3.2.2 (P43) There is a limitation of 16TB for the VV size. Maybe that's why i cannot increase it. Just want to share it with you

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