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| Compact CPG Query https://www.3parug.com/viewtopic.php?f=18&t=1115 |
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| Author: | ag3parug [ Mon Jan 19, 2015 6:09 am ] | ||
| Post subject: | Compact CPG Query | ||
Hi, I am going to run a CPG compact task and am curious about some of the terminology used in the GUI menu. Can anyone enlighten me as to what the following mean:
SD Space USR Space (I assume this to mean user space as in that we are using for servers)
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| Author: | kk2491 [ Mon Jan 19, 2015 6:57 am ] |
| Post subject: | Re: Compact CPG Query |
Hi sir, Please find the details below: There are three types of logical disk: 1. User (USR) logical disks provide user storage space to fully provisioned virtual volumes. 2. Shared data (SD) logical disks provide the storage space for snapshots, virtual copies, thin provisioned virtual volumes (TPVV) or thin duplicated virtual volumes (TDVV). 3. Shared administration (SA) logical disks provide the storage space for snapshot and TPVV/TDVV administration I believe this is useful. Correct me if I'm wrong.  Regards, KK |
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| Author: | ag3parug [ Mon Jan 19, 2015 8:28 am ] |
| Post subject: | Re: Compact CPG Query |
Hi kk2491, Thank you for your swift reply You may be right - I reached out to another person I know who has a 3PAR array and they came back with the following - SA - Snapshot Administration - space used to track snapshot/administration data SD - Snapshot Data - space used by snapshots USR - Space for all user data, he seemed to think regardless of whether it was a TPVV or FPVV I'm interested to hear if anyone else concurs with either of these or has an entirely different understanding
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| Author: | kk2491 [ Mon Jan 19, 2015 9:43 am ] |
| Post subject: | Re: Compact CPG Query |
Ok.. Thats great.. One more, you can refer the below doc. http://h20195.www2.hp.com/v2/GetPDF.asp ... 987ENW.pdf This gives u better clarity hopefully. Regards, KK |
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| Author: | Architect [ Tue Jan 20, 2015 2:38 am ] |
| Post subject: | Re: Compact CPG Query |
On the ld naming scheme: SA is the administration space of the CPG, storing the volumes metadata. SD space is used for TPVVs as wel as snap space. Deduped volumes are a special kind of TPVV, called "TDVV". Data is indeed saved in LDs with an "SD" naming scheme as well. Full fat VVs are usually using LDs with the same name as the VV, except when the full VVs are part of an AO-set. The AO movement process aggregates the Volumes data in "SB" LDs in that case. Anyway, confusingly, only this fat volume space is referenced as USR space. Probably a remnants from time tpvvs did not exist yet. |
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| Author: | ag3parug [ Wed Jan 21, 2015 6:42 am ] |
| Post subject: | Re: Compact CPG Query |
OK so if I understand things correctly the only data in the USR space would be thick provisioned volumes? Normal thin provisioned volumes would be in the SD space and if I follow what you say volumes that are part of an AO configuration also exist within the SD space? Sorry if I'm being a bit slow - all so new to me! |
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| Author: | Architect [ Wed Jan 21, 2015 7:32 am ] |
| Post subject: | Re: Compact CPG Query |
No worries, we've all been there and i'm happy to explain and help Simplified: thin volumes and snaps store data in SD-space. thick volumes store data in USR-space. this is regardless of using AO. |
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| Author: | ag3parug [ Thu Jan 22, 2015 10:28 am ] |
| Post subject: | Re: Compact CPG Query |
Fantastic - thanks all
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