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тАО03-14-2019 10:44 AM
тАО03-14-2019 10:44 AM
difference volumetry storage data betwen VCENTER and 3PAR
Hello,
Excuse my translation, I am new to bay 3PAR.
I do not understand the volumetry of storage between what vcenter says and 3par bay
On vcenter I have datastore with free space
DATASTORES FreeSpaceGB CapacityGB
OHC_VV_BALANCED_01 11852,933 16383,75
OHC_VV_PERFS_01 3153,494 16383,75
OHC_VV_COST_01 1897,857 16383,75
OHC_VV_BALANCED_02 12698,355 16383,75
OHC_VV_PERFS_02 4382,443 18431,5
OHC_VV_PERFS_03 2527,474 16383,75
OHC_VV_PERFS_04 4028,863 20383,75
OHC_VV_PERFS_05 2697,505 16383,75
OHC_VV_NL_01 12475,924 17883,75
On bay 3par I do not have the same storage information :
VV Total Used FreeSpaceGB (Virtualsize-total used) Virtual size
OHC_VV_BALANCED_01 13255,49 3128,26 16383,75
OHC_VV_PERFS_01 13569,2 2814,55 16383,75
OHC_VV_COST_01 14694,05 1689,7 16383,75
OHC_VV_BALANCED_02 12166,97 4216,78 16383,75
OHC_VV_PERFS_02 6379,79 2051,71 18431,5
OHC_VV_PERFS_03 5341,7 1042,05 16383,75
OHC_VV_PERFS_04 17612,05 2771,7 20383,75
OHC_VV_PERFS_05 15859,04 524,71 16383,75
OHC_VV_NL_01 17342,41 541,34 17883,75
We do not find the same free space data betwen 3PAR and VCENTER
if anyone can help me interpret this data ? :)
Thx
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тАО03-18-2019 12:20 PM - last edited on тАО06-18-2021 03:19 AM by Ramya_Heera
тАО03-18-2019 12:20 PM - last edited on тАО06-18-2021 03:19 AM by Ramya_Heera
Re: difference volumetry storage data betwen VCENTER and 3PAR
It would appear the 3PAR virtual volumes have been functioning as vCenter datastores for some time now. Note that, for example, OHC_VV_BALANCED_01 at some time required 13255,49 GB of RAID storage on the 3PAR to hold all the files and data with 3128,26 GB free. Currently vCenter is now showing 11852,933 free, indicating somewhere around 8725 GB was deleted over time from within the datastore.
Being thinly provisioned, the 3PAR virtual volumes hold non-zero data. While that 8725 GB of data was marked "deleted" and is again available for vCenter to use, the file and data bits are still out on the virtual disks in the datastore. The operating system using the virtual disk needs to either clean up as files are deleted, or write one or more large temporary binary zero-filled files to the virtual disk so as to overwrite the no-longer-needed non-zero data.
Go to the Hewlett Packard Enterprise Information Library (https://www.hpe.com/info/storage/docs), and read
- HPE 3PAR StoreServ Storage Concepts Guide
- technical paper on Adaptive Data Reduction Technologies
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company
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тАО03-20-2019 09:05 AM
тАО03-20-2019 09:05 AM
Re: difference volumetry storage data betwen VCENTER and 3PAR
And practical, simply use:
esxcli storage vmfs unmap -l OHC_VV_BALANCED_01
While you are waiting (maybe 1/2 - 1 Hour), you can see the dropping used Space in the SSMC.
Do it not in High Production Time.