IaaS (Server) Senior Systems Engineer | Hampshire & Isle of Wight Constabulary and Thames Valley Police
Original Message:
Sent: Tue October 01, 2024 05:34 AM
From: Evelyn Perez
Subject: FS5200 Vmware unmap reclaim space
Hi Apidesh - a Few things to be aware of with regard to space reclamantion:
1: Host unmap should only be enabled for flash storage. If you enable host unmap and you have SAS nearline attached you will see issues where the drives are unable to keep up with the unmap commands and cause latency spikes.
2: Thick or fully allocated volumes, regardless of pool type will not reclaim space, they are fully allocated. We will reserve the full capacity in that volume. However, we will overwrite any new data written to the address range provisioned to them.
3: Thin provisioned volumes will (if enabled) reclaim space. However! If you are running a data reduction pool, any unmaps (if enabled) will reclaim space in the pool as in the drives as garbage is collected over time. If you are running a Traditional Storage Pool, this space is reclaimed from the drives, it is NOT reclaimed from the storage pool automatically. However, the behaviour of the thin provisioned volumes is to re-use the extents so generally this is not a huge issue. With the more recent releases we have provided a utility that will do a slow reclaim process in the background for such capacity. Please contact IBM Support in order to get instructions on how to use this utility. You can of course manually do this by mirroring (local vdisk mirror) the volume to a new thin provisioned volume and then deleting the original copy.
I hope this helps.
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Evelyn Perez
IBM Senior Technical Staff Member
IBM Storage Virtualize Software Architect for SVC and FlashSystem
Original Message:
Sent: Mon September 30, 2024 04:50 AM
From: Apidesh Dulma
Subject: FS5200 Vmware unmap reclaim space
Hi Nezih ,
We can use command first time and once time "chsystem -hostunmap on" on the FlashSystem?
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Best Regards,
Apidesh Dulma
Managing Director/Service Manager
A Vision IT Systems(Thailand) Co.Ltd.
M:(+66)81-822-2904, (+66)61-390-2710
E:apidesh@avisionitsystem.com
www.avisionitsystem.com
Original Message:
Sent: Mon March 04, 2024 11:29 AM
From: Nezih Boyacioglu
Subject: FS5200 Vmware unmap reclaim space
Hi Thomas,
Have you enabled host unmap on FS5200 (check lssystem command output)?
If it's enabled, and you're sure you've deleted some data on this volume, use this esxcli command to force scsi unmap to reclaim space. if host unmap is not enabled, enable it via "chsystem -hostunmap on" before running the following command.
esxcli storage vmfs unmap -u naa.600507681281023208000000000000002c
Note: If you're using FCM based generic (thick) volumes, it will not show reclaimed space (it will be shown in future code levels).
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Nezih Boyacioglu
Original Message:
Sent: Mon March 04, 2024 10:01 AM
From: Thomas Greß
Subject: FS5200 Vmware unmap reclaim space
Hi,
To me it looks like unallocation/restoring space doesn't work.
I got a brand new FS5200 with FCM4 modules. So I'm on 8.6.3.0 to benefit from the new ransomware feature
Is there something wrong with my configuration?
esxcli storage core device vaai status get -d naa.6005076812810232080000000000002c
Display name: IBM Fiber Channel Disk (naa.6005076812810232080000000000002c)
Has an adjustable display name: true
Size: 409600
Device type: direct access
Multipath plugin: NMP
Devfs path: /vmfs/devices/disks/naa.6005076812810232080000000000002c
Provider: IBM
Model: 2145
Revision: 0000
SCSI level: 6
Is pseudo: false
Status: switched on
Is RDM capable: true
Is local: false
Is removable: false
Is SSD: false
Is VVOL PE: false
Is offline: false
Is permanently reserved: false
Full queue sample size: 0
Queue full threshold: 0
Thin provisioning status: unknown
Attached filters:
VAAI status: supported
Other UIDs: vml.02000100006005076812810232080000000000002c323134352020
Shared across the cluster: true
Is SAS: false
Is USB: false
Is boot device: false
Maximum device queue depth: 64
Number of outstanding IOs with competing worlds: 32
Drive type: unknown
RAID level: unknown
Number of physical drives: unknown
Protection activated: false
PI activated: false
PI type: 0
PI protective mask: NO PROTECTION
Supported Guard Types: NO GUARD SUPPORT
DIX activated: false
DIX Guard Type: NO GUARD SUPPORT
Emulated DIX/DIF enabled: false
esxcli storage core device list -d naa.6005076812810232080000000000002c
VAAI plugin name:
ATS status: supported
Clone status: supported
Zero status: supported
Deletion status: not supported
If you need any further information please let me know.
Thank you.
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Thomas Greß
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