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Anonymous

5 Practitioner

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274.2K Posts

5156

August 24th, 2016 05:00

impact of command “virtual-volume set-thin-enabled” on DD

Hi,

Customer wants to use command “virtual-volume set-thin-enabled” on Geosynchrony 5.5 U2 with VPLEX Metro.

All distributed devices are in production on customer environment, do you know if there is an impact on I/O or synchronization when issuing the command ?

This command is covered in the 5.5SP2 CLI Guide (https://support.emc.com/docu69395_VPLEX_Command_Reference_Guide.pdf?language=en_US&language=en_US) p.557 and I looked in the 5.5SP2 Admin Guide (https://support.emc.com/docu69393_VPLEX_Administration_Guide.pdf?language=en_US&language=en_US) p.98 “Understanding Thin Provisioning”, but there is no footnote about an impact.

Thank you for your help.

Best regards,


Cécile

Ayrton_Senna1

62 Posts

August 25th, 2016 18:00

I am not sure about the impact of enabling thin-enabled feature for virtual-volume on 5.5.

But here are the limitations of using thin enabled feature of Virtual-Volume: (Documented in page 36 in Release notes of 5.5)

  • Known limitations - Thin provisioning 
  • The following section lists general thin provisioning limitations:
  • Thin provisioning is supported only on:
  • XtremIO 3.0 and 4.0.
  • VMware ESXi 5.0 Patch 1 and later.
  • Configuring thin provisioning on VPLEX can only be performed using the VPLEX CLI.
  • Distributed-devices and remote devices are not thin-capable. Local and distributed mirrors are not thin-capable.
  • For a virtual volume to be thin-capable, it must be built on top of an extent that is mapped 1:1 to a thin-enabled storage-volume.Device-level mirroring is not supported. The virtual volume must be built on top of a local RAID 0 device, a local
  • RAID 1 device with a single leg, or a local RAID C device with a single child.
  • MetroPoint is not supported.
  • XtremIO raises 06/38/07h PROVISIONING SOFT THRESHOLD REACHED on the data path when it hits a pool fullness threshold. However, in VPLEX GeoSynchrony 5.5 SP1, VPLEX does not handle this UA, and does not forward it to the host

CAPTAINAM11

2 Posts

January 22nd, 2018 12:00

From one Sena to another. Thanks for that post above.

Anonymous

5 Practitioner

 • 

274.2K Posts

July 19th, 2018 09:00

Hello cecile.guigot ,

There is no impact of check the thin enabled flag for the Virtual volume.

Best regards ,

Moustafa 

HakanT

9 Posts

December 23rd, 2019 03:00

if the virtual volume has huge IO, Changing "thin-enable" parameter affect to your host IO for 1-2 sec. 

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