VMware Cloud Community
ESXi40
Contributor
Contributor
‎09-13-2011 03:56 AM

Esxi 5.0: Downgrade block size

Hi all,

i try to install ESXi 5.0 but i can't downgrade the block size from 1MB to 4 Kb. Why?

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idle-jam
Immortal
Immortal
‎09-13-2011 04:29 AM

it's default in ESXi5 and i do not see a reason of downgrading. for lower block it is advisable to format it from version 4 then upgrade to version 5 but then this is waste of time as the different block levels does not have performance difference

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ESXi40
Contributor
Contributor
‎09-13-2011 06:48 AM

it's possible tu upgrade from 1MB to 4 MB??

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idle-jam
Immortal
Immortal
‎09-13-2011 06:51 AM

vsphere5 has a unified support of 1MB block only natively, unless the datastore is inherited from vsphere4

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a_p_
Leadership
Leadership
‎09-13-2011 02:02 PM

There's no need to up- or downgrade the VMFS block size in VMFS-5. As already mentioned the unified block size is 1 MB and cannot be modified. VMFS-5 no supports LUNs with up to ~64TB with this block size. In addition to supporting larger LUNs, the sub-block size has been reduced from 64kB to 8kB.

see e.g. http://www.yellow-bricks.com/2011/07/13/vsphere-5-0-what-has-changed-for-vmfs/ for more details

André

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