Datastore Free space on Netapp A-SIS Volume

[gesturgis]

Hey folks,

Running ISCSI to a Netapp filer on a volume with A-SIS enabled. df -h on the filer says:

/vol/VM_vol_1/ 1000GB 488GB 511GB 49% /vol/VM_vol_1/

Showing 511GB free. This is an A-SIS enabled volume with significant deduplication savings:

df -sh shows:

/vol/VM_vol_1/ 488GB 421GB 46%

But ESX 4.0 shows that vdf -h:

/vmfs/volumes/4c4f5c7b-769036ea-da85-002564fc1ce7

900G 868G 31G 96% /vmfs/volumes/VM_vol_1:2

Can I use this 511GB of free space?

[RParker]

Can I use this 511GB of free space?

Not unless you configure the volume to autogrow and share the aggregate pool. Otherwise reduce the volume to say 50GB free, and create a NEW volume on the same aggregate. (511GB).

And that is about all you can get out of SIS, 40-50% savings.

Also I would say ESX is showing 868Gb allocated of 900Gb you configured, which means you probably didn't use thin provision. But showing that it's pretty much full, you should have no problem reducing the volume size.