=LSF= Operational Data Network

[The.Rolling.Stoned]

ENCRYPTION: High
PRIORITY:Medium
COMM ID:Captain Martin Welch
SUBJECT: New Data Center established

The Department of RD&A has an aggregate that hosts several volumes used as NFS datastores for our VMWare environment. The volumes are roughly 1.3t in size and deduplicate down to roughly 800-900g.



We were getting close to hitting our theoretical IOPS maximum for the aggregate so we decided to add a shelf of disks to the aggregate before migrating any more virtual machines to the datastores hosted on this aggregate. Time to reallocate.



We are running ONTAP 8.1.1 which says it can reallocate snapshotted and deduplicated blocks by using the -p reallocate switch. In previous versions of ONTAP, my understanding is that it was impossible to reallocate deduplicated blocks. If you dont use the -p switch with ONTAP 8.1.1, only non-deduplicated blocks will be reallocated. Given the great deduplication ratio on the volume/datastore (and snapshots) we decided it was in our best interest to use the -p switch.
Welch Out...