Thursday, January 9, 2014

Vol Options/Thin Provisioning

Once volume guarantee is set to none the volume is considered thin provisioned.  If thin provisioning is being used, I recommend these for most data sets:
Block:
·         Turn on vol autosize
·         Turn off snapshot reserve
·         Turn off fractional reserve (depends on the workload)
·         Turn on snap autodelete (based on the size taken up by snapshots or their age)
o    commitment=try
o    trigger=volume
o    target_free_space=20%
o    delete_order=oldest_first
o    defer_delete=user_created
o    try_first=volume_grow

Turn off LUN reserve
Turn off LUN Space guarantee 

File:
·         Turn on vol autosize
·         Turn snapshot reserve=20%
·         Turn on snap autodelete (based on the size taken up by snapshots or their age)
o    commitment=try
o    trigger=snap_reserve
o    target_free_space=20%
o    delete_order=oldest_first
o    defer_delete=user_created
o    try_first=volume_grow

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