The first is regarding spare disks. I'm going to have a fully loaded

F810 soon;

2 shelves with a total of twenty-one 72GB drives. Since I will have

spare slots

in the shelves I was wondering if I can setup the netapp with a 22nd

drive as a

hot-spare instead of "wasting" one out of my 21 disk pool. The specs on

the F810

say it maxes out at 1.5 TB raw which I will be hitting with the 21

drives.

AFAIK 1.5 TB storage limit includes all installed disks. It means that 22 disk configuration for F810 is definitely not supported by NetApp and it is probably not working (some limits are enforced with Data ONTAP - I am not sure if this as well).

And a much more general question; what does SnapRestore do? I believe this is a separately licensed option and I haven't really been able to glean too much from the Netapp website.

SnapRestore enables you instant reversion to the selected snapshot state of the whole volume (all Data ONTAPs) or single file (Data ONTAP 6.2 or later). "Instant" means without copying data. Actually only necessary pointers are copied. You have to be aware of the following drawbacks: - It is one-way trip (you are loosing all SnapShot copies that were collected after the SnapShot that you selected for reversion). - SnapRestoring of single file has negative performance impact (this operation causes fragmentation of WAFL file system).

I hope this helps.

Best regards,

Jacek Nogala

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