Actually, the aggregate snap reserve is by default only 5%, not 10%.
I have never seen a volume go over 100% usage, in fact the filer yells at you and could take the volume offline if it can't write data. Are you sure you're not talking about consumption of the snap reserve, which CAN go over 100%?
Glenn
"It's worth remembering that ONTAP already imposes a 10% reserve on the filing system size (including snapshot reserve); or on the sum of sizes, for flexible volumes in an aggregate. A "100% full" tradvol/aggregate is actually only using 90% of the blocks on the discs. Or looked at another way, the difference in congestion between "90% full" and "100% full" is 2:1, not infinity:1.:
"Blake Golliher" thelastman@gmail.com writes:
A filer can be written to over 100% space utilization, it'll just keep growing. I've seen filers go up tot 107% space utilization before.
and "George, Andrew" georgea@anz.com replies:
Interesting We run a fair few filers in the 97%-99% arena, mainly as CIFS NAS
devices.
Every time I've seen it hit 100% 0 bytes available CIFS has refused to
save anything.
That's my experience, with NFS. I would be interested (from a theoretical point of view!) to know how Blake gets the space utilisation that high. (Snapshot usage vs reserve as shown by "df" can go over 100%, of course.)