Hi David,
as far as i can see, everything is as expected.
When you
have fractional_reserve set to 100 (%), as soon as you create snapshots on that
volume, ontap will reserve 100% of the Luns size within the volume, to gurantee
writes to complete successfully.
The maths show:
820GB * 0,8 (for snap reserve) = 656 GB
320GB Lun * 2 (for fractional reserve) = 640
GB
P = 640 / (656*100) = 97,56 %
Think ontap is doing some rounding, so 98% is
correct.
Regards
Jochen
Hi, please excuse my noobness, I've
recently inherited a Netapp system or 3, I'm fairly new to SANs in general and
netapp in particular. This isnt my full time gig (storage), its one thing
amongst the 2 thousand other things I'm working on today, but I allocate a fair
amount of time to figuring this stuff out.
I'm struggling with something I'm sure all netapp storage people go
through, I've read the manuals, I've played around for about 6 months on the
filers and I cant answer this.
I
have a FAS3020. I have a volume, lets call it vol_bond. Its 820GB, 20% snap
reserve. It contains one lun, which is 320GB. The space guarantee is volume, and
fractional reserve is 100.
Currently, there are 5 snapshots, totalling 8GB. It is snap mirrored to
another filer. Snapshots are created nightly, there are no problems with
that. At weekends, after various backup activity, these grow to about 80GB, but
we only keep 5 and they're deleted.
Its all up and running, everythings fine.
Except for the filer status which reports: /vol/vol_bond is full (using or reserving 98% of space and 0% of inodes,
using 49% of reserve) and the df -r output is
/vol/vol_bondv8/ 687865856 670681368 17184488
335194536 /vol/vol_bondv8/
/vol/vol_bondv8/.snapshot 171966464 14140040 157826424
0 /vol/vol_bondv8/.snapshot
What am I missing? I thought I had this thing nailed but
obviously not.
Dave Ashton
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