Carrying on from the last post where I was wondering why my aggregates were 10% (actually more but it is a SIM) less than what I would expect from the disks, and it turns out there is a hidden WAFL reserve of 5% or 10%.
What is the recommended free space for aggregates?
Other interesting links:
Can the hidden 10 percent disk space reserved for WAFL be adjusted? - NO
- Beginning in ONTAP 9.12.1, the WAFL reserve for aggregates greater than 30TB is reduced to 5% for All Flash FAS (AFF) and the FAS500f platforms.
- Beginning in ONTAP 9.14.1, this same reduction applies to aggregates on all FAS platforms, resulting in 5% more usable space in the aggregates.
Summary:
For a performance system you want >10% free space (i.e. aggregates maximum 90% full). If you weren't so concerned about performance, you could keep it under 95% free for deduplication to work. If you disabled storage efficiency (if you can) then could you go up to 99%? I don't see why not. I''ll ask.
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