jenksdrummer
Patron
- Joined
- Jun 7, 2011
- Messages
- 250
Anyone else notice high frag rates with special VDEVS?
My smaller supermicro box config:
2 data vdev, mirrored pair vdev WD Gold 10TB
1 speciall vdev, mirrored pair 240GB Intel DC SATA SSD
1 nvme M.2 500GB L2ARC
128GB RAM
Right now, I have dedupe turned on, with about 5TB of data, and I am seeing about 55% frag for the special VDEV. Before copying off the data and back on w/ dedup enabled, I recall I noted 25%; where the special vdev was doing only metadata instead of metadata+dedupe.
Oddly, my larger SM box doesn't seem to have this issue with the same data; frag rates are way less...though slightly different topology:
6 data vdev, mirrored pairs, WD Gold 10TB
1 special vdev, mirrored pair 240GB Intel DC SATA SSD
1 nvme m.w 1TB L2ARC
256GB RAM
1 dedupe vdev, mirrored pair nvme M.2 1TB
Though there is a difference; the smaller box is doing periodic snapshots.
My smaller supermicro box config:
2 data vdev, mirrored pair vdev WD Gold 10TB
1 speciall vdev, mirrored pair 240GB Intel DC SATA SSD
1 nvme M.2 500GB L2ARC
128GB RAM
Right now, I have dedupe turned on, with about 5TB of data, and I am seeing about 55% frag for the special VDEV. Before copying off the data and back on w/ dedup enabled, I recall I noted 25%; where the special vdev was doing only metadata instead of metadata+dedupe.
Oddly, my larger SM box doesn't seem to have this issue with the same data; frag rates are way less...though slightly different topology:
6 data vdev, mirrored pairs, WD Gold 10TB
1 special vdev, mirrored pair 240GB Intel DC SATA SSD
1 nvme m.w 1TB L2ARC
256GB RAM
1 dedupe vdev, mirrored pair nvme M.2 1TB
Though there is a difference; the smaller box is doing periodic snapshots.