Comment by Covzire
6 years ago
Same, for at least 6 years in a 4 drive zraid array. It always reads and writes at full gigabit ethernet speeds and I haven't had any downtime other than maintaining FreeBSD updates which are trivial even when going from 10.x to 11 to 12.
"Same" for the last ~4 years, starting with 8 disks and as of 2018, the 24-bay enclosure is full. Each vdev is a mirrored pair split across HBAs to sedate my paranoia. I've replaced a few drives after watching unreadable sector count slowly increase over a few months. I've also switched out most of the original 3TB pairs to 8TB and 10TB pairs. ~42TB usable and the box only has 16GB of RAM (because I can't get the used 32GB sticks to work, it's a picky mainboard and difficult to find matching ECC memory here in Europe). I haven't powered down much except to attempt to replace the RAM or during extremely hot days. Read/write speed is more or less max gigabit, even during rebuild after hot-swapping drives.
Same here (4-drive raidz for many years), though I do have an issue where deleting large files (~1 GB) takes around a minute and nobody seems to know why (I have plenty free space and RAM)...
do you have lots of snapshots? every snapshotting FS I've worked with has really slow deletes, especially when the volume is near capacity.
Snapshots are one thing ZFS is fast at. All the blocks for a given snapshot are placed on a "deadlist". Snapshot deletion is essentially just returning this list of blocks back to the free pool. A terabyte snapshot will take a short while (in the background) to recycle those blocks. But the deletion itself is near instantaneous.
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I have 400 in total, though none on the slow volume :/ That shouldn't affect it, right?
A single 5400 rpm drive (the like of wd red) should be able to saturate gigabit ethernet. 4 drive array should be basically idling.