May 22, 20242 yr I created a 2x1Tb 2.5" SSD pool from 2 new drives last May. It's been fantastic until a week or two ago. Now, I have VERY slow read/write speeds. It's so slow that my 240mbps download speed is faster than the pool can write. I originally had it formatted as a BTRFS, but rebuilt it as a ZFS pool this past weekend. It seemed to be running much.better, but last night the speeds bottomed out again. Restarting the Dockers, array and the server itself did nothing to help. Neither of the drives have any errors in the logs, SMART reports, or the scrubs. They're just almost unusably slow. If the SSDs are wearing out, shouldn't I be seeing actual errors?
May 22, 20242 yr Author The 2 SSDs are connected to one of the ports of my HBA controller, an LSI IT-mode 9207-8i, with the 2nd port connected to my EMC KTN-STL3 JBOD 15-bay shelf.
May 22, 20242 yr Community Expert Could be the SSDs, also note that having them on the LSI won't support trim, if you have a different one try it, or try those on the onboard SATA ports, after a full device discard.
May 22, 20242 yr Author 23 minutes ago, JorgeB said: Could be the SSDs, also note that having them on the LSI won't support trim, if you have a different one try it, or try those on the onboard SATA ports, after a full device discard. Because this pool is both the Array write cache, AND a "work" space, I'm thinking about switching to 2.5" spinning drives, mainly due to the NZBs, which creates a lot of files.
May 22, 20242 yr Author Or, create 2 separate pools: Work - 4-6x 512Gb, RAID-0, spinning disks Array cache - 2x1Tb, Raid-1, SSD or spinning?
May 23, 20242 yr Author After work, I set everything to not use the Work pool just to see how the system runs without it and t's doing fantastic. I did shut down Tdarr for the time being. I had ordered 2x 1Tb drives for my previous server build, but never did install them. I also ordered 2x 1Tb and a 4-bay hot-swap adapter, which are due to deliver tomorrow. The array cache will be Raid-1 and the work cache will be Raid-0. I might try the SSD's directly on the MB SATA ports, but will probably just trash them. They're cheap drives and with all of the write/deletes from the NZBs, I'm guessing that they're worn out. If the change to spinning drives works out, I'll most likely add another hot-swap bay and more drives to the caches over time to help primarily with transfer speeds. Thanks for the help.
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