2020年9月21日 · Introduction ZFS Allocation Classes: It isn’t storage tiers or caching, but gosh darn it, you can really REALLY speed up your zfs pool. From the manual: Special Allocation Class The allocations in the special class are dedicated to specific block types. By default this includes all metadata, the indirect blocks of user data, and any deduplication tables. The class can also be provisioned to ...

2021年1月23日 · The, when ZFS goes to write a bit of data, it would share the data among the vdevs, using raidz2 on the first bit, mirroring the second bit, then putting the raw bit on the single vdev. Then, if there is a cable error, a power fluctuation, a drive read error, or even fault on the single disk vdev, the whole pool ends, and has to be rebuilt from ...

2020年6月27日 · I do understand the drive redundancy is per vdev, in that losing 2 drives in a single vdev is catastrophic failure. However, using 4 x mirrored vdevs would allow for easy expansion either by adding mirrors or replacing disks in mirrors. (interestingly according to the primer linked above, you can expand a RAIDZ vdev the same way)

2022年12月4日 · zfs set primarycache=all pool1 zfs set primarycache=metadata pool2. zfs set secondarycache=all pool1 zfs setsecondarycache=metadata pool2. What the SPECIAL Device does is store it persistently in your pool inside of a VDEV. Your pool is only as fragile as it’s weakest link, and if your Special VDEV fails, your entire pool fails.

2022年12月5日 · A special vdev can theoretically be removed, but this is not to be done casually. You should have a full backup confirmed good before trying it, as there remains the slim possibility of killing the pool if something goes wrong like here: Pool corruption after export when using special vdev · Issue #10612 · openzfs/zfs · GitHub

2023年7月27日 · Hey everyone! So, my brain has cooked up a thing, which I want to share with you, in the hopes, that we could brainstorm over it and work out, if this is actually feasible. I currently am obsessed with building the most power efficient Server for my needs. I have a zpool containing two mirrored spinning disks, which currently are running 24/7. Because this is my Home Server, the zpool is ...

2025年2月22日 · I use ZFS 2.3.0 on Rocky Linux 9.5 with ELRepo 6.12 kernel. In my home environment I’ve migrated 10 TB of data from a 2x18TB mirror to 3x18TB raidz1 and added a special vdev for metadata to the new zpool. The old mirror zpool had compression=on and default settings for recordsize, the new raidz1 zpool was created with recordsize=1M and compression=on. The special vdev for metadata is two ...

2023年1月7日 · When using multiples of the above recommendations, you can add another VDEV of the same type to the Pool for added safety. For Example, 12 Disks could be configured in two Zraid2 VDEVs with 6 disks each. Configuring a ZFS Pool with three Disks. Follow the steps below to create a ZFS Pool with a singular RAIDZ-1 VDEV.

2022年5月31日 · It would be interesting if you could configure ZFS to use the special vdev for the ZIL as a quasi-SLOG. But if you wanted to do that today you could simply partition the special vdev drives and attach the first partition of each as the SLOG and the second partition of each as the special vdev (or vice-versa).

2023年9月2日 · Ok, so there is a lot of data that I’ve been trying to process. Now, the reason I’m here is because I am building an, admittedly overkill, PLEX server based on TrueNAS Scale. I have a rack case from Sliger with eight 5.25" bays all filled with Icy Dock MB608SP-B 6x2.5" drive cages. The hardware is an Asus P12R-E-10G, an Intel Xeon E-2388G, 128GB ECC RAM, and two LSI 9305-24i HBAs. My boot ...