I’ve recently started fiddling with the idea of making my own NAS, and boy have I jumped into the deep end. I’ve put it all in the box now, HW wise, but I’ve stumbled on an issue. My ideal RAID would be a RAID 5 with a SSD and 2 HDDs. My concern is regarding the fact that the SSD is an m.2 PCIe gen 4 and the HDD’s are 2 regular SATAs. Would there be any issue with this, and if so, please explain it like i’m 5.
Hi, i suggest to read this resource
Taking care about you should avoid SMR disk at all with zfs, IMHO don’t misc NVME with rust disk in the same pool.
Disks in the same raidz1 mustn’t bee the same, but the usable space/performance will reflect the spec of the smaller/slower disk.
Use a mirror pool with those 2 disks as storage, use the NVME for apps (in stripe, so ensure a good backup strategy)
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You would waste the SSD’s performance and the HHDs’ capacity.
Please read the resource linked above as well as the following. Hardware RAID is incompatibile with ZFS.
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