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Using disc spanning for RAID array (lemmy.world)

submitted 2 years ago by qaz@lemmy.world to c/selfhosted@lemmy.world

9 comments fedilink hide all child comments

I'm planning on building a new home server and was thinking about the possibility to use disc spanning to create matching disk sizes for a RAID array. I have 2x2TB drives and 4x4TB drives.

Comparison with RAID 5

4 x 4 TB drives

1 RAID array
12 TB total

4 x 4 TB drives & 2 x 2 TB drives

2 RAID arrays
14 TB total

5 x 4* TB drives

Several 4TB disks and 2 smaller disks spanned to produce a 4 TB block device
16 TB total

I'm not actually planning on actually doing this because this setup will probably have all kinds of problems, however I do wonder, what would those problems be?

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[–] mlaga97@lemmy.mlaga97.space 3 points 2 years ago

I ran RAID-Z2 across 4x14TB and a (4+8)TB LVM LV for close to a year before finally swapping the (4+8)TB LV for a 5th 14TB drive for via zpool replace without issue. I did, however, make sure to use RAID-Z2 rather than Z1 to account for said shenanigans out of an abundance of caution and I would highly recommend doing the same. That is to say, the extra 2x2TB would be good additional parity, but I would only consider it as additional parity, not the only parity.

Based on fairly unscientific testing from before and after, it did not appear to meaningfully affect performance.