Looking to build a media server with TrueNAS. I would have 1 pool with 3 or 4 HDDs to start and then expand the pool when finances allow. Have I got the calculations, correct? I would also have 2x 500gb SSD for OS / Cache. I’m aware of storage overheads, these are just rough.
Each HDD is 18tb
ZFS1 pool - 3 HDD x 18 = 54 (54 - 18 = 36tb)
OR
ZFS1 pool - 4 HDD x 18 = 72 (72 - 18 = 54tb)
(3x 18 = 54)
(54 - 18 = 36)
(Par drive = 18 (18 + 18 = 36)
Total storage = 36tb
(4x 18 = 72)
(72 - 18 = 54)
(Par drive = 18 (18 + 18 +18 = 54)
Total storage = 54tb
Extending pool
(3x 18 = 54)
(54 - 18 = 36)
(Par drive = 18 (18 + 18 = 36)
Total storage = 72tb (6x 18 HDD with 2x 18 par)
(4x 18 = 72)
(72 - 18 = 54)
(Par drive = 18 (18 + 18 + 18 = 54)
Total storage = 108tb (8x 18 HDD)
Each HDD is 18tb
ZFS1 pool - 3 HDD x 18 = 54 (54 - 18 = 36tb)
OR
ZFS1 pool - 4 HDD x 18 = 72 (72 - 18 = 54tb)
(3x 18 = 54)
(54 - 18 = 36)
(Par drive = 18 (18 + 18 = 36)
Total storage = 36tb
(4x 18 = 72)
(72 - 18 = 54)
(Par drive = 18 (18 + 18 +18 = 54)
Total storage = 54tb
Extending pool
(3x 18 = 54)
(54 - 18 = 36)
(Par drive = 18 (18 + 18 = 36)
Total storage = 72tb (6x 18 HDD with 2x 18 par)
(4x 18 = 72)
(72 - 18 = 54)
(Par drive = 18 (18 + 18 + 18 = 54)
Total storage = 108tb (8x 18 HDD)