September 4, 20178 yr Current config: 4 x 4TB array 1 x 4TB parity 2 x 480gb SSD cache pool 42% of Array used. - Media Files - Disc Backups/images - Documents Crashplan to cloud and external backups I have another 4TB disk and was planning on using it for added fault tolerance as a parity2. Given the small number of disks, redundancy in both cloud and physical back-ups and near 50% capacity...would it be wiser to increase capacity? Is a dual disk failure during a rebuild, with "only" five data disks a remote enough possibility for the 20% increase of capacity. Thanks, and happy labor day to all.
September 4, 20178 yr Add capacity. Dual failure very unlikely. If you don't have hot-swap the risk of two drives dropping offline (due to cabling being disturbed not drive failure) is higher. This is not dual failure, and is recoverable with expert assistance. However, without such assistance a user is liable to make mistakes and could lose data. Dual parity would help protect from this use case. But with backups in place it your risk of data loss is extraordinarily low, and the worst you might expect is some extra recovery time. Personally I'd not consider dual parity until hitting 20+ drives.
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