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I recently replaced a failed disk in my 6 disk SSD SoftRAID 4 Array due to a read failure. I notice that another disk expected life is saying 39% and it's not currently the parity disk. Read somewhere (probably here) that the recommendation on setting a Parity disk should be the one with the lowest remaining life. True?
Suppose that's because Parity gets less use. In your system, is that what's called the Primary Disk? When my rebuild is complete, will attempt to pick another Parity/Primary Disk.
Macbook Pro 16" Retina XDR, 2024 M4 Pro internal 2TB storage, 36GB RAM, MacOS 15.6.1 Sequoia, running v8.0 SoftRAID software; Local RAID drives/enclosures: 4M2 OWC Enclosure with 6TB NMe, RAID4 Storage; two external OWC T3 enclosures (2.5TB online storage) populated with JBOD 6x500GB, EVO SSD, RAID 4 array disks/partitions; Local Backup: 2TB.
Posted : 17/04/2024 5:03 pm
SSD's/Flash media wear out on writes, not much on reads. RAID 4 parity disks hold the parity bits, which are written the same amount as the other drives ,but are not read from when reading. So effectively they should wear out the same.
Once you assign a disk to be parity when creating a RAID 4 volume, it will stay the parity disk "forever". You cannot change this without deleting/recreating the volume.
There is no real need to manage the parity drive differently, however.
Posted : 18/04/2024 9:07 am
dmetz reacted
