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Please is it possible to add a third (or more) drives to a mirror (RAID1) in P410? IIUC it would mean creating "Mirror Group 3" (or more). I could not find any way to add a new mirror group using the HP tool ssacli, the documentation only talks about expanding capacity of the mirror (i.e. adding drives to existing mirror group/s), not about increasing redundancy (i.e. creating new mirror groups). Also google search for "Mirror Group 3" returned no results.

My intention is to add a drive, finish recovery/resync, and eventually to remove one of the old drives, all while running the OS using the ssacli tool. Basically replacing the old drives with new ones while keeping redundancy all the time.

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  • replacing the old drives with new ones of the same capacity? Why are you doing that? Commented Aug 16, 2023 at 11:58
  • E.g. to use a new drive with a new lifetime. The existing logical drive capacity is more than sufficient for the given use case. Thanks. Commented Aug 16, 2023 at 12:17

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It's not possible. What you can do however is to switch your RAID card into HBA mode and use Linux MDRAID or ZFS three-way mirrors. HP P410 is an "el cheapo" RAID, so software RAIDs would give you better performance either way (+ZFS will provide you with an on-the-fly meta and metadata integrity checks).

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    Thanks. Do I understand correctly then that the P410 is only capable of 2-drive mirrors? I use MDRAID and ZFS on other servers, but this one is a machine I cannot re-install at will. Commented Aug 16, 2023 at 12:18
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    Yes, this is correct. Two-way mirror. Commented Aug 16, 2023 at 12:25

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