RAID and JBOD drives randomly not mounting

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RAID and JBOD drives randomly not mounting

I've got a few different drives in my Mac Pro 2019, from the Promise Disk 8TB drive to some NVME and Raid & JBOD drives. I'm noticing that two of the drives sometimes don't appear at startup - a 4TB RAID (Made up of 4 x 1TB NVME drives on 2 x dual PCIe cards) and a 3TB JBOD (made up of a 2TB NVME and a 1TB NVME).

They never disappear at the same time, and most times they both appear at startup, so it's really random. Also today I noticed that the 4TB RAID disconnected itself whilst the Mac Pro was in sleep.

What's most annoying is when I try to mount them through disk utility, it states "Invalid disk".

Does anyone know why they would randomly appear and disappear? I need to connect them due to having to sync to a 4TB database and a 3TB group of files.

Any help appreciated.

Mac Pro, macOS 12.0

Posted on Nov 25, 2021 12:40 PM

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Answer 1

Nov 25, 2021 5:18 PM in response to Buzzovich

How old are these drives ? The issue could be the Bad Blocks on any member of the RAID set.

My experience has been that drives in a RAID array must continue to be "perfect", or the RAID array first may not Mount, then may be reported as "'degraded" . If you want to keep using it, may need to rebuild a mirrored, or replace drives on a striped array or JBOD.

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Answer 2

Nov 26, 2021 7:34 AM in response to Buzzovich

yes, definitely.

Also, after enabling TRIM, you should do a 'repair disk/First aid' on each array. This will do a 'TRIM unused blocks' at the end, and can preclude slowdowns that could cause your array to be unloaded.

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Answer 3

Nov 26, 2021 7:07 AM in response to Buzzovich

is TRIM enabled?

sudo trimforce enable

https://www.lifewire.com/enable-trim-for-ssd-in-os-x-yosemite-2260789

.

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Answer 4

Buzzovich Author

Level 1

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Nov 25, 2021 11:17 PM in response to Grant Bennet-Alder

The drives are new. A few months old. Same as the pcie cards. When it first happened I reformatted the drives and redid the raid.

The 4TB raid is 4 x 1TB WD Blue SN550 NVME drives. On 2 x Lycom DT-130 Dual PCIe NVMe M.2 SSD Carrier Adapters.

The JBOD is 1TB WD Blue SN550 NVME drive + 2TB Sabrent Rocket Q NVME. Both on Sabrent NVMe M.2 SSD to PCIe Cards with aluminum heat sinks.

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Answer 5

Buzzovich Author

Level 1

5 points

Nov 26, 2021 7:12 AM in response to Grant Bennet-Alder

It's not at present. I thought it was but seems not. Shall I enable this?

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Answer 6

Buzzovich Author

Level 1

5 points

Nov 26, 2021 7:46 AM in response to Grant Bennet-Alder

OK, thanks.

I enabled trim and weirdly when I logged back in the JBOD was missing but it's back again after a restart & I've fire aid'd them so we'll see how they do.

Cheers for your help.

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RAID and JBOD drives randomly not mounting

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