[Info-vax] MSA$UTIL experiment - try build mixed SAS/SATA drive RAID mirror set

[Rod Regier]

TLER investigation result:

This is a great article on the topic:
https://www.ixsystems.com/community/threads/checking-for-tler-erc-etc-support-on-a-drive.27126/

Apparently NAS targetted SATA drives are more likely to support and have SCT ERC enabled as factory default.

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Western Digital (SATA) 250GB Scorpio Black WD2500BEXT-75A25TO
"SCT ERC not supported"

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Samsung 850 EVO (SATA) SSD 500GB

SCT ERC (default)
     Read  disabled
     Write disabled

It permits setting it with:

smartctl -l scterc,70,70 /dev/sda

but it reverts to "disabled" when power cycled

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I tried using smartctl to probe scterc status of an
HP 146G 10K SAS SFF drive DG146BABCF (460850-002)
but it returned nothing.

smartctl --all on that same SAS drive works fine so it does process
SMART interrogation requests.

I'm beginning to suspect that SCT ERC is a SATA-specific attribute
unsupported on SAS drives  but I haven't been able to confirm it.