On 12/13/2017 08:29 AM, cagsm wrote:
My use case here is also not constant availablity,
when a disk needs
to be replaced, so be it, but I don't want to lose my data that I can
not ever read certain parts of it again or such stuff.
Unless you just have spare disks around and want to play with the additional
raid levels, a RAID-1 pair is a great start. With mdraid, and RAID-1, unless
both drives go at the same time (something I haven't experienced in 17 years),
simply fail/remove the dead one, and then add the new one in it's place and it
will automatically sync.
Another consideration is 'scrubbing' and disk size. With platters, it takes
about an hour per Terabyte to scrub. (which is recommended weekly)
I have 4T (8T total in 4 disks in 2 RAID-1 sets) and it takes about 4.5 hours
to scrub. I'm not sure I would want to have to scrub 20T weekly.
And always remember, RAID is just a tool, not a guarantee of data safety. Data
not backed up is data lost.
David C. Rankin, J.D.,P.E.
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