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[ale] backup/restore mail from USB external drive

Why should you avoid raid 5 or 6 when using large hard disks? What Raid
configuration would you recommend for 12 HDDs each 2 TB in a NAS?
On Feb 12, 2014 6:40 PM, "Jeff Hubbs" <jhubbslist at att.net> wrote:

>  On 2/12/14, 5:00 PM, Lightner, Jeff wrote:
> <snip>
> You really should be using RAID6 or RAID10 rather than RAID5 as it is even
> more redundant (i.e. can survive 2 disks failures).
> And you shouldn't be using RAID5 or RAID6 at all if your drives are
> 750-1000GB or larger.
> Mail and database servers would be two good places to make use of
> snapshotting filesystems.  Note that some email systems that use message
> stores go insane if the message store is not in the state that the rest of
> the email system presumes it's in, so you have to make sure that your
> backup/recovery scheme doesn't capture messages and message metadata/index
> in different states.
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