Re: [BackupPC-users] Any procedure for using 2 external harddrives
2012-10-25 12:56:10
On 10/25/2012 12:30 PM, Les Mikesell wrote:
> On Thu, Oct 25, 2012 at 10:38 AM, Timothy J Massey <tmassey AT obscorp DOT
> com> wrote:
>> 1) Constantly mirroring the pool and occasionally breaking the mirror to
>> take it off-site. (Option 1 above). A variation of this would be to take
>> the pool down and make a copy of it, then bring it back up (or use LVM
>> snapshots to reduce the downtime). This variation is left as an exercise
>> for the reader: there are a *lot* of unexpected details in that answer:
>> problems with file-level copy will most likely require block-level copies,
>> LVM snapshots present performance and reliability issues, etc.
> This works, but has the down side of taking most of a day to re-sync
> the replaced mirror with the drives being too busy to be useful for
> much else during that time.
It's not all that bad depending on the size of the drives. I have 1TB
drives in a 3-way md mirror. It takes about 3 hours to re-sync when I
replace a drive. You can let it re-sync during the day when backups
aren't running.
--
Bowie
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