[Semibug] RAID 0 or 1 for OpenBSD
josh at jggimi.net
Fri Jul 9 07:33:58 EDT 2021
On Thu, Jul 08, 2021 at 08:20:52PM -0600, Jonathan Drews wrote:
> ... I'm looking for solutions to speed up
> backups with dump (man -s 8 dump).
There are several technologies that could be used to take
a point-in-time and consistent image of data, and then
back up the image while production continues on. RAID
could be used as a component a solution, but is not
itself a solution. An example:
1. Quiesce the system(s) using a RAID 1 array.
2. "Split" the RAID 1 array, leaving production on-line
and a stable, unchanging mirror off-line.
3. Continue production while backing up the off-line
half of the array.
4. "Join" the RAID 1 array, rebuilding changes from
production back onto the returning mirror.
The important things to keep in mind are:
* The checkpoint needs to be consistant to avoid data
* During the "split" and backup, a standard RAID 1 array
such as used in this example would have no redundancy.
More information about the Semibug