gmirror, gpart and MBR vs GPT in the Handbook
jcigar at ulb.ac.be
Tue Dec 3 09:26:11 UTC 2013
On Mon, Dec 02, 2013 at 08:56:13AM -0700, Warren Block wrote:
> On Mon, 2 Dec 2013, Julien Cigar wrote:
> > If you want to use GPT with gmirror you may want to mirror each
> > partition instead of the whole disk.
> > For example on my box I have the following: https://dpaste.de/Rb3S
> There are a couple of potential problems with that. The big one is when
> a disk fails and is replaced. If you're not careful, the rebuild of all
> those mirrored partitions will start at the same time. Head contention
> will bring that to a near-standstill. It also puts a heavy load on the
> drive that still works. Hopefully it is not the same model and age as
> the one that failed, or its "warranty timer" may also be close to
That's true, I turned off autosynchronization of stale components to
avoid this kind of bad scenario ..
> A less-serious problem is that only the partitions are mirrored. That
> leaves out metadata like the partition tables and bootcode, but those
> typically do not change very often and might not be a problem. The
> admin has to remember to manually install such things on a new
> replacement disk, though.
It's just a matter of gpart backup / gpart restore, right ?
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