Software raid VS hardware raid
Mark Felder
feld at feld.me
Tue Jan 29 17:02:36 UTC 2013
On Tue, 29 Jan 2013 08:57:31 -0600, Warren Block <wblock at wonkity.com>
wrote:
> As far a gmirror is concerned, yes, drives can be removed and new drives
> inserted while the mirror is running. Hot swap is more of an issue with
> the hardware. I have not tried it with SATA drives, although I think it
> should work.
> The Handbook chapter on gmirror talks about the problems with GPT and
> GEOM metadata. In short: right now, they conflict. It's possible to
> mirror GPT partitions, but be aware that if you mirror more than one
> partition on a drive, a rebuild after replacing a drive could thrash the
> heads as mirrors are rebuilt simultaneously.
>
> http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/geom-mirror.html
Why isn't gmirror more intelligent? I hate to use Linux as an example, but
mdadm won't simultaneously rebuild multiple RAID sets if they use the same
physical providers to prevent this. Could this be added as a feature? Even
a sysctl toggle?
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