[OmniOS-discuss] performance penalty of a slow mirror

[Tobias Oetiker]

Hi Michael,

Today Michael Mounteney wrote:

> Hello, as my current OmniOS server doesn't have removable disks, I've
> added an external USB2 HDD as a mirror, so that in the event of fire or
> holiday, the external disk can be taken away as a backup.
>
> How does OmniOS deal with a very slow mirror ?  Does it perform any
> measurements to work out that it should always write to the other
> mirror first, or does it do a 'fair sharing' or writes ?
>
> This is a SuperMicro 5017C-LF
> (http://www.supermicro.com/products/system/1u/5017/sys-5017c-lf.cfm )
> with 2 x 500 GiB 2.5" drives mirrored internally, plus the external
> mirror.  The machine has only USB-2 sockets, not USB-3.

wouldn't you rather want to use zfs snapshots with send/recv to
keep a copy on your external drive ?

cheers
tobi

>
> Michael.
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>
>

-- 
Tobi Oetiker, OETIKER+PARTNER AG, Aarweg 15 CH-4600 Olten, Switzerland
http://it.oetiker.ch tobi at oetiker.ch ++41 62 775 9902 / sb: -9900