# [OmniOS-discuss] performance penalty of a slow mirror

Tobias Oetiker tobi at oetiker.ch
Thu Aug 15 07:07:32 UTC 2013

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    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.
    > _______________________________________________
    > OmniOS-discuss mailing list
    > OmniOS-discuss at lists.omniti.com
    > http://lists.omniti.com/mailman/listinfo/omnios-discuss
    >
    >

    --
    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

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