Re: ORACLE8 NT and RAID5

Raid 0 + 1: stripe then mirror.

    Take 10 discs
    Make 5 into a strip set
    Make the other 5 into a stripe set
    Make the two stripe sets mirror each other     Burn out one disc.

        When the hot spare cuts in all 5 discs in the
        burnt set have to be resilvered - ouch.

    Prior to version 3 of Veritas (I think) which includes     Sun's LVM system this was the only mirror/strip     combination on offer.

Raid 1 + 0: mirror then stripe

    Take 10 discs
    Create 5 pairs of mirrors
    Create one stripe set from 5 mirrors     Burn out one disc

        When the hot spare cuts in, only the one
        disc in the damaged mirror pair needs to
        resilver.

--

Jonathan Lewis
Yet another Oracle-related web site: www.jlcomp.demon.co.uk

volleyball_at_ntr.net wrote in message <379b33b7.315260269_at_news.ntr.net>...
>On 20 Jul 1999 14:36:05 GMT, "Kaboel Karso" <karso_at_kpn.com> wrote:
>
>
>Good point - I have heard someone else talk about 1+0 versus 0+1. I
>think 0+1 referres to a grossly misconfigured system where the drive
>are mirrored on a single channel and stipped either on the single
>channel or across multiple channles. Is this what you mean by Raid 01?
>(BTW - I have seen this setup - Slow performance and a big issue when
>a drive dies.)
Received on Sun Jul 25 1999 - 14:56:39 CDT