RE: Software RAID-1 on FreeBSD 5.4

From: Ted Mittelstaedt (tedm_at_toybox.placo.com)
Date: 06/30/05

  • Next message: Alan Jay: "RE: ATA_Identify timeout ERROR - using Tyan S5350 with FreeBSD 5.4 (problems booting - SATA hard disk not recognised) -" 
    To: "ptitoliv" <ptitoliv@frenchsuballiance.cjb.net>, <freebsd-questions@freebsd.org>
Date: Thu, 30 Jun 2005 02:02:18 -0700

    One last comment for you on software mirroring,

      While I am not trying to disparage the various efforts, software
    mirroring provides limited redundancy unless the hard drives
    are on separate busses.

      If you do the common thing of putting 2 IDE drives as the master and
    slave on the primary IDE controller, than all it takes is a buss error
    on the IDE bus and you have scrambled the data on both hard drives.

      The same problem exists if you setup a ccd or vinum or gmirror
    or whatever on a SCSI controller where the disks are all on the same
    SCSI bus.

      The same problem also exists on SATA controllers, and on cheaper
    hardware RAID cards where the disks are on a single IDE bus.

      This is why hardware RAID controllers are quite often better as
    the better ones contain multiple interfaces.

    Ted

    >-----Original Message-----
    >From: owner-freebsd-questions@freebsd.org
    >[mailto:owner-freebsd-questions@freebsd.org]On Behalf Of ptitoliv
    >Sent: Wednesday, June 29, 2005 12:56 PM
    >To: freebsd-questions@freebsd.org
    >Subject: Re: Software RAID-1 on FreeBSD 5.4
    >
    >
    >Hello again,
    >
    >Thank you for all your answers ! I am going to look at gmirror and ccd.
    >But I have a last question. My disks are differents. One is a Maxtor
    >detected with a 111 GB capacity and the other is a Seagate detected with
    >a 114 GB capacity. Will I have problems trying to use RAID with this
    >configuration ?
    >
    >Best regards,
    >ptitoliv
    >
    >_______________________________________________
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    >http://lists.freebsd.org/mailman/listinfo/freebsd-questions
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  • Next message: Alan Jay: "RE: ATA_Identify timeout ERROR - using Tyan S5350 with FreeBSD 5.4 (problems booting - SATA hard disk not recognised) -"

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