Software RAID-1 on FreeBSD 5.4
tedm at toybox.placo.com
Thu Jun 30 09:02:22 GMT 2005
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
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.
>From: owner-freebsd-questions at freebsd.org
>[mailto:owner-freebsd-questions at freebsd.org]On Behalf Of ptitoliv
>Sent: Wednesday, June 29, 2005 12:56 PM
>To: freebsd-questions at freebsd.org
>Subject: Re: Software RAID-1 on FreeBSD 5.4
>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
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