Re: Raid 5 on Fedora 4 working with SATA ?

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On Wed, 2006-02-01 at 09:45 +0000, Terry Barnaby wrote:
> Hi,
> 
> I have just set up a Raid 5 disk array using 4 SATA disks on Fedora 4.
> To test the setup I unplugged the SATA cable from one of the disk drives.
> I was expected the system to carry on with messages from the Raid system
> indicating that there was a disk drive down.
> 
> However the Raid 5 partition became completely inaccessable after un-plugging
> the drive. The kernel reported disk errors but there was no error messages
> from the Raid system and "mdadm -Q --detail /dev/md2" reported that there
> was no problems with the Raid array.
> 
> When I rebooted the system (needed a reset) the Raid system reported that
> one disk was down and the partition became readable again.
> 
> It appears that the default configuration of the Raid 5 system does not
> handle a complete drive failier during up-time. I presume it may respond to
> disk errors from a disk drive that is connected but once disconnected the
> Raid system appears to ignore errors.
> 
> Is there a configuration option to allow the Raid system to respond to
> a completely broken drive or cable ?
> 
> Terry
> 

A. Are you sure your machine/controller hot plug? SATA doesn't support
it by default. (You'll need special drive enclosures and
hot-plug-supporting controller.
B. Can you post your complete machine configuration?

Gilboa


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