Thank you, Nate.

We actually had a 3Ware raid cage on site and installed it to house the two
drives.

Pulled the source drive to test fail over and this time the OS didn't
immediately crash. But after, roughly, two minutes the machine became
unresponsive except for the mouse.  Interestingly, it appeared that what
ever was cached still worked while "cat /proc/mdstat" didn't show a drive
failure.

Any ideas on how to make Linux RAID 1 failover work with IDE drives.

Many thanks in advance.


James D. Parra
[EMAIL PROTECTED]


-----Original Message-----
From: nate [mailto:[EMAIL PROTECTED]
Sent: Wednesday, March 05, 2003 11:59 AM
To: [EMAIL PROTECTED]
Subject: Re: RAID-1 automatic failover failed


James D. Parra said:
> Hello,
>
> Created a RAID -1 of three partitions; \boot, \, and a swap partition with
> two identical drives. Mirroring works well but after pulling the source
> drive the OS freezes.
>
> Is there a way to make a RAID -1 automatically failover to the target
> drive if the source drive fails?
>
> Any suggest would be greatly appreciated.

this is a hardware problem, not software. sounds like your hardware
does not support hot swap. Most hardware does not. The most common
hot swap configuration is using 80pin SCA SCSI drives using a hotswap
backplane. Recently I configured such a system, and yanked a drive while
the system was running and the system didn't skip a beat. Plugged it
back in, ran a few commands and the array resynched.

I most DEFINATELY would NOT reccomend using those $20 IDE disk cages,
some of which advertise "hot swap". If your using IDE disks there
are some hot swap capable cages, the only one I can think of at the
moment comes from 3ware. Not sure on the cost.

system freeze is a typical response for the hardware having a non
recoverable error.

nate





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