Worth to try 5.2? (had problems with 5.1)

Doug White dwhite at gumbysoft.com
Fri Jan 23 15:06:45 PST 2004

On Fri, 23 Jan 2004, Doug White wrote:

> On Fri, 23 Jan 2004, Doug White wrote:
> > I'm not getting the panic though, although this is using IDE disks and not
> > SCSI. I can hook up a couple to it and run a quick test, since it has a
> > MPT chip thats unused.
> Ok, so I hooked this up, enabled the builtin mirror, and got the panic.  I
> didn't let the disks sync first, so I'm going to allow that to complete
> then try again. I have a sinking feeling that the controller doesn't keep
> track of the status of the mirror pairs too well and will allow you to
> read blocks off the unsynchronized side of the mirror, which will result
> in bizarre panics.

Under further exploration, it appears the mirror feature requires driver
support. The FreeBSD driver does not offer this at this time. The latest
linux driver has special considerations for RAID volumes, which involves
knowing about the underlying devices, and thats not a good sign.

I don't get any panics when the mirror is not configured.

Doug White                    |  FreeBSD: The Power to Serve
dwhite at gumbysoft.com          |  www.FreeBSD.org

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