Hard drive failures (related to SUNOS 4.1??)

[DENIS%EVAX.P-E-T.Mankato.MSUS.EDU at cunyvm.cuny.edu]

I have recently upgrade our SUN sparc stations (SS1's). Shortly after I
did that one of the stations would not boot giving me the message:

        Booting from: sd(0,0,0)vmunix
        Can't read disk label
        Can't read boot blocks
        Boot load failed

This was my system disk sd0. I tried booting from st(0,0,4) and the
following message appeared on the screen (during the boot):

        sd0 at esp0 target lun 0
        sd0:  unable to read label
        sd0: Vendor 'Quantum', product 'P10555', (unknown capacity)
        sd1 at esp0 target lun 0
        sd1: <Quantum ProDrive 1055 cyl 974 alt 2 hd 6 sec 357
        more messages then
        panic: hat_unlock
        Syncing files systems... panic: hat_unlock
        more messages

I tried formating the disk but got the message:

        searching for disks ... sd0: offline

Today (about a week later) a second sparc has the exact same disk problems
on sd0.  Has anybody experienced something like this?? Could this be
related to the new 4.1 operating system??  Any ideas how to fix the drives
or do they need to be repaired??

Denis Becker
Mankato State University
denis at msus1.bitnet
denis at msus1.msus.edu