From: Wagner, Ronald P (ronald.p.wagner@lmco.com)
Date: Tue Jun 10 2003 - 11:15:15 EDT
We have a number of identical system using 4100 servers, Tru64 4.0d, and a
split SCSI bus controller for 8 disks arranged in two shelves. One site,
which is the only one running on 50 Hz. power, has a problem copying files
from one disk to another across the split bus.
In one case we use
cd /
vdump -0f - -D . | vrestore -xf - -D /broot
cd /usr
vdump -0f - -D . | vrestore -xf - -D /busr
to make a copy of the system disk. The two disks are on different SCSI
controllers. We make the appropriate changes to /etc/fstab and so on, but
still the disk copied to is not bootable. When we examine some of the
files, we notice that some 256 byte blocks are not the same between the file
copied from and the file copied to. Of course, the checksums do not match.
We noticed this anomaly on very large files (such as /vmunix).
The corrupted files also happen on individual file copies (i.e. the cp
command).
We have swapped out most of the hardware in the SCSI chain with no
improvement. Anyone have any clues what might be happening?
P.S. This system is in Germany and we can only troubleshoot by telephone.
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