Problems with root filesystem writes

From: Aaron Taylor (kusoneko@gmail.com)
Date: Mon Feb 27 2006 - 02:16:21 EST


Hi All,

I've got a problem with a new Sun Blade 1000 machine I setup. It's
Solaris 10 update 1(1/06). Nobody, including root, can write to the
root filesystem. Other slices are fine. People can write to /usr,
/home, etc, etc, etc just fine.

/ is mounted read-write as shown in the "mount" command with /usr for
comparison:

/ on /pci@8,600000/SUNW,qlc@4/fp@0,0/disk@w21000004cfe6917c,0:a
read/write/setuid/devices/dev=1d80008 on Wed Dec 31 16:00:00 1969
/usr on /dev/dsk/c1t1d0s3
read/write/setuid/devices/intr/largefiles/logging/xattr/onerror=panic/dev=1d8
000b
on Sun Feb 26 14:43:17 2006

However, comparing it to /usr, you can see several differences. First,
it's the actual hardware path that is mounted instead of the link in
/dev which then normally points to the hardware path in /devices.
Second, it shows the mount date as the beginning of the UNIX clock. I
would think that even if the clock was starting when the system first
got AC power, it would at least be 15-20 seconds of runtime until it
got around to mounting disks. You can also see logging is not enabled
on /. I was under that belief that UFS logging was enabled by default
on all UFS filesystems in Solaris 10.

The appropriate entries out of /etc/vfstab:

/dev/dsk/c1t1d0s0 /dev/rdsk/c1t1d0s0 / ufs 1
 no -
/dev/dsk/c1t1d0s3 /dev/rdsk/c1t1d0s3 /usr ufs 1
 no -

I tried reinstalling the OS and the same behaviour is occuring on both
installs.

Does anyone have any ideas what is causing this?

Thanks,
   -Aaron Taylor
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