ACFS mount I/O error

df -h

Filesystem	size   used  avail capacity  Mounted on
/dev/dsk/c0d0s0	16G   8.2G   7.4G	53%	/
/devices	0K	0K	0K	0%	/devices
ctfs	0K	0K	0K	0%	/system/contract
proc	0K	0K	0K	0%	/proc
mnttab	0K	0K	0K	0%	/etc/mnttab
swap	87G   1.1M	87G	1%	/etc/svc/volatile
objfs	0K	0K	0K	0%	/system/object
sharefs	0K	0K	0K	0%	/etc/dfs/sharetab

/platform/SUNW,T5240/lib/libc_psr/libc_psr_hwcap2.so.1

16G   8.2G   7.4G

53%

/platform/sun4v/lib/libc_psr.so.1

/platform/SUNW,T5240/lib/sparcv9/libc_psr/libc_psr_hwcap2.so.1

16G   8.2G   7.4G

53%

/platform/sun4v/lib/sparcv9/libc_psr.so.1