>>> print platform.dist(),platform.uname()
('redhat', '4', 'Tikanga') ('Linux', 'bsnew', '2.6.18-308.el5', '#1 SMP Fri Jan 27 17:17:51 EST 2012', 'x86_64', 'x86_64')

[root@bsnew home]# cat /etc/fstab
/dev/sdb1 /                       ext3    defaults        1 1
LABEL=/boot             /boot                   ext3    defaults        1 2
tmpfs                   /dev/shm                tmpfs   defaults        0 0
devpts                  /dev/pts                devpts  gid=5,mode=620  0 0
sysfs                   /sys                    sysfs   defaults        0 0
proc                    /proc                   proc    defaults        0 0
/dev/sdb5 swap                    swap    defaults        0 0

[root@bsnew home]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sdb1              50G   44G  3.6G  93% /
/dev/sda1              99M   16M   78M  17% /boot
tmpfs                 4.7G     0  4.7G   0% /dev/shm

[root@bsnew home]# fdisk -l
Disk /dev/sda: 131 MB, 131604480 bytes
64 heads, 32 sectors/track, 125 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1         102      104432   83  Linux

Disk /dev/sdb: 66.2 GB, 66262855680 bytes
255 heads, 63 sectors/track, 8056 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1               1        6528    52436128+  83  Linux
/dev/sdb2            6529        8054    12257595    5  Extended
/dev/sdb5            6529        8054    12257563+  82  Linux swap / Solaris

.
.
Buffer I/O error on device sdb1, logical block 1769961
lost page write due to I/O error on sdb1
sd 0:0:1:0: timing out command, waited 360s
sd 0:0:1:0: Unhandled error code
sd 0:0:1:0: SCSI error: return code = 0x06000008
Result: hostbyte=DID_OK driverbyte=DRIVER_TIMEOUT,SUGGEST_OK
mptscsih: ioc0: attempting task abort! (sc=ffff8100b629a6c0)
sd 0:0:1:0:
        command: Write(10): 2a 00 00 d8 15 17 00 04 00 00
mptscsih: ioc0: task abort: SUCCESS (rv=2002) (sc=ffff8100b629a6c0)
Aborting journal on device sdb1.
ext3_abort called.
EXT3-fs error (device sdb1): ext3_journal_start_sb: Detected aborted journal
Remounting filesystem read-only
__journal_remove_journal_head: freeing b_committed_data
EXT3-fs error (device sdb1) in ext3_new_inode: Journal has aborted
ext3_abort called.
EXT3-fs error (device sdb1): ext3_remount: Abort forced by user
ext3_abort called.
EXT3-fs error (device sdb1): ext3_remount: Abort forced by user
.
.

[root@bsnew home]# mount -o remount,rw /dev/sdb1
mount: block device /dev/sdb1 is write-protected, mounting read-only

[root@bsnew home]# mount -l
/dev/sdb1 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw) [/boot]
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

mount: warning: /etc/mtab is not writable (e.g. read-only filesystem).
       It's possible that information reported by mount(8) is not
       up to date. For actual information about system mount points
       check the /proc/mounts file.

[root@bsnew home]# cat /proc/mounts
rootfs / rootfs rw 0 0
/dev/root / ext3 ro,data=ordered 0 0
/dev /dev tmpfs rw 0 0
/proc /proc proc rw 0 0
/sys /sys sysfs rw 0 0
/proc/bus/usb /proc/bus/usb usbfs rw 0 0
devpts /dev/pts devpts rw 0 0
/dev/sda1 /boot ext3 rw,data=ordered 0 0
tmpfs /dev/shm tmpfs rw 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
/etc/auto.misc /misc autofs rw,fd=7,pgrp=2393,timeout=300,minproto=5,maxproto=5,indirect 0 0
-hosts /net autofs rw,fd=13,pgrp=2393,timeout=300,minproto=5,maxproto=5,indirect 0 0

[root@bsnew home]# mount -o rw, remount /dev/sdb1
mount: special device remount does not exist