Hi all

I have linux server with following specifications

Red Hat Enterprise Linux ES release 4 update 5
Linux 2.6.9-55.0.2.ELsmp #1 SMP Tue Jun 12 17:59:08 EDT 2007 i686 i686 i386 GNU/Linux

I have mounted a external HDD on that for backup purpose.
I dont know why Some time this HDD goes read only.

fstab entries are as

/dev/sdc1 /backup ext3 defaults,rw 0 0

please let me possible reasons and solution for it.

Here are the Datails of DISC

Disk /dev/sdc: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdc1 1 19457 156288321 83 Linux

-------

class: HD
bus: SCSI
detached: 0
device: sdc
driver: ignore
desc: "Seagate FreeAgent Go"
host: 3
id: 0
channel: 0
lun: 0
generic: sg4

----------------------
Disk /dev/sdb: 730.8 GB, 730815528960 bytes
255 heads, 63 sectors/track, 88849 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 13 104391 83 Linux
/dev/sdb2 14 27657 222050430 83 Linux
/dev/sdb3 27658 40023 99329895 83 Linux
/dev/sdb4 40024 88849 392194845 5 Extended
/dev/sdb5 40024 42573 20482843+ 83 Linux
/dev/sdb6 42574 44485 15358108+ 83 Linux
/dev/sdb7 44486 45007 4192933+ 82 Linux swap

Two Disc are connected to server
device sdb has no issues it is working properly OS has been installed on it.

Device sdc goes read only at the time when my Backup starts to create Directories and tar files on it

It's impossible for us to give you any answers, with so little information. It goes read-only "sometimes"? When? What are you doing when it happens? Same times/days? What? What KIND of external HDD? What interface (USB? Firewire?).

Thanks !!

I have updated the Instance when HDD goes read only and hardware specification.

Also My doubt is there might be limit on the kernel specified to access the DISCsize.

Here are the Datails of DISC
Belo is the out put of fdisk -l

Disk /dev/sdc: 160.0 GB, 160041885696 bytes
255 heads, 63 sectors/track, 19457 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdc1 1 19457 156288321 83 Linux

-------
Out Put of cat /etc/hwconf for the USb

class: HD
bus: SCSI
detached: 0
device: sdc
driver: ignore
desc: "Seagate FreeAgent Go"
host: 3
id: 0
channel: 0
lun: 0
generic: sg4

----------------------

fdisk -l
Disk /dev/sdb: 730.8 GB, 730815528960 bytes
255 heads, 63 sectors/track, 88849 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 13 104391 83 Linux
/dev/sdb2 14 27657 222050430 83 Linux
/dev/sdb3 27658 40023 99329895 83 Linux
/dev/sdb4 40024 88849 392194845 5 Extended
/dev/sdb5 40024 42573 20482843+ 83 Linux
/dev/sdb6 42574 44485 15358108+ 83 Linux
/dev/sdb7 44486 45007 4192933+ 82 Linux swap

Two Disc are connected to server
device sdb has no issues it is working properly OS has been installed on it.

Device sdc goes read only at the time when my Backup starts to create Directories and tar files on it