HP server with RADI, file system may become read-only after some time of running. Rebooting the system will recover it, but read-only again after a period of time.

Here's some information:

[zero@HP380 ~]$ uname -a
Linux HP380.xxxx 2.6.32-358.el6.x86_64 #1 SMP Tue Jan 29 11:47:41 EST 2013 x86_64 x86_64 x86_64 GNU/Linux

[zero@HP380 ~]$ mount
/dev/sda3 on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda1 on /boot type ext4 (rw)
/dev/sdb1 on /home type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)

[zero@HP380 ~]$ mkdir asdf

mkdir: cannot create directory `asdf': Read-only file system

[zero@HP380 ~]$ dmesg|grep error

sd 0:0:0:1: [sdb] Add. Sense: Unrecovered read error

EXT4-fs error (device sdb1) in ext4_reserve_inode_write: Journal has aborted

EXT4-fs error (device sdb1) in ext4_free_blocks: Journal has aborted

EXT4-fs (sdb1): delayed block allocation failed for inode 14550561 at logical offset 0 with max blocks 1573 with error -30

EXT4-fs error (device sdb1) in ext4_da_writepages: Journal has aborted

EXT4-fs error (device sdb1): ext4_journal_start_sb: Detected aborted journal

The HP's server maintaining tools does not detect any problem for the raid.

"Unrecovered read error" - Is it possible a disk hardware failure?
How can I fix it ? of course not a temporary fix by rebooting...

Run:
and post the output here.

Why SMART is not supported? How to support SMART?

If the device does not support SMART then you cannot know for sure if it is failing.

If these errors are not caused by power outage then I would assume that disk is failing and replace the drive.

The message that SMART is not supported might not be literally true. Enter the BIOS when you switch on the computer and go to the hard-drive section and see if there is an option to activate SMART — it might just be switched off by default.

moreover, after enabling SMART in BIOS, you have to enable it like this as well:
before trying to retrieve report by

From my experience it would say that SMART is not enabled, not that the device doesn't support SMART, but check anyway.

Still cannot find option to enable SMART in BIOS.
But one of the disk's led showed failure state. So it's definitely a disk hardware problem.
Thanks everybody for the advice.

What type of RAID, and what does /etc/fstab have in it.

Just a couple of points that seem to have been missed:

• It doesn't surprise me that the composite RAID device does not support SMART. That is something that would apply to the individual drives.
• Failure of a single drive should not cause any issues for the OS. Continuing on seamlessly in the face of such failures is what RAID is all about.

As there is nothing in the mount output about mdadm devices, this would have to be either hardware RAID or "Fake RAID" in the BIOS. As syg00 requested, more information about the RAID setup is needed.

/dev/sdb is RAID5

#
# /etc/fstab
# Created by anaconda on Fri Jan 24 16:30:02 2014
#
# Accessible filesystems, by reference, are maintained under '/dev/disk'
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info
#
UUID=40232a79-9578-4221-b8f3-81da15e08f6a / ext4 defaults 1 1
UUID=313b9c70-1664-4f48-8dc1-195fadd29116 /boot ext4 defaults 1 2
UUID=673e35f3-9fd1-489b-b01b-4131f5d84851 /home ext4 defaults 1 2
UUID=462dd42d-9a70-4763-ac10-41e2f81dad1c swap swap defaults 0 0
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