FStab messed up, root is read only

When upgrading my laptop I lost my fstab completely. So I let it sit, and it boot, however, I can't repair my fstab file because my entire root directory is read only. Is there a way to set the root directory to be writable in the command line? Thanks for any help,
JSkier

Command spit back it couldn't find / in fstab or mtab... I tried 'mount -t reiserfs remount,rw /' and got 'special device remount does not exist'. I'll keep playing and see what happens, if you have other ideas please post, thanks.
JSkier

Similar Messages

[SOLVED]root partition read only after update systemd

After update systemd today, the systemd-remount-fs.service fail to start. Root filesystem is read only I tried add rw to fstab mount option, but the root parition is still read only. I noticed that util-linux package are installed and udev package is dropped , Does it related to my problem?
Please advice me.
Sorry for my bad English.
Update
After downgard util-linux package, the system work again
Update 2
UUID in grub.conf and fstab are inconsistent, Thanks to tomegun for point out this problem.
Last edited by aduser (2012-06-08 04:05:59)

output of systemctl status systemd-remount-fs.service
systemd-remount-fs.service - Remount Root and Kernel File Systems
Loaded: loaded (/usr/lib/systemd/system/systemd-remount-fs.service; static)
Active: failed (Result: exit-code) since Sun, 03 Jun 2012 01:17:42 +0800; 5min ago
Process: 132 ExecStart=/usr/lib/systemd/systemd-remount-fs (code=exited, status=1/FAILURE)
CGroup: name=systemd:/system/systemd-remount-fs.service
fstab
UUID=55326b3a-eec9-498e-8e20-0a7ddd8daf9a / btrfs rw,compress=lzo,space_cache,autodefrag 0 1
UUID=54c17991-716b-496e-a89b-4e978f2d92a4 /boot ext2 defaults 0 1
systemctl
UNIT LOAD ACTIVE SUB JOB DESCRIPTION
proc-sys...misc.automount loaded active waiting Arbitrary Executable File Formats File System Automount Point
sys-devi...d-card1.device loaded active plugged RV630 audio device [Radeon HD 2600 Series]
sys-devi...d-card0.device loaded active plugged 82801I (ICH9 Family) HD Audio Controller
sys-devi...et-eth0.device loaded active plugged RTL8111/8168B PCI Express Gigabit Ethernet controller
sys-devi...dd-sdd1.device loaded active plugged ST3120213A
sys-devi...dd-sdd2.device loaded active plugged ST3120213A
sys-devi...ock-sdd.device loaded active plugged ST3120213A
sys-devi...da-sda1.device loaded active plugged WDC_WD6400AAKS-22A7B0
sys-devi...da-sda2.device loaded active plugged WDC_WD6400AAKS-22A7B0
sys-devi...da-sda3.device loaded active plugged WDC_WD6400AAKS-22A7B0
sys-devi...da-sda5.device loaded active plugged WDC_WD6400AAKS-22A7B0
sys-devi...ock-sda.device loaded active plugged WDC_WD6400AAKS-22A7B0
sys-devi...db-sdb1.device loaded active plugged WDC_WD1002FAEX-00Z3A0
sys-devi...db-sdb2.device loaded active plugged WDC_WD1002FAEX-00Z3A0
sys-devi...db-sdb3.device loaded active plugged WDC_WD1002FAEX-00Z3A0
sys-devi...db-sdb4.device loaded active plugged WDC_WD1002FAEX-00Z3A0
sys-devi...db-sdb5.device loaded active plugged WDC_WD1002FAEX-00Z3A0
sys-devi...ock-sdb.device loaded active plugged WDC_WD1002FAEX-00Z3A0
sys-devi...dc-sdc1.device loaded active plugged ST980811AS
sys-devi...dc-sdc2.device loaded active plugged ST980811AS
sys-devi...ock-sdc.device loaded active plugged ST980811AS
sys-devi...y-ttyS1.device loaded active plugged /sys/devices/platform/serial8250/tty/ttyS1
sys-devi...y-ttyS2.device loaded active plugged /sys/devices/platform/serial8250/tty/ttyS2
sys-devi...y-ttyS3.device loaded active plugged /sys/devices/platform/serial8250/tty/ttyS3
sys-devi...y-ttyS0.device loaded active plugged /sys/devices/pnp0/00:07/tty/ttyS0
-.mount loaded active mounted /
boot.mount loaded active mounted /boot
dev-hugepages.mount loaded active mounted Huge Pages File System
dev-mqueue.mount loaded active mounted POSIX Message Queue File System
sys-kernel-debug.mount loaded active mounted Debug File System
tmp.mount loaded active mounted /tmp
xs-big.mount loaded active mounted /xs/big
xs-dev-\...pace\x5d.mount loaded active mounted /xs/dev/[workspace]
xs-dev.mount loaded active mounted /xs/dev
xs-dl.mount loaded active mounted /xs/dl
xs-file.mount loaded active mounted /xs/file
systemd-...d-console.path loaded active waiting Dispatch Password Requests to Console Directory Watch
systemd-...word-wall.path loaded active waiting Forward Password Requests to Wall Directory Watch
console-...daemon.service loaded active running Console Manager
console-...-start.service loaded failed failed Console System Startup Logging
dbus.service loaded active running D-Bus System Message Bus
[email protected] loaded active running dhcpcd on eth0
gdm.service loaded active running Gnome Display Manager
[email protected] loaded active running Getty on tty1
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-...unt-fs.service loaded failed failed Remount Root and Kernel File Systems
systemd-sysctl.service loaded active exited Apply Kernel Variables
systemd-...-setup.service loaded active exited Recreate Volatile Files and Directories
systemd-...rigger.service loaded active exited udev Coldplug all Devices
systemd-udev.service loaded active running udev Kernel Device Manager
systemd-...nlevel.service loaded failed failed Update UTMP about System Runlevel Changes
systemd-...ssions.service loaded active exited Permit User Sessions
systemd-...-setup.service loaded active exited Setup Virtual Console
dbus.socket loaded active running D-Bus System Message Bus Socket
systemd-initctl.socket loaded active listening /dev/initctl Compatibility Named Pipe
systemd-journald.socket loaded active running Journal Socket
systemd-shutdownd.socket loaded active listening Delayed Shutdown Socket
systemd-...control.socket loaded active listening udev Control Socket
systemd-...-kernel.socket loaded active running udev Kernel Socket
basic.target loaded active active Basic System
cryptsetup.target loaded active active Encrypted Volumes
getty.target loaded active active Login Prompts
graphical.target loaded active active Graphical Interface
local-fs-pre.target loaded active active Local File Systems (Pre)
local-fs.target loaded active active Local File Systems
multi-user.target loaded active active Multi-User
network.target loaded active active Network
remote-fs.target loaded active active Remote File Systems
sockets.target loaded active active Sockets
sound.target loaded active active Sound Card
swap.target loaded active active Swap
sysinit.target loaded active active System Initialization
systemd-...es-clean.timer loaded active waiting Daily Cleanup of Temporary Directories
LOAD = Reflects whether the unit definition was properly loaded.
ACTIVE = The high-level unit activation state, i.e. generalization of SUB.
SUB = The low-level unit activation state, values depend on unit type.
JOB = Pending job for the unit.
74 units listed. Pass --all to see inactive units, too.
grub2 conf
menuentry 'Broken' --class arch --class gnu-linux --class gnu --class os $menuentry_id_option 'gnulinux-ck kernel-true-852c733e-be0d-4375-8668-d7ae049295a9' {
load_video
set gfxpayload=keep
insmod gzio
insmod part_msdos
insmod ext2
set root='hd0,msdos1'
if [ x$feature_platform_search_hint = xy ]; then
search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1 54c17991-716b-496e-a89b-4e978f2d92a4
else
search --no-floppy --fs-uuid --set=root 54c17991-716b-496e-a89b-4e978f2d92a4
fi
echo 'Loading Linux ck kernel ...'
linux /vmlinuz-linux-ck root=UUID=852c733e-be0d-4375-8668-d7ae049295a9 ro rootflags=subvol=broken quiet add_efi_memmap elevator=bfq
echo 'Loading initial ramdisk ...'
initrd /initramfs-linux-ck.img
The update packages
core/btrfs-progs 0.19.20120328-2 2 -> 3
core/device-mapper 2.02.95-4 4 -> 6
core/cryptsetup 1.4.2-1 1 -> 2
core/gpm 1.20.6-7 7 -> 8
core/lvm2 2.02.95-4 4 -> 6
extra/libglapi 8.0.3-1 1 -> 2
extra/libgl 8.0.3-1 1 -> 2
extra/ati-dri 8.0.3-1 1 -> 2
extra/bluez 4.99-2 2 -> 6
extra/consolekit 0.4.6-3 3 -> 4
extra/gvfs 1.12.3-1 1 -> 2
extra/gvfs-obexftp 1.12.3-1 1 -> 2
extra/libatasmart 0.18-1 1 -> 2
extra/libcanberra 0.28-4 4 -> 5
extra/libpulse 2.0-1 1 -> 2
extra/libcanberra-pulse 0.28-4 4 -> 5
extra/mesa 8.0.3-1 1 -> 2
extra/pulseaudio 2.0-1 1 -> 2
extra/xf86-video-ati 6.14.99-0.20120517 0.20120517 -> 1.20120517
community/libvirt 0.9.12-7 7 -> 8
community/ttf-ubuntu-font-family 0.80-2 2 -> 3
multilib/lib32-libglapi 8.0.3-3 3 -> 3.1
multilib/lib32-libgl 8.0.3-3 3 -> 3.1
==> Software upgrade (new version) :
core/util-linux 2.21.1-2 -> 2.21.2-1
core/e2fsprogs 1.42.2-2 -> 1.42.3-1
core/libpipeline 1.2.0-2 -> 1.2.1-1
core/libsystemd 44-7 -> 184-2
core/procps-ng 3.3.2-2 -> 3.3.3-1
core/systemd 44-7 -> 184-2
core/systemd-sysvcompat 3-1 -> 184-2
extra/pixman 0.24.4-1 -> 0.26.0-1
extra/xorg-server-common 1.12.1.902-1 -> 1.12.2-1
extra/xorg-server 1.12.1.902-1 -> 1.12.2-1
community/libuser 0.57.1-2 -> 0.57.6-1
community/os-prober 1.49-3 -> 1.53-1
community/systemd-arch-units 20120412-6 -> 20120528-3
repo-ck/linux-ck-corex 3.3.7-1 -> 3.4-1
repo-ck/linux-ck-corex-headers 3.3.7-1 -> 3.4-1
==> New package :
core/systemd-tools 184-2 (required by systemd)
Does the systemd not support btrfs subvolume as root partition??
Last edited by aduser (2012-06-02 17:45:39)

Darwin/BSD on Bootup and Root Device: Read-only

I was if someone can help me out, My G5 boots straight into Darwin... When in single user mode I notice my 'root device is mounted read-only' is this a default setting?
If someone can cross reference with their G5 i would appriciate it as I suspect that this is the cause that boots into Darwin.
I have had a suggetsion to reset the PRAM, But before i do that, I would like narrow down the problem. A diagnosis of the system log is avaiable here.
http://discussions.apple.com/message.jspa?messageID=4097429#4097429
I would appreciate any help and suggestion.
Thanks in advance

Yes!!! I have escaped Darwin 'dark chambers', i never thought i'd be so glad to see a login window. but not fully out of the woods yet!
Thankyou Wade for your assistance and pointing me in the right direction, i followed your 2nd suggestion but it still booted into Darwin so i then looked into the code you gave me and found this page
http://docs.info.apple.com/article.html?artnum=106464
And followed steps 5 - 6 (chmod 1775) and it booted correctly. nice man
Small problem: - Whilst on the quest to conquer Darwin i managed to start up Setup Assistant where it prompt me user details and information in which i created a new user (unknowingly), now the login window just shows that 1 (new)user, but the previous users are still stored in a folder called Users in (HDD>Users) any chance you may know how i can reactivite them as full users without recreating new users and copying their files across?
Once again thanks Wade.

Remounting Root Filesystem Read-only, what for?

Hi.
I have question. What really for while rebooting/halting system root filesystem is remounted? One second before all filesystems are unmounted. Why it has to be mounted when shutting off the computer.
Thanks in advance.

alexpnx wrote:I have a question on a similar topic... How unsafe is it if the system is rebooted or shutdown without unmounting samba shares? Can the shares be corrupted?
I think the file(s) you're writing to during shutdown can be corrupted (not all corrupted, but simply unfinished saved), if you write there at all, but not anything else as the partition is still up on the host and the host takes care of metadata and stuff - it's worse with local partitions where metadata and stuff can be saved uncompletely, which can lead to files disappearing all over the filesystem, some old files showing up again etc.
Can someone else confirm this?

WebDAV how to make root folders read only but contents writable

Hi everyone.. Thanks in advance to anyone who can help me out..
1 PERMISSIONS
I have a working WebDAV server. In each realm (or user account) they have a setup that mocks their home folder, ie, Documents, Movies, Websites, etc.
How can I modify the permissions so that these root folders cannot be deleted, but they can obviously have items added/deleted inside of them?
2 QUOTAS
Is there anyway to add quotas to WebDav accounts?
Thanks a lot!
-Mel

sorry guys..
Just figured out how to sort out the permissions.. You need to modify the WWW user the way you would normally set the standard user's permissions..
Any help on setting the quotas?
Thanks!
-Mel

[Solved]Root filesystem read-only at boot

Hi,
I can't boot arch. Root filesystem is mounted ro, so nothing works properly. Last boot I make a pacman -Syu without incidences. A few weeks ago I make manual intervention (filesystem upgrade - manual intervention required from latest news). I think that last new (Users of unofficial kernels must enable devtmpfs support) is not the problem since I don't complile the kernel.
dmesg show 2 mount operations to /dev/sda3 (my root partition, EXT4 fs).
mtab have 2 entrys with /sda3. The last shown "ro" flag, and some strange parameters for me .
Maybe is a disk problem? How can I remove this flag, or remount in rw mode?
umount -f don't work.
I use a dual boot with GRUB, and second system is W7.
Thanks in advanced.
Last edited by HermesT (2012-01-14 19:05:56)

Some extra info:
from dmesg
[ 1.237581] sda: sda1 sda2 sda3 sda4 < sda5 >
[ 1.829594] EXT4-fs (sda3): mounted filesystem with ordered data mode. Opts: (null)
[ 5.722599] EXT4-fs (sda3): re-mounted. Opts: user_xattr,acl,barrier=1,data=ordered.
mtab
rootfs / rootfs rw 0 0
proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0
/sys /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0
udev /dev devtmpfs rw,nosuid,relatime,size=10240k,nr_inodes=215507,mode=755 0 0
/run /run tmpfs rw,nosuid,nodev,relatime,size=10240k,mode=755 0 0
/dev/sda3 / ext4 ro,relatime,user_xattr,acl,barrier=1,data=ordered 0 0
devpts /dev/pts devpts rw,relatime,mode=600,ptmxmode=000 0 0
shm /dev/shm tmpfs rw,nosuid,nodev,relatime 0 0
/dev/sda1 /media/SYSTEM fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096 0 0
/dev/sda2 /media/COMPAQ fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096 0 0
/dev/sda5 /media/Almacen fuseblk rw,nosuid,nodev,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096 0 0
* please, note that rootfs (?) is the same partition as /dev/sda3, like can be seen in df output.
df
S.ficheros 1K-bloques Usado Disponible Uso% Montado en
rootfs 21096088 12132788 7891664 61% /
udev 10240 0 10240 0% /dev
/run 10240 252 9988 3% /run
/dev/sda3 21096088 12132788 7891664 61% /
shm 1550516 0 1550516 0% /dev/shm
/dev/sda1 102396 25744 76652 26% /media/SYSTEM
/dev/sda2 54772576 36097780 18674796 66% /media/COMPAQ
/dev/sda5 548819964 142760132 406059832 27% /media/Almacen

Arch is mounting / as read-only post-install

Okay, so I have no idea what I'm missing (I've done several Arch installs.) Machine is i686, no unusual hardware, and it's had Arch installed on it in the past. I run through the configuration, partitions, packages, etc., and when I reboot, Arch mounts my root as read-only..
Any ideas as to why this would be happening?

I understand, and thanks for your help. Fortunately I had just installed the system and didn't have anything valuable on it; Arch installs so fast that I figured it would be faster for me to run the install again and verify that my fstab was correct rather than try and chroot in

I want to mount / partition Read-Only !

I have Arch installed on my Acer Aspire One... and it works great on this little machine!
The Acer One has no hard disk, but uses SSD, so to reduce writes to disk i use EXT2, I have my /home on a separate SD card, and I mounted log and temp directories on tmpfs:
/var/log, /var/tmp, /tmp, /var/cache/pacman/pkg .
now i would like to mount the root partition (/) read only.
the reason is that i want that filesystem (EXT2) to be safe in case of improper power-off or any other disaster ...
this guide for Opensuse shows how to take care of resolv.conf and mtab files (which are, I suppose, the only files that need to be writable, after i moved the log and temp directoryes in tmpfs and the home on SD card)
http://en.opensuse.org/How-To_Make_the_ … _read-only
but then the guide advises to change some configuration files, so that the sistem doesn't remount the root partition read-write after fsck.
unfortunately the files named in the gyuide are related to Suse, and i didn't find them in Arch...:/
In fact i tried to add the "ro" option to the / partition in my /etc/fstab and i rebooted the system, but as root i can still write to the partitions..
Ideas and Info ..?!
THX
xirtyllo

Other post here. http://bbs.archlinux.org/viewtopic.php?id=65414
Closing

NFS for read only backups @ 127.0.0.1

Hi,
I am interested in Mike Rubel's idea of mounting a backup disc read/write within /root/ and read only for normal use within /. I am however a total first timer with NFS and keep get the following error when trying to mount the backup folder 'vault'.
# mount -r -t nfs 127.0.0.1:/root/vault /vault
mountfs: access denied by server while mounting 127.0.0.1:/root/vault
Here is what my /etc/exports file looks like:
/root/vault 127.0.0.1(secure,ro,no_root_squash,subtree_check)
I only added the 'subtree_check' option in to stop from winging when I ran 'exportfs -r'. Does anyone know how I can grant the proper permissions?
http://www.mikerubel.org/computers/rsyn … /#ReadOnly
Regards,
ellis

Oh and as a P.S: I should add that I am using nfs-utils and rpcbind as recommended in the Wiki.
https://wiki.archlinux.org/index.php/NFS

[SOLVED] Root mounted as "Read-only filesystem". mkinitcpio issue?

I am currently in the middle of setting up system encryption with LUKS. I have been making good progress so far, but I do have one remaining issue.
After typing my LUKS password, the Linux kernel starts to complain that root is a read-only filesystem. "Starting NetworkManager... cannot touch file XYZ: Read-only filesystem". When it has finally finished booting, I am dropped into a TTY. I can log in and cat my files, but I cannot write to any files our use any programs that do (like pacman).
I wonder if this is an mkinitcpio issue, but I am not sure. For whatever it's worth, here's my basic setup:
* /dev/sda1: Boot
* /dev/sda2: Swap
* /dev/sda3: Root (LUKS/ext4)
* menu.lst looks like this
* /etc/fstab contains this line:
/dev/mapper/root / ext4 defaults 0 1
* /etc/mkinitcpio.conf contains these lines:
MODULES="ext4"
HOOKS="base udev pata scsi sata encrypt filesystems"
edit: I should note that I did reinstall the kernel after making those edits to mkinitcpio.conf.
Any idea what I'm doing wrong? As always, I really do appreciate the help. Thanks in advance!
Last edited by jalu (2011-04-16 22:14:20)

So it looks like this major problem was caused by a minor mistake. The file /etc/rc.sysinit was not executable. This made it impossible for the kernel to run the script, which in turn made it impossible for the kernel to mount /dev/sda2 (the swap partition) at /dev/mapper/swap. For some unknown reason, this in turn caused /dev/sda2 to be mounted at /, messing everything up.
Anyway, a simple sudo chmod +x /etc/rc.sysinit fixed the problem. Thanks for the help, MadTux!

Kinit mounts root filesystem as read only [HELP][solved]

hello
I've being messing around with my mkinitcpio trying to optimize my boot speed, i removed some of the hooks at the beginning i couldn't boot, but then now i can boot but the root filesystem mounts as read only, i tried everything my fstab looks fine, / exists with defaults i tried to mount it referencing by it's uuid or by it's name and i get the same results, it mounts the filesystem as root only all the time no mather what i do.
There is not logs since i started playing with mkinitcpio, or anything i searched everywhere in this forum and around the internet, and i can't find any solution that would work, i restored all the hooks and modules on mkinitcpio and the result it's still the same. i also changed the menu.lst in grub to vga=773 but that's about it.
Can anyone help with this please i can't seem to boot properly.
Regards
Last edited by ricardoduarte (2008-09-14 16:16:25)

Hello
Basically what happens it's that it loads all the uDev events then the loopback, it mounts the root read only, then when it checks filesystems it says
/dev/sda4: clean, 205184/481440 files, 1139604/1920356 blocks [fail]
************FILESYSTEM CHECK FAILED****************
* Please repair manually and reboot. Note that the root *
* file system is currently mounted read-only. To remount *
* it read-write: mount -n -o remount,rw / *
* When you exit the maintenance shell the will *
* reboot automatically. *
Now what bugs me its that i can do that mount -n -o remount,rw / with no problems and when i do
e2fsck -f /dev/sda4
it doesn't return any errors just says that 0.9 non continuous.
none of this makes sense to me!! thats why i though that the problem could be coming from mkinitcpio or something
any ideas
Thanks for your help, btw thanks for the quick reply
Regards
Last edited by ricardoduarte (2008-09-14 15:48:49)

Auto-remount of root file system, like read only

Hello, I'm a newbie compiling kernels, but wanna learn. (I came here bacause i don't know how to solve this or where to find an answer). I compiled some few... but, in the last days i'm suffering an strange auto-remount of the root fs "/", (remounts like read only) it's temporally fixed using fsck and rebooting. But a time later of reboot, i'm working, and suddenly the same error comes again. it's really disturbing, because force to reboot often.
I think that is not a physical error. I did not have problems with badblocks. Something creates logical errors, either the auto-remount did
Surely I have something bad on the kernel, and probably have more things there than i must.
On the other hand my /var/log/lastlog is always full of an strange ASCII and i can't see the boot info.
this is my fstab:
/dev/sda6 / ext4 noatime 0 1
/dev/sda3 /home ext3 noatime 0 2
/dev/sda5 none swap sw 0 0
/dev/sr0 /media/cdrom auto noauto,ro,user 0 0
#/dev/fd0 /media/floppy auto noauto 0 0 No hay unidad de disco flsexible
proc /proc proc defaults 0 0
shm /dev/shm tmpfs nodev,nosuid,noexec 0 0
And a summary of my dmesg report
[ 55.917194] EXT4-fs (sda6): re-mounted. Opts: commit=0
[10195.993335] nf_conntrack: automatic helper assignment is deprecated and it will be removed soon. Use the iptables CT target
to attach helpers instead.
[10229.239298] ata1.00: exception Emask 0x0 SAct 0xf SErr 0x0 action 0x0
[10229.239305] ata1.00: irq_stat 0x40000001
[10229.239318] ata1.00: cmd 60/80:00:a8:4d:6e/00:00:2d:00:00/40 tag 0 ncq 65536 in
[10229.239318] res 41/40:80:1e:4e:6e/00:00:2d:00:00/00 Emask 0x409 (media error) <F>
[10229.239330] ata1.00: cmd 60/20:08:b0:98:bb/00:00:07:00:00/40 tag 1 ncq 16384 in
[10229.239330] res 41/04:00:1e:4e:6e/00:00:2d:00:00/00 Emask 0x1 (device error)
[10229.239342] ata1.00: cmd 61/08:10:47:98:c0/00:00:37:00:00/40 tag 2 ncq 4096 out
[10229.239342] res 41/04:00:1e:4e:6e/00:00:2d:00:00/00 Emask 0x1 (device error)
[10229.239354] ata1.00: cmd 61/28:18:17:96:21/00:00:38:00:00/40 tag 3 ncq 20480 out
[10229.239354] res 41/04:00:1e:4e:6e/00:00:2d:00:00/00 Emask 0x1 (device error)
[10229.243923] ata1.00: configured for UDMA/133
[10229.243944] sd 0:0:0:0: [sda] Unhandled sense code
[10229.243948] sd 0:0:0:0: [sda]
[10229.243951] Result: hostbyte=0x00 driverbyte=0x08
[10229.243955] sd 0:0:0:0: [sda]
[10229.243957] Sense Key : 0x3 [current] [descriptor]
[10229.243963] Descriptor sense data with sense descriptors (in hex):
[10229.243966] 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00
[10229.243980] 2d 6e 4e 1e
[10229.243988] sd 0:0:0:0: [sda]
[10229.243990] ASC=0x11 ASCQ=0x4
[10229.243995] sd 0:0:0:0: [sda] CDB:
[10229.243997] cdb[0]=0x28: 28 00 2d 6e 4d a8 00 00 80 00
[10229.244156] end_request: I/O error, dev sda, sector 935368775
[10229.244161] Buffer I/O error on device sda6, logical block 1336321
[10229.244164] lost page write due to I/O error on sda6
[10229.244177] sd 0:0:0:0: [sda]
[10229.244179] Result: hostbyte=0x00 driverbyte=0x08
[10229.244183] sd 0:0:0:0: [sda]
[10229.244185] Sense Key : 0xb [current] [descriptor]
[10229.244189] Descriptor sense data with sense descriptors (in hex):
[10229.244192] 72 0b 00 00 00 00 00 0c 00 0a 80 00 00 00 00 00
[10229.244206] 2d 6e 4e 1e
[10229.244213] sd 0:0:0:0: [sda]
[10229.244215] ASC=0x0 ASCQ=0x0
[10229.244219] sd 0:0:0:0: [sda] CDB:
[10229.244221] cdb[0]=0x2a: 2a 00 38 21 96 17 00 00 28 00
[10229.244233] end_request: I/O error, dev sda, sector 941725207
[10229.244251] ata1: EH complete
[10229.244268] JBD2: Detected IO errors while flushing file data on sda6-8
[10229.244281] Aborting journal on device sda6-8.
[10229.439264] EXT4-fs error (device sda6): ext4_journal_start_sb:348: Detected aborted journal
[10229.439272] EXT4-fs (sda6): Remounting filesystem read-only
[10232.111686] ata1.00: exception Emask 0x0 SAct 0x1 SErr 0x0 action 0x0
[10232.111692] ata1.00: irq_stat 0x40000008
[10232.111705] ata1.00: cmd 60/08:00:18:4e:6e/00:00:2d:00:00/40 tag 0 ncq 4096 in
[10232.111705] res 41/40:08:1e:4e:6e/00:00:2d:00:00/00 Emask 0x409 (media error) <F>
[10232.264635] ata1.00: configured for UDMA/133
[10232.264653] sd 0:0:0:0: [sda] Unhandled sense code
[10232.264657] sd 0:0:0:0: [sda]
[10232.264660] Result: hostbyte=0x00 driverbyte=0x08
[10232.264664] sd 0:0:0:0: [sda]
[10232.264666] Sense Key : 0x3 [current] [descriptor]
[10235.143085] Descriptor sense data with sense descriptors (in hex):
[10235.143088] 72 03 11 04 00 00 00 0c 00 0a 80 00 00 00 00 00
[10235.143103] 2d 6e 4e 1e
[10235.143110] sd 0:0:0:0: [sda]
[10235.143113] ASC=0x11 ASCQ=0x4
[10235.143117] sd 0:0:0:0: [sda] CDB:
[10235.143119] cdb[0]=0x28: 28 00 2d 6e 4e 18 00 00 08 00
[10235.143132] end_request: I/O error, dev sda, sector 762203678
[10235.143156] ata1: EH complete
Please, anybody could help me to undesrtand and solve this problem?
Is it a driver problem?
Regards

Your drive must be dying.
You can use SMART tools to check it.

Root is mounted as read-only

Hello,
I 've installed arch 2009.08 but when i am booting into my system a message appears that my / is mounted as ro (read-only)
I ve to run mount -n -o remount,rw / to make it writtable.
I ve used ext4 for / and /home partitions and ext3 for /boot
Is there any bug with the latest 2009.08 images ?
Thanks

x-tra wrote:
I amm gettin the folowing message during boot
#The superblock could not be read or does not describe a correct ext2 filesystem (FUNNY because i prepared ext4 partions for / and /home).
I f the device is valid and it really contains ext2/ext3 then the superblock is corrupt"
Please run efsck -b <block> /dev/sda3
Then my root partition has to be mounted using the command
mount -n -o remount,rw /
Any idea ?????
I ve done the installation using netisnstall cd because with the core one i had kernel panics
Here is my fstab
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
none /dev/pts devpts defaults 0 0
none /dev/shm tmpfs defaults 0 0
/dev/cdrom /media/cd auto ro,user,noauto,unhide 0 0
/dev/dvd /media/dvd auto ro,user,noauto,unhide 0 0
#/dev/fd0 /media/fl auto user,noauto 0 0
/dev/sda1 /boot ext3 defaults 0 1
/dev/sda2 swap swap defaults 0 0
/dev/sda3 / ext4 defaults 0 1
/dev/sda4 /home ext4 defaults 0 1
/dev/sdb1 /mnt/DATA ext4 defaults 0 1

[partially solved] Root mounted as read-only, lots of errors

I started my laptop without the power cord, and the boot stopped at several steps. I could continue the boot with pressing the power button for a second. XFCE booted fine, but some things were broken. Then I rebooted, and I cannot boot to xfce anymore at all (with or without power cord), since the root is mounted as read-only, and other partitions are not mounted at all. I didn't change my system at all so it is difficult to fix the problem. Now when I boot I just get lots of errors due to the read-only root partition. Fstab should be okay since it worked before, and has not been modified in months.
# /etc/fstab: static file system information
# <file system> <dir> <type> <options> <dump> <pass>
none /dev/pts devpts defaults 0 0
none /dev/shm tmpfs defaults 0 0
#/dev/cdrom /media/cd auto ro,user,noauto,unhide 0 0
#/dev/dvd /media/dvd auto ro,user,noauto,unhide 0 0
#/dev/fd0 /media/fl auto user,noauto 0 0
UUID=141f10a8-d0f2-43e0-b71e-5d01f1b3b126 /boot ext2 defaults 0 0
UUID=7f0ebf97-6e66-4e39-9db8-05fabd53180b swap swap defaults 0 0
UUID=859ac481-922b-4126-a575-462b145581fd / jfs defaults 0 0
UUID=3439fb11-ee6f-443a-9635-73ee7268e31c /media/disk ext3 defaults,data=writeback 0 0
UUID=82e37328-095e-4fd8-87ca-a74c6decc746 /media/oldroot ext3 defaults,data=writeback 0 0
I found related errors in daemon.log
Jun 23 13:15:26 nawi laptop-mode: Remounting filesystems.
Jun 23 13:15:26 nawi laptop-mode: /dev/sda6 not found in PARTITIONS.
Jun 23 13:15:26 nawi laptop-mode: / not found in PARTITIONS.
Jun 23 13:15:26 nawi laptop-mode: Checking /dev/sda6 against HD because PARTITIONS contains "auto".
Jun 23 13:15:26 nawi laptop-mode: Considering /dev/sda.
Jun 23 13:15:26 nawi laptop-mode: /dev/sda6 contains /dev/sda, which is in HD, so we will remount it.
Jun 23 13:15:26 nawi laptop-mode: Original options: rw
Jun 23 13:15:26 nawi laptop-mode: Reducing file system type.
Jun 23 13:15:26 nawi laptop-mode: Executing: mount /dev/sda6 / -t jfs -o remount,rw,atime,norelatime
Jun 23 13:15:26 nawi laptop-mode: Executing: /sbin/blockdev --setfra 256 /dev/sda6
Jun 23 13:15:26 nawi laptop-mode: none not found in PARTITIONS.
Jun 23 13:15:26 nawi laptop-mode: /dev not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: Checking none against HD because PARTITIONS contains "auto".
Jun 23 13:15:27 nawi laptop-mode: Considering /dev/sda.
Jun 23 13:15:27 nawi laptop-mode: none not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: /proc not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: Checking none against HD because PARTITIONS contains "auto".
Jun 23 13:15:27 nawi laptop-mode: Considering /dev/sda.
Jun 23 13:15:27 nawi laptop-mode: none not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: /sys not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: Checking none against HD because PARTITIONS contains "auto".
Jun 23 13:15:27 nawi laptop-mode: Considering /dev/sda.
Jun 23 13:15:27 nawi laptop-mode: none not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: /dev/pts not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: Checking none against HD because PARTITIONS contains "auto".
Jun 23 13:15:27 nawi laptop-mode: Considering /dev/sda.
Jun 23 13:15:27 nawi laptop-mode: none not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: /dev/shm not found in PARTITIONS.
Jun 23 13:15:27 nawi laptop-mode: Checking none against HD because PARTITIONS contains "auto".
Last edited by nawitus (2009-06-23 20:57:47)

It seems that laptop-mode remounted the partitions as read-only, because of bug in laptop-mode(?). I disabled that daemon, and now boot works. After that I can boot normally even with laptop-mode daemon, but now I'm afraid of booting without the power cord as that can break the system..

Reset lost root password and now have read only filesystem

Hello,
I have recently had to reset a locked root password by booting from cdrom, mounting the first boot disk, editing the shadow file to remove root's password and rebooting the system.
The system has booted OK but, I now have a read only filesystem - everything in / cannot be edited, passwd doesnt work etc.
df -k shows the root (/) filesystem has been mounted on the physical disk I edited:
Filesystem kbytes used avail capacity Mounted on
/pci@83,4000/FJSV,ulsa@2,1/disk@0,0:a 10085836 185862 9799116 2% /
but in the vfstab it still references the disksuite metadevice:
#device device mount FS fsck mount mount
#to mount to fsck point type pass at boot options
/dev/md/dsk/d30 /dev/md/rdsk/d30 / ufs 1 no -
So, can I simply boot from CDROM again, amend the vfstab to be /dev/dsk/c0t0d0s0 (instead of /dev/md/dsk/d03) and reboot?
Any help with this is appreciated!
Thanks,
Emma

df -k should have shown root mounted on md0
e.g. on my machine
# df -k
Filesystem kbytes used avail capacity Mounted on
/dev/md/dsk/d0 8260691 4366317 3811768 54% /
what does /etc/system show for rootdev?
# grep rootdev /etc/system
* rootdev: Set the root device. This should be a fully
* rootdev:/sbus@1,f8000000/esp@0,800000/sd@3,0:a
rootdev:/pseudo/md@0:0,0,blk
Remember if this is a mirrored drive, when you boot from CD you may need to mount both sides of the mirror and make changes on both sides- otherwise the replication may not goes as expected.
Actually, I have run into problems with the modifying one side of a mirror this way. In the past Sun tech support would recommend that I break the mirror and then rebuild it once the system is up and running. So in your case you may want to boot from CD, mount the 1st disk slice, edit /etc/vfstab AND /etc/system, boot into the OS and use the various meta commands to delete and rebuild the mirror- or at least maybe to drop and reattach the 2nd 1/2 of the mirror.

FStab messed up, root is read only

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