CentOS 5 :: Properly Unmounting RAID Drive In Recovery Mode?
Mar 9, 2010
I had a corrupted superblock in my RAID boot drive (/dev/md0), which I fixed with fsck in Recovery Mode.
However, after rebooting, the same boot-up problem (hanging for hours) persists. When I re-enter Recovery Mode to examine the boot drive, I found its superblock was corrupted again (which I fixed again using fsck).
Is there a proper reboot procedure which is gentle on the boot drive, such that it doesn't corrupt it? Or, is something else amiss?
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Mar 9, 2010
I had a corrupted superblock in my RAID boot drive (/dev/md0), which I fixed with fsck in Recovery Mode.However, after rebooting, the same boot-up problem (hanging for hours) persists.When I re-enter Recovery Mode to examine the boot drive, I found its superblock was corrupted again (which I fixed again using fsck).Is there a proper reboot procedure which is gentle on the boot drive, such that it doesn't corrupt it? Or, is something else amiss
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Oct 25, 2010
I have an external DVD burner hooked up to an EEE PC 701SD. The disk has worked on a dell desktop computer, and a 701 (the first eee pc which I built the install on) without a problem, however when I boot up the install disk on the 701SD, I get a message telling me it's unable to download the kickstart file. It's being set to cdrom:/ks.cfg, which should work, but it isn't.... This exact same disk just did a full install on the 701 15 minutes before I ran it on this computer.
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Mar 23, 2010
I had a sata drive go down on my software raid array a couple days ago..After replacing the defective drive, I rebuilt it using fdisk to set partitions and mdadm to add the drive back into the raid array.After getting md2 to mount to /mnt I copied the /mnt/etc/fstab and /mnt/etc/mdadm.conf to the /etc directory and rebooted..When I boot, my /dev/md2 partition is not mounting to / It is not loading all of the services at boot time it should.. the size of /dev/md2 on / is even wrong.. it should be about 1.3TBwhen I manually mount /dev/md2 to /mnt I can access all of my data, through /mnt/var/www/vhosts and so on.. I am at a loss, why is the machine booting to this craziness?All of my data, that I know of can be accessed when md2 is mounted to /mnt[root@ESS000272 etc]# cat mdadm.conf
# mdadm.conf written out by anaconda
DEVICE partitions
MAILADDR root
[code]....
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May 10, 2010
A few days ago I began to get messages about my hard drive running out of space, and while I tried to clear out some files to make room I somehow managed to mess something up such that my main login screen appeared with hugely distorted letters and dialog boxes, and it wouldn't let me log in. While this is still the case, I can now log in by booting to recovery mode, selecting the netroot option, doing an "su myusername", and then executing "startx".
While this is a little inconvenient, it does bring up my standard Ubuntu operating environment and I now have access to all my files, email, internet, etc. There are still a few miscellaneous things that are messed up, however, and I don't yet know how to fix themIn particular:a) I can't print. I tried running the printer configuration tool from the System->Administration menu, but there's no "New Printer" icon. Alsowhile trying to get it working, I managed to generate a "The cups scheduler is not running" error message.b) I can't mount a USB drive. Every time I plug one in, I get an error message that says "Unable to mount drive, not authorized."c) Finally, there's the basic problem of still not being able to login without going thru my recovery mode workaround.I suspect all these problems are related, though I'd be happy to fix them one at a time if that's what it takes.
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Feb 1, 2011
Could any RAID gurus kindly assist me on the following RAID-5 issue?I have an mdadm-created RAID5 array consisting of 4 discs. One of the discs was dropping out, so I decided to replace it. Somehow, this went terribly wrong and I succeeded in marking two of the drives as faulty, and the re-adding them as spare.
Now the array is (logically) no longer able to start:
mdadm: Not enough devices to start the array.Degraded and can't create RAID ,auto stop RAID [md1]
I was able to examine the disks though:
Code:
root@127.0.0.1:/etc# mdadm --examine /dev/sdb2
/dev/sdb2:
Magic : a92b4efc
Version : 00.90.00
code....
Code:
mdadm --create --assume-clean --level=5 --raid-devices=4 /dev/sda2 /dev/sdb2 /dev/sdc2 /dev/sdd2
As I don't want to ruin the maybe small chance I have left to rescue my data, I would like to hear the input of this wise community.
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Dec 17, 2010
I have just configure RAID 1 on my IBM X3400 Server in CENTOS 5 ..Partition information is md0 boot , md1 swap and md2 is root ....but after resyn when i run cat /proc/mdstat I realize that md0 and md1 is ok and present with [UU] status. BUT the md2 is showing on one [U_].. that means my root partition is not properly in RAID 1.. how can i make it active in both drive. Or i need to reinstall complete system again. Screen shot attached [URL]
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Aug 18, 2010
I've got a, as it seems to me, strange problem.I've inadvertently deleted my user from the group admin so I'm in the same situation of a lot of other users (read a lot of messages about it).My problem is that when restarted in recovery mode there is no way I can choose the 'drop to the root shell' or similar in the menu.The menu appears for a second and then I've got an empty screen. If I press a key I've been requested for a username and password that of course is not what I need.
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Dec 10, 2010
We have a Blade server connected to a two internal ESM Cisco switch. We want to have a active-backup configuration with bonding. We follow the documentation and we hace configured the next:
Centos 5.5
ETH0:
[root etc]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Broadcom Corporation NetXtreme II BCM5709S Gigabit Ethernet
DEVICE=eth0
[Code].....
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Jul 29, 2010
I burned the live version of OpenSUSE 11.3 (Gnome, 32bit) to a CD to test the compatibility of an HP Pavilion p6510f. Although Xubuntu 10.4 booted up fine, OpenSUSE did not. A message about RAID would appear (too briefly to read) and then the computer would reboot.I checked in the BIOS and found that the SATA drive has 3 modes: IDE, RAID and AHCI. The hard drive was set to RAID.
When I changed the hard drive mode to IDE, I was able to run the OpenSUSE live CD; but the change ruined my Windows installation. Windows doesn't boot under IDE or RAID mode. (I have reset the mode to RAID and am restoring the Windows installation.) Is there an option/argument that I can pass to the kernel so that OpenSUSE will work under RAID mode? (Since Xubuntu 10.4 was able to do it, I'm assuming OpenSUSE should be able to.)
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Aug 4, 2010
Recently I built a web server for my clients to host in house. After talking with the web developer they informed me that i needed a CentOS computer with Drupal for them to design the website. This is my first Linux install and after spending hours upon hours configuring the server with FTP, SSH, and configuring our DD-WRT router with proper port forwarding we turned it over to the web designers to start work on the website.
A month goes by and the website is almost done, at this point we go to make a full backup of the hard drive. Due to a hardware problem it fried the circuit board of the hard drive. After attempting to recover the files myself we opted to send it to a HD data recovery facility to recover the information. We have received back a DVD containing the 2GB's worth of data from the CentOS hard drive. It contained 2 folders one for each of the partitions. I can view and see all the files on my windows machine and it appears that all of the data was recovered successfully. I harbored some hope that i could simply reinstall CentOS with the same account information and then just drop the recovered files on top of the new installation and have it start working.
I then reinstalled CentOS on another hard drive in the same computer and used the same credentials for installation. After i successfully booting into CentOS i turned off the machine and connected the hard drive it to my Windows bench machine. After booting into Windows i was unable to browse the hard drive. After doing more research and installing Ext2fsd i was able to see the 2 partitions CentOS had just created, but only able to access the Boot partition. After more research i discovered the default installation of CentOS creates a Raw file type for the 2nd partition and that is why i am having issues reading it inside of Windows.
I then downloaded a copy of Knoppix to see if this would allow me to write the old files over the new ones. After booting up the CD i could only browse to the /boot drive(and im not even sure if this is Knoppix's Virtual /boot or my CentOS /boot).
My question is what would be the best steps to recovery for my scenario? Can the files be placed to the drive and have everything restored? Is the only way to recovery thru reinstalling all applications and reconfiguring from scratch? How difficult is Drupal DB to recover in this type of scenario?
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Nov 18, 2010
I attempted to install Catalyst 10.11 for my ATI HD 2600XT and the system now only displays lines and a large block of pixels where the mouse would go. CTRL-ALT-F1 kills the system and does not provide a command prompt. This is a single installation, not dual-boot, but there is no Press Esc to access the Grub menu during startup so I cannot choose safe mode. I attempted to get into Recovery mode using the flash drive that I used to install the system and it tells me there is no Recovery kernel (I used the 64-bit Desktop installer, not alternative). Does anyone know an alternative to get into the Grub menu other than ESC during bootup? Alternatively, do I need to download the 64-bit Alternative ISO and create a new boot disk with it so I can access Recovery mode? Is there something else I'm not thinking of?
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Dec 7, 2010
I accidentally chose the "recovery mode" and now i dont know what to do. What commands i have to enter to go back to normal ubuntu mode with graphic etc?
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Jul 28, 2010
I bought an external hard drive a couple of months ago and in the last few days it is having some problems.
Step 1, I turn it on and plug in the USB
/var/log/syslog:
Jul 28 13:52:39 bc1982 kernel: [61683.130027] usb 1-5: new high speed USB device using ehci_hcd and address 22
[Code].....
I turn off the drive, wait a while, then turn it on again in which sometimes it works fine, sometimes it doesn't. These errors have occured frequently in the past two days, but never before that
I don't know what these system logs mean, does anyone else?
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Feb 28, 2009
I am attempting to set up an IBM Intellistation Z Pro to optionally boot from many OS versions. One of these is Windows XP. Windows XP is currently installed on a RAID 1 device consisting of a pair of 1 GB WD drives. These are SATA drives. The HBA I'm using is a SYBA SATA II card that uses Silicon Image's SIL3124-2 chip. The card has a BIOS and I've set up two 60 GB mirrors for Windows. I boot XP fine from this setup and things run good.
I've downloaded the CentOS 5.2 images and am able to start the installation process. I'm baffled on where to install the OS software on the RAID device. The installation process shows the two 1GB drives as separate drives and there is no acknowledgment of the 60 GB partition I've already created on them for Windows XP. I expected to see only the one logical RAID device and 60 GB of it in use for a NTFS partition. Reluctant to proceed further, I bailed on the install and am asking for advice on how to proceed.
The big question is
1) How can I install CentOS 5.2 on the RAID drive to coexist with a Windows XP installation? My desire is to boot either from this drive.
other questions related to this are:
2) Why does the CentOS partitioning software used for the install not display the logical RAID drive set up through BIOS (I'm assuming that this means it was set up apart from any Windows drivers etc.)? Only the two physical drives are displayed and there is no mention of any partitions in use.
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Mar 12, 2010
I would like to setup a CentOS file server with LVM and Raid1. Having 6 x 500GB drives, 4 x 1GB Ram and a Quad Core Cpu, I am considering to configure 3 hdd as LVM then raid 1 to the remaining 3 hdd's.
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Jan 6, 2010
I stupidly unplugget my USB-cable, which was connected to my Nokia music phone, just as if I were in Windows. What do I do? I've lost my music on the phone, or, it seems it may be there (the correct mass of data), but my phone now tells me there is no music... Can I recover this? And - what is the correct way to unplug a USB unit in Ubuntu? To make it work, and find the phone/drive - I just typed "sudo lsusb" in the terminal, and it found and opened the memory automatically... How should you unmount the USB, and maybe even how do I get my data back?
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Mar 30, 2010
i want to remove the raid 1 arrays on our server centos and use standalone drive
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Jan 8, 2011
I have a pre-existing setup with Windows XP Professional and CentOS5.5 on a dual boot setup with the Linux drive setup as the primary drive hosting the grub menu.
I am replacing these machines with new updated ones and they have windows setup on a RAID0. I think it would be easiest to follow my previous setup and move the RAID to secondary SATA ports and put the linux drive on the primary SATA port, or should I just change the boot order in the BIOS to have the secondary linux drive boot first?
can I move a RAID setup to secondary controller ports without breaking the RAID?
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Jun 22, 2010
A client is having a problem with a recently installed CentOS 5.5 x86_64 Virtual Machine (under VMware ESX 3.5). The problem is reported by the user as "Nautilus windows closing after a time when looking at data from the NFS server".
The folders the user is using are in a file system that is NFS mounted from a Solaris 10 file server cluster (VCS). These are mounted using autofs. These are direct mounts as in:
$ grep ^/- /etc/auto.master
/- /etc/auto.direct
$ cat /etc/auto.direct
/opt/user-data fileserver:/export/org/data/something/something
I have reproduced the problem by logging in and opening a number of folders using Nautilus under /opt/user-data. After a while, all Nautilus folder windows that are under /opt/user-data will close and when this occurs you can see from the command line that autofs has unmounted the area from the file server.
This should not occur because Nautilus having a window open should count as the folder being in use and should stop autofs from unmounting it. I don't know if this is an autofs or Nautilus bug but I suspect it's a Nautilus bug in it not keeping some kind of access open on the folder. System information:
The system was updated at install time. /boot/grub/grub.conf has "divider=10" appended to the kernel line.VMware Tools are installed. NTP is also configured and steps the time to UTC at boot if required (maybe this is overkill). autofs and Nautilus versions are:
$ rpm -qa | egrep autofs|kernel|nautilus | sort
autofs-5.0.1-0.rc2.143.el5.x86_64
kernel-2.6.18-194.3.1.el5.x86_64
kernel-2.6.18-194.el5.x86_64
nautilus-2.16.2-7.el5.x86_64
[Code]...
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Feb 22, 2010
This is my first post on LinuxQuestions.org, so I hope I am posting this this in the right forum, and English is not my mother language, so I hope I made myself understandable. I have this small Poweredge 350 server with two 80GB IDE hard drives running Red Hat Fedora 5, with software Raid 1. Some months ago hda started to have unrecoverable I/O read errors for some blocks. I leaved it that way for some time then hdb also started having same kind of issues. I got new hard drives and replaced hdb first, but the problem is mdadm hasn't been able to recover the raid. I have three LINUX RAID partitions conforming the raid 1 between hda and hdb
/dev/md0
/dev/md1
/dev/md2
[code]....
So how can I force the raid to be recovered ignoring the hda errors, is there a way to recover this?
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May 1, 2010
How do I get int recovery mode in Ubuntu 10.04?
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Jun 17, 2010
ok so i have been haviung the same problem for a while now and it is starting to **** me off, with every distribution of ubuntu i am getting thuis stupid message when i log in it is ionoly every once i a while that i get it but saince i have upgraded to 220.04 cannot fix it. i could fix it befor pretty easily, the probklem is when i get t o the login screen i get this generic login menu whne i attept to login i get this message somethiung like power management is not installed correctly. like i said b4 it was easy to fix, all i would do is to go to the ubuntu recovery thing, which is apparently not available ion 10.04 it does not evn give me a choice which to boot how do i get to recover mode in ubuntu 10.04?
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Jan 1, 2011
I have a pretty huge (16x1TB disks) RAID6 LVM array on a Red Hat box which has really thrown a spanner in its works and I'm in a right fix: I was part-way through rebuilding the array with one replacement disk when a second died and a third seemed to have fallen from the array. I was replacing a disk which had been showing signs through SMART of probable failure (uncorrectable errors) and I noticed the second disk was just starting to give similar but slightly less numerous errors.
Now my logic based on a gradually growing understanding of the workings of the LVM is that I stand a chance of resurrecting things as the data held on the machine has been static for a while (a few days) before my attempted drive replacement and none of the disks have actually FAILED.
I have replaced the unit I removed so the physical devices are as they were before the exercise. I clearly need to carefully convince the configuration that it's "how it was" and there are a few meta-data files in the /etc/lvm/archive I believe I can use to re-"set the scene". Presently the machine fails to boot completely and it's patiently waiting in single-user mode for my next visit.
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May 4, 2010
recovering a partial upgrade to Lucid.
4 core Xeon , was running 64 bit 9.10.
Upgrading over the weekend, but it failed, and suggested running dpkg-reconfigure -a
I couldn't launch any terminal/xterm windows, and couldn't login via ssh (kicked me out with xmalloc failure) or through a virtual console (showed garbled characters)
So I had to reboot.
Now the boot process -- I've tried recovery mode for all othe kernels I've got installed, but all fail in the same way:
Code:
Begin: Starting AppArmor profiles...
bash: xmalloc: ../bash/locale.c:73: cannot allotate 225469542417 bytes (0 bytes allocated)
Failure: AppArmor profiles failed to load.
[Code]....
It looks like it might be a libc problem. At any rate, I'd like to get into a recovery console to restart the update.
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May 22, 2010
I run 9.10 from a live usb with persistece, and got /etc/sudoers awfully messed up. now i'm told to fix in through 'recovery mode', but i don't think live usb has one. is that true? what about my sudoers? is there another way to fix it?
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Jul 19, 2010
Afraid I'm an utter newbie. I'm using 10.04 64 bit. I only noticed this after I tried to install the NVIDIA driver and all my ubuntu os'es blackscreened after restart. Because I couldn't even access recovery mode, I ended up reinstalling ubuntu, overwriting the old root.I thought the problem was due to the driver, but it's even now persisting. I can run the terminal (within X?) but if I try ctl alt <F1-6>, the screen just freezes until I do ctl alt F7. Furthermore, recovery mode still leaves a black screen after the initial loading text. I need it to work before I attempt reinstalling the NVIDIA drivers again, as I don't want to reinstall the OS and all the programs.
Sometimes it feels like I can do stuff in recovery mode, like Ctl Alt Delete or sudo shutdown, but sometimes not. Not sure if this is related, but grub also lists windows vista and windows recovery as the opposite they should be (I thought my windows was completely screwed until I tried windows recovery).
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Nov 21, 2010
I have a HP mini 2133 with Ubuntu 10.04 NBR installed, but because the CMOS battery went flat and the date on the BIOS got reset to 1980, I now get a failure starting the machine (Superblock failure: Last mount time is in the future). I've already googled on this error, and the general advise seems to be "run fschk and let it complete", but my question is...I don't get a grub screen come up when Ubuntu boots, and Contrl/Alt/F* doesn't bring me to any login windows. So how do I interrupt the startup, and get to a login window before I get the mount error.
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Mar 31, 2011
I messed up my video drivers and now can't get into recovery mode. Pressing the shift key isn't working. All that happens is the splash screen appears in faded looking colors and then fades to white.
I've got an ASUS N61 laptop with an ATI Radeon 5730 graphics card. I just upgraded to 10.10 from 10.4 and was trying to install the open source video drivers. I must have messed something up and can't get to the terminal now.
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Apr 6, 2011
I'm having a huge problem right now and I could use some help deciphering what's wrong.I can't get my system to boot (see signature) and even the recovery mode is buggered. henever I try to boot, all I get is a flashing underscore. This is the same for both the normal and recovery modes Kernels. I've run the boot info script from a live cd and I've attached it to this post.
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