Ubuntu Servers :: Raid5 Repair Partition Table - Recognized Too Late
Feb 27, 2011
I opened GParted to create a new partition on a new drive. He wanted me to create a partition table first which I did, and it was created directly without any prompt like im used to see when creating partition. So I recognized too late, that i actually created a MBR on one of my 6 1TB raid5 drives. Not beeing sure if the ne MBR was really written, I have opened ubuntu disk utility and clicked on the check raid button. It directly made a resync. After the resync, mdadm --detail /dev/md0 told me everything is ok and synced. Then I wanted to mount it with:
mount /dev/md0 /mnt Then I get the following error: "mount: wrong fs type, bad option, bad superblock on /dev/md0, missing codepage or helper program, or other error In some cases useful info is found in syslog - try dmesg | tail or so" I think I just killed my raid5 ;(
I shouldnt work on my server when im tired and when I actually have no time ;( My last hope is the fact, that "Disk Utility" shows that there is a .0 TB ext4 volume on my raid (see screen below) [URL]
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May 21, 2011
A few months ago I tried to shrink an NTFS partition using gparted and use the free space to install Haiku. However, gparted crashed in the middle of the resize, leading to a corrupt partition table. I tried to solve the problem myself, using testdisk to detect the partitions. However, the fix is not perfect, and it left me with a partition table that goes "outside" of the disk (i.e. the partition table has allocated more sectors than there actually are on the disk to the last partition).
Recently I need to reinstall Ubuntu Natty, but because the partition table is corrupt, the installer on the Ubuntu Natty Live CD (as well as gparted) see the disk as entirely unpartitioned. What is weird is that the Disk Utility (aka palimpsest), fdisk on my current Natty distro (upgraded from Maverick, which I want to replace with a fresh install), and GRUB 2 see the partitions fine (with some errors, such as listing a few trillion TBs of available space, a result of the corrupt partition table).
I am using an Asus U30Jc laptop with a single 500GB HDD. My current setup is supposed to be like this:
/dev/sda1: A hidden FAT32 recovery partition generated by Windows 7, listed as containing Windows Vista by GRUB 2
/dev/sda2: NTFS partition containing Windows 7 (labeled "OS")
/dev/sda3: Extended partition containing "DATA", Ubuntu, swap, and the erroneous trillions of TBs of space
/dev/sda5: NTFS partition containing user data (labeled "DATA")
/dev/sda6: Ext4 partition containing Ubuntu
/dev/sda7: swap partition
(*Though I'm not supposed to have it, and it isn't listed in /dev while running the Live CD, /dev/sda4 exists as a zero-length partition in the output from sfdisk; not sure why)
Currently I've tried the following:
- testdisk, using "deeper search" and writing the partition table back to disk; produced a (usable) partition table that was bad.
- [URL], fsck didn't do much at all, except raise various errors on all partitions except the one containing Natty.
- [URL], tried to substitute the numbers caljohnsmith gave to thegreat with the corresponding values from my run of fdisk -lu, but because caljohnsmith didn't explain where the values came from and what they meant (no offense to him), I was lost; after the last step (setting the end sector on the extended partition to the last cylinder boundary (which I didn't really understand; tell me if you need details on what I did)), gparted went from showing the trillions of TBs of free space as outside all partitions to showing them as inside the extended partition; this also somehow caused the partitions to overlap.(The error parted raises changed from "Error: Can't have a partition outside the disk!" to "Error: Can't have overlapping partitions.
Running fdisk from the Natty Live CD gives
Code:
ubuntu@ubuntu:~$ sudo fdisk -lu
Disk /dev/sda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x74ef0aca
Device Boot Start End Blocks Id System
/dev/sda1 2048 34812854 17405403+ 1c Hidden W95 FAT32 (LBA)
/dev/sda2 * 34812855 279000854 122094000 7 HPFS/NTFS
/dev/sda3 279000855 976768064 348883605 f W95 Ext'd (LBA)
/dev/sda5 279000918 875204030 298101556+ 7 HPFS/NTFS
/dev/sda6 875204608 972859391 48827392 83 Linux
/dev/sda7 972861440 976771055 1954808 82 Linux swap / Solaris
Running sfdisk -l from the Natty Live CD gives
Code:
ubuntu@ubuntu:~$ sudo sfdisk -l /dev/sda
Disk /dev/sda: 60801 cylinders, 255 heads, 63 sectors/track
Units = cylinders of 8225280 bytes, blocks of 1024 bytes, counting from 0
Device Boot Start End #cyls #blocks Id System
/dev/sda1 0+ 2166 2167- 17405403+ 1c Hidden W95 FAT32 (LBA)
/dev/sda2 * 2167 17366 15200 122094000 7 HPFS/NTFS
/dev/sda3 17367 60800 43434 348883605 f W95 Ext'd (LBA)
/dev/sda4 0 - 0 0 0 Empty
/dev/sda5 17367+ 54478- 37112- 298101556+ 7 HPFS/NTFS
/dev/sda6 54478+ 60557- 6079- 48827392 83 Linux
/dev/sda7 60557+ 60801- 244- 1954808 82 Linux swap / Solaris
Running parted from the Natty Live CD gives
Code:
ubuntu@ubuntu:~$ sudo parted /dev/sda print
Error: Can't have overlapping partitions.
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Aug 6, 2010
I ve got a dual boot, XP and FC 12 on a single harddrive. After defragmentation of NTFS partition (With XP installation) cant'boot linux So, rub statrts with boot menu after selecting linux it tries to load linux but prints out some messages again and again (I do not remember contetn of messages) And these messages are circulating
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Jun 15, 2009
I used to have a 1TB external drive with lots of stuff on it. But after a reported drive failure during a F11 install the partition table seems to have been lost. (I think F11 toasted it)
Disk /dev/sdc: 1000.2 GB, 1000215724032 bytes
255 heads, 63 sectors/track, 121602 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
[code]....
The drive used to have xfs and a partition. Is there any way to rebuild the partition? Or is my 1TB of data gone forever? The drives seem to be fine now... I just want to get it up enough to either pull any data or just to get a file list. Most of the stuff on the drive was from somewhere else.(ie 300GB of NRN data for all of North America.
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Aug 1, 2010
I upgraded Windows to 7 from Vista. My Acer laptop had a recovery partition with Vista on it. I don't know, what I was thinking, after the update I deleted the recovery partition. Then got in to problem that Partition Table is deleted. Recovered the partition and partition table with LiveUSB and gpart.
So laptop was working again in about 30mins. Now I see the following issue. Laptop boots and works fine both in Ubuntu (default OS) and Win7. In Disk Utility the partitions are shown as in attachment. In Gparted the disk is not recognized as partition table is not recognized (so I guess) Output of fdisk is here for ref;
Code:
home@home-laptop:~$ sudo fdisk -l
[sudo] password for home:
Warning: ignoring extra data in partition table 7
Warning: ignoring extra data in partition table 7
Warning: ignoring extra data in partition table 7
[Code]...
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Aug 6, 2010
Is there a difference between using GPT partition table when formating hard drives and MS-DOS partition table? What are the advantages/disadvantages of using either?
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Jun 30, 2011
I know you can fail and then remove a drive from a RAID5 array. This leaves the array in a degraded state.
How can you remove a drive and convert the array to just a regular, clean array?
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Apr 12, 2011
I recently followed a tutorial on how to get OpenLDAP running with Samba on Lucid. It worked pretty well.Here's my very frustrating problem with it. For the first 5 - 10 minutes after rebooting, password handling (possibly PAM?) is hosed, including for users in LDAP authenticating via Samba.In fact, I think the only reason I can SSH into the machine during that window is because I happen to have certificate authentication enabled and my client uses that.When I try to do a sudo command after logging in, though, and have to enter the password, it hangs. I've searched logs and haven't come up with much.I *think* it's related to this bug, but I'm not sure.And here's what's killing me ... it's not easy for me to figure out how to ensure that slapd starts before smbd and rsyslog (I read somewhere else that it needs to start before that for some reason) b/c most of the jobs are upstart jobs, but slapd is not.By default it runs at S19 in rc2.d, and I've tried manually lowering that as far as S05 or S07, but I'm still having trouble.
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Mar 27, 2010
I want to change my sda2 partition to ntfs type. i have installed GParted but it is returning a strange type of error. Here is the error dump file...
[Code]...
WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot. WARNING: the kernel failed to re-read the partition table on /dev/sda (Device or resource busy). As a result, it may not reflect all of your changes until after reboot.
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Feb 5, 2010
Is there a program that will reread the partition table and update the kernel even if one of the unmodified partitions is mounted? I installed my system on one partition, then I added another with free space. Now I want to format the second partition, but the kernel doesn't know about it yet. I tried sfdisk -R /dev/sda, but it refuses while the root partition is mounted. Is there anyway I can avoid rebooting?
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Oct 5, 2010
What I believe has happened is that I've corrupted the partition table. Essentially one of my partitions' ending point exceeds the maximum number of cylinders/sectors on my drive.
Essentially I have the same problem as on the thread @ [url] but do not know how to fix this and am afraid to reformat/partition based on sectors without really knowing what I'm doing here.
[code]...
When I try to look at SDA in GParted everything shows up as unallocated (though it's obviously not) and it says
[code]...
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Jul 29, 2011
In my efforts to resize my BTRFS Partition, I accidentally unmarked my BTRFS partition as being BTRFS, and can't mark it back as I can't find the numeric ID for BTRFS and how to apply.
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May 20, 2010
I was installing opensuse 11.2 in parallel with windows xp.but during installation suddenly power has gone and after that opensuse is giving me the error message corrupt partition.i am also not able to login in xp. so I decide to reinstall windows, I got the error saying "invalid partition table" after the first restart of windows xp installation.
I tried to use windows system recovery console and committing fixmbr and fixboot commands, but didn't work.
i have 2 window partition(1 for windows and 1 for data).i do,nt want to format 2,nd partition.
How can I installed windows?My plan was first to install windows xp, then opensuse again.
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Jan 26, 2011
I have tried to automate the configuration of a usb drive with not much success.
The problem that I have is that I have a large amount of usb drives that have a partition table of type "loop" and I need to change them to "msdos". The size of the drives vary and I need to use FAT32 or FAT16 file system.
I've tried various partitioning commands and gui applications but cant find one that I can give a one line command to to set the partition table, maximum partition size and file system.
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Feb 8, 2010
I was reading another thread about someone with a bad partition table and I decided to join this forum. I'm not going to take any drastic actions with the partition (/dev/sda3) in question. I am going to wait for instructions on what to do first. I am not very good with Linux and need some hand holding. System: DELL 4550 Dual-Booted with XP and Ubuntu. Works OK, just no swap. Well, here's what I did: I deleted a partition for Windows XP Pro because it was a trial, and it ran out. I then decided to slide the swap partition for the Ubuntu Linux that I dual-boot into over. (If this was successful, I was going to try expanding the root partition to take up the unused space.) I used Gparted on a CD to do this, as I figured it was safe to do.
I now cannot mount the swap space at bootup (and have to go into a backup version of the OS), although I can use Gparted in Linux to execute the "swapon" command, and it appears that it worked because I now see "swapoff" as an option on the context menu. (I actually don't even need a swap partition, except to hibernate.) If I highlight the swap partition and click on "Drive" on Gparted's menu bar and select "Create Partition Table", it will erase all data on /dev/sda, so how do I fix the bad partition table non-destructively?
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Apr 24, 2010
Everything is installed and setup on my system, but when I setup my partitions I chose my Windows partition to be bootable. Can I just use cfdisk to toggle the bootable flag so my linux partition is bootable and rewrite the partition table?
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Feb 17, 2011
USB flash disk partition disappeared as well as partition table I'm not sure about the cause
Code:
root@u# less /var/log/syslog
usb 5-1: New USB device found, idVendor=058f, idProduct=1234
usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[code]....
Where did the partition table go? The device had one ext3 partition something around 4GB(size of USB storage device). I need to restore few files from this device.
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Nov 19, 2009
I'm trying to clone a Linux install to a different laptop. It's made a little complicated by two facts:
1) The 'new' laptop I'm trying to copy my Linux installation to is actually older and has a smaller hard drive then the computer I'm copying from
2) The computer I'm copying from has both a windows and Linux installation; I only care about the Linux partition.
I figured I would copy only the Linux partition from my primary computer to the laptop, sense the laptop doesn't have a large enough hard drive to copy everything. So I used the DD commands to copy SDA3 (main Linux partition) from my main computer to SDA2 of my laptop. When I came back a few hours later I was surprise to find my laptop trying to reboot itself (I never turned it off). It would keep starting to reboot, failing, and restarting itself. Not too surprising sense its boot partition wasn't changed so it's trying to boot into centos when I copied a redhat partition to it.
The problem is that when I used a redhat boot disk the rescue mode was unable to find a Linux partition to mount. /dev/sda2 exists, but trying to mount it gets the complaint "No such file or directory". "fdisk -l" lists sda1 (the boot sector) and sda2. Sda2 is the correct size and reports Linux LVM for its system. But "fdisk -l /dev/sda2" gives the error message "Disk /dev/sda2 doesn't contain a valid partition table" Did I not clone the drive correctly, or was an error caused due to the boot sector not being copied yet (the laptops boot sector is smaller then my old computers, so I can't copy from old computer to laptop)? Can I salvage the laptops partition table somehow, or do I have to repeat the cloning process? And if I do have to re-clone my computer can anyone tell me what I did wrong the first time so it works this time? I don't care if I copy just the Linux partition or both windows and Linux. Even though my main computer has a larger hard drive I'm only using about half of its available space so it should be possible to copy both partitions if I could ignore the unused sections of the harddrive.
Edit: I used DD to copy a tiny part of the Linux partition from my laptop so I could look at it. Most of it is illegible binary of course, but I scrolled through till I found some text right near the beginning:
Code:
VolGroup00 {
id="F2MWxh-....-BidcLe"
seqno = 1
[code]....
So it seems that the DD command did copy everything over to the laptop, which is good to know. I noticed that it says device="/dev/sda3" right in the middle of the code I just posted. The Linux section of my original computer was SDA3 but I copied it to partition SDA2 of my laptop. So is the problem because the boot partition is for the wrong device? I don't suppose if I modified that one line to say SDA2 it would be able to load correctly? (Not that I know how I would modify the line, short of using the DD command again).
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Jul 18, 2011
I just installed ubuntu via the windows executable and I couldn't mount my NTFS partition. I found this a little odd and I checked fdisk and it seems to think I don't have an ext4 partition as my entire internal HD is displayed as NTFS.
Here's the fdisk output:
When i try to mount the NTFS partition /dev/sda2 i get the following output:
I can't make heads or tails out of this. Anyone know what's going on here?
Windows recognizes that 30GB were taken from the NTFS partition for my linux install. It reads the max partition size as 465GB. fstab reports the NTFS partition size as 488GB.
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Jan 4, 2011
After reboot I saw this communication:Quote:Target filesystem doesn't have requested /sbin/init.No init found. Try passing init= bootarg.and I can't shutdown the system normally because it stops (live cd too).Then I can't repair this partition because it is always busy.
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Jun 18, 2010
I have just bought 4 1TB drives and set up a Software Raid level 5. Using Disk Utility tool I have created a GPT partition table and now when I want to create a partition, I get:
Error creating partition: helper exited with exit code 1: In part_add_partition: device_file=/dev/md0, start=0, size=3000610848768, type=
Entering MS-DOS parser (offset=0, size=3000610848768)
MSDOS_MAGIC found
found partition type 0xee => protective MBR for GPT
[Code].....
it does say nothing about creating an partition on the /dev/md0, although Gnome Disk Utility allows to do that - if I just run mkfs.xsf /dev/md0 - it works fine, yet Disk Utility tells me that disk has not been partitioned, see image:
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Apr 15, 2010
Here is what I have and what I want to do.
3 new 1.5TB HD. 1 used 1.5TB hd with 980MB of data. I want to set up a raid 5 with a hot spare. I have music, pictures, videos, and movies (About 2.8TB worth). I have had a mismatch of drives previously, 250GB, 2 320GB, 500GB, 2 1TB and now a 1.5TB all with data. I have removed the one 250 and 2 320s and put the data on the 1.5TB that is currently installed.
What I would like to do is create a raid5 with the three new 1.5TB HD's, copy the data over from the currently installed 1.5TB and then grow or add that drive as a hot spare. Or just add it and then add another 1.5TB down the road as a hot spare don't know for sure.
In addition since I have 2 1 TB drives, I could add 2 more (Good deals on 1 TB drives right now) and have a total of 4 1TB drives. Could I have 2 raid5's (4-1TB's and 4-1.5TB's)in two separate arrays? I really do not know if that makes sense or not but here comes LVM. I am tired of managing my HD space and since i have multiple folders (Movies, music, pictures, videos) and within the movies folder I have R, G & PG folders for the ratings of the movies. (Pwd protect the R so the kids can't get to it) So with LVM installed with the Raid5 I should be able to create my folders and just keep adding data and not worry about moving folders around when I grow the storage by adding new drives. Is that correct? Maybe someone could point me to a how to.
Also, if I create 2 arrays (And I need to know so I can order the 2 additional 1TB drives), then I could put all the music, G and PG content on the one array and all the R and spicy stuff on the other and password protect it.
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Jul 29, 2010
I just now re-installed 10.04 on my box, but now I can't get back into Windows. I'm getting the BOOTMGR not found error, that I'm familiar with, but the circumstances surrounding it are completely new to me. In the past I've encountered errors from hard-shutdowns where I couldn't mount the partition, until I checked it with windows first, but I can't boot into windows at all any more. I'm pretty sure my grub is pointing to the right location:
[Code]...
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Mar 5, 2010
I recently installed a new home backup server with Ubuntu 9.10 x86_64 using the alternate CD. I used the CD's installer to partition my disk and created a software RAID 5 array on 4 disks with no spares. The root file system is located outside the raid array.
At first the array performed nicely but as it started to fill up, the io performance dropped significantly to the point where I get a transfer rate of 1-2MB/s when writing!
[Code]...
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May 3, 2010
Created my own file server/nas, but get stuck in a problem after couple of months. I have a server with 4x 1,5tb disks, all connected to sata ports and 1 40gb ata133 disk running ubuntu 9.10 x64 amd. I've created a raid5 array using mdadm. It all worked great for couple of months but lately the raid5 array is degraded. disk sdd1 is faulting every few days. I have checked the drive but it is fine. If I re-add the disk and wait for 6 hours my raid5 array is all fine again, but after a few shutdowns, it is degraded.
my mdadm detail:
Quote:
root@ubuntu: sudo mdadm --detail /dev/md0
/dev/md0:
Version : 00.90
Creation Time : Mon Dec 14 13:00:43 2009
Raid Level : raid5
[Code].....
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Nov 2, 2010
I have ubuntu server 10.04 on a server with 2.8ghz 1gb ddr2 with the os on a 2gb cf card attached to the IDE channel and a software raid5 with 4 x 750gb drives. On a samba share using these drives I am only getting around 5 MB/s connected via wireless N at 216mbps and my router and server both having gigabit ports. Is a raid 5 supposed to be that slow? I was seeing speeds of anywhere from 20-50MB/s from other people and am just wondering what i am doing wrong to be so far below that.
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Aug 23, 2010
I installed Ubuntu as shown in the wiki and when I went to restart it gave me a lovely blinking cursor and nothing else. So I held down option, loaded into osx, reinstalled rEFIt and got my menu on startup. Unfortunately, the partition sync tool doesn't seam to be working, it gives me an error: Status: MBR partition table is invalid, partitions overlap. Error: Not Found returned from gptsync.efi
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May 7, 2010
A drive in a RAID array failed and as a result one of the partitions held on the LVM has corrupted. The result of LVS is below.
Code:
[root@brassxen3 ~]# lvs
LV VG Attr LSize Origin Snap% Move Log Copy% Convert
MGT VG_XenStorage-511bee02-d169-b418-6a9e-a88b7e3ce939 -wi--- 4.00M
[Code]....
This partition belongs to a virtual machine, the partition is not visible when booting this VM using a live CD or attaching it to another VM. When booting anything with this partition attached it takes hours to boot.
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Jan 4, 2011
After reboot I saw this communication:
Quote:
Target filesystem doesn't have requested /sbin/init. No init found. Try passing init= bootarg. and I can't shutdown the system normally because it stops (live cd too). Then I can't repair this partition because it is always busy. I have on this partition important files.
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Mar 18, 2010
I've built a server with (intentionally) very low-power components. The motherboard uses a Via C3 CPU running at 700MHz. The server has 512MB of RAM and I'm running 8.04 Server Edition (no GUI). This is purely a file server - not a lot of daemons started (except the defaults) -- no web server, etc. Just NFS, Samba and Open SSH (for remote administration). I'm not sure how much free RAM it has (it's down at the moment).
Is the RAM/CPU going to be inadequate for running software RAID5? I've done some big rsyncs and even without RAID, this thing is pretty slow. I'm not terribly concerned about the write speed, but if the read performance is going to be inadequate for playing (not streaming - just playing) a 720p MKV movie over my LAN, then I need to rethink this.
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