All fields in ext4 are written to disk in littleendian order. The superblock could not be read or does not describe a valid ext2ext3ext4. This is as simple as running fsck command against your required file system as shown below. Bad magic number in the superblock while trying to open devhdb5 devhdb5. Bad magic number in superblock while trying to open devsdb. Jul 15, 2009 using the info from the first command, fdisk and the uuid number from the second command, blkid, you can work out which device has which uuid number.
Bad magic number in superblock while trying to open devxvdj. Drive is new and had a fresh install of f20 that was upgraded to f21 a few weeks ago. What to do when you saw bad magic number errors in solaris. Sep 08, 2011 bad magic number magic number wrong very often, the bad information in the primary superblock might not have been propagated to the backup superblocks. In this scenario, im going to explain how execute file system check fsck on xen vm virtual machine which are failed in automatic fsck check. To repair the boot disk, type in the following command, then press enter. Bad magic number in inode while trying to determine heartbeat information marge. Problem seems to have occurred after most recent update. The q option should be specified if the image is to be archived or provided for diagnostic. If the device is valid and it really contains an ext2ext3ext4 filesystem. How to resolve bad magic number in superblock error ux. After rebooting, the management console reported that the system had not compl. Bad magic number in superblock while trying to open devmappertoast.
Very often, the bad information in the primary superblock might not have been propagated to the. Bad magic number in superblock while trying to open devsdc1. For ext3 and ext4 filesystems that use a journal, if the system has been shut down. Bad magic number in superblock while trying to open devsdb the superblock could not be read or does not describe a valid ext2 ext3. Then make sure in your etcfstab file, you refer to devices using uuidxxxxxxxxxxxxxxx instead of devsdxx.
For ext3 and ext4 filesystems that use a journal, if the system has been shut down uncleanly without any errors, normally, after replaying the committed transactions in the journal, the file system should be marked as clean. Bad magic number in superblock while trying to open devsdb1 and e2fsck reports a similar error. Attempting to extend filesystem in rhel 7 returns bad magic number in superblock solution verified updated 20151028t14. Bad magic number in superblock while trying to open. We dont want to have gpt support normally and be missing it for data. The book covers a broad range of system administration topics such as managing printing services, managing terminals and modems, managing system resources disk quotas, accounting, and crontabs, managing system processes, and troubleshooting solaris software. Bad magic number in superblock while trying to open devloop1 fsck. To remove the bad file block, run the fsck command on either a specific partition e.
Bad magic number in superblock while trying to open dev. Repair a broken ext4 superblock in ubuntu linux expresso. So unless you enable the writeback journalless, then most of the time, your metadatafilesystem table should be in sync with your data files. Bad magic number in superblock while trying to open devsdc. Bad magic number in superblock while trying to reopen e2fsck. Fsck will manage the filesystem checkers so that only one of them will display a progress bar at a time. Repairing linux ext2 or ext3 or ext4 file system fsck.
The e2image8 utility can be used to create a metadata image prior to repair for diagnostic or testing purposes. Bad magic number in superblock while trying to open devloop1 comment 7 dick gevers 20141127. Bad magic number in superblock while trying to open devsdel. Rebooted esx now has superblock problem vmware communities. How to resolve bad magic number in superblock error ux techno. You can pass the b flag to display any blocks reserved as bad in the filesystem no output implies to badblocks. Attempting to extend filesystem in rhel 7 returns bad. Recover corrupted partition from a bad superblock nixcraft. If the device is valid and it really contains an ext2 filesystem and not swap or ufs or something else, then the superblock.
The man page says it supports onlne ie while mounted resizing of ext3 with 2. Bad magic number in superblock while trying to open devsda3 the superblock could not be read or does not describe a correct ext2 filesystem. How to repair hard disks with fsck on macos make tech easier. Running fsck and automatically fix any errors encountered. This book is for anyone who is responsible for administering one or more systems that run the oracle solaris operating system os. Bad magic number in superblock while trying to open devmd1 the superblock could not be read or does not describe a valid ext2 ext3 ext4 filesystem. How to repair a corrupted usb drive in linux make tech easier.
The superblock could not be read or does not describe a. Hi everyone, due to high load io, i cant mount my ocfsv2 partition. Oct 23, 2006 what to do when you saw bad magic number errors in solaris. I recently had to reboot the host due to a network issue. Hence we have chances to use a backup superblock for the fsck command to save the corrupted filesystem. However, all fields in jbd2 the journal are written to disk in bigendian order. How to repair a corrupted usb drive in linux make tech. Debian user forums view topic bad superblock on ext4. If the device is valid and it really contains a ext2 filesystem and not swap or ufs or something else, then the superblock is corrupt, and you might try running e2fsck with an alternate superblock. Bad magic number in inode while initializing the dlm the disk is an iscsi device, there are no block damaged. If you dont know the alternate superblocks and created the partition using newfs command, then you can use the n option to print out the superblocks without actually recreate the file system. Dave, i always recommend running the fsck after a number of reboots, but not every time.
Errors in dmesg indicated a bad magic 41ed from ext4fs see logs in additional info section. Bad magic number in superblock while trying to open devsdf the superblock could not be read or does not describe a correct ext2 filesystem. Result was more corruption as fsck by default assumes ext2 file system. These binaries are run automatically at boot time and their behavior differs based on the filesystem being checked and the state of the filesystem. How can i recover a bad superblock from a corrupted ext3 partition to get back my data. If the device is valid and it really contains an ext2ext3ext4. Bad magic number in superblock while trying to open devsdd the superblock could not be read or does not describe a valid ext2 ext3 ext4 filesystem. Bad magic number in superblock while trying to open devsdb devsdb. If the primary superblock of any filesystem referenced in the vfstab, to automatically mount during booting is corrupted, the system will fail fsck during bootup with the following message.
If the device is valid and it really contains an ext2 filesystem and not swap or ufs or something else then the superblock is corrupt, and you might try running e2fssck with an alternate. If your filesystem is now so corrupt it wont mount you have two options. I tried running fsck last night and got the following response. Bad magic number in superblock while trying to open devsda3 devsda3. It is based on ext3grep and extundelete, but was rewritten from scratch. The vm was showing offline and inaccessible via node. The r option should be used for testing purposes in order to create a sparse file of the same size as the filesystem itself. Recently, one of our sys admin run the command on ext3 file system wo specifying file system. Using the info from the first command, fdisk and the uuid number from the second command, blkid, you can work out which device has which uuid number. Bad magic number in superblock while trying to open devsdd the superblock could not be read or does not describe a valid ext2ext3ext4 filesystem. Bad magic number in superblock while trying to open devsdel devsdel. Bad magic number in superblock while trying to open devsda6 the superblock could not be read or does not describe a correct ext2 filesystem. If fsck output shows superblock read errors, you can do the below to fix this problem.
Fsck will manage the filesystem checkers so that only one of them will display a. The superblock could not be read or does not describe a valid ext2 ext3 ext4. Log in to your red hat account red hat customer portal. Need some serious help to protect my file through fsck in linux. Hdd sda1 mounts but wont boot 1tb hdd, ext3, desktop ubuntu.
Bad magic number in superblock while trying to open hup. Bad magic number in superblock while trying to open devhdb1 the superblock could not be read or does not describe a correct ext2 filesystem. Attempting to extend filesystem in rhel 7 returns bad magic. If the device is valid and it really contains an ext2 ext3 ext4. Bad magic number in superblock while trying to open devsdb1 the superblock could not be read or does not describe a correct ext2 filesystem. The resize2fs program will resize ext2 or ext3 file systems. Oct 16, 2005 finally, run fsck on the partition, enter. Linux ext2ext3 superblock recovery kezhongs weblog. Bad magic number in superblock while trying to open devloop1 last modified. If you know the alternate superblocks, then you can fsck the partition. Need some serious help to protect my file through fsck in.
It causes mke2fs to reinitialize the superblock and group descriptors, while not touching the inode table and the block and inode bitmaps. The first thing to do is to do a file system check using fsck utility. It appears that resize3fs may not support ext3 in any way for some or all of the 2. I try to modify the signature with bvi but the result is the same. Bad magic number in superblock while trying to open devsdb the superblock could not be read or does not describe a correct ext2 filesystem. After that, i checked if i can create and copy files. Bad magic number in superblock while trying to open devsda6 couldnt find valid filesystem superblock. The number of block groups is the size of the device divided by the size of a block group. This option is the same as the l option, except the bad blocks list is cleared before the blocks listed in the file are added to the bad blocks list. Unable to resolve label and youll get many hits so it may be an upstream problem. Set the bad blocks list to be the list of blocks specified by filename. Oct, 2016 to remove the bad file block, run the fsck command on either a specific partition e.
Once completed, the usb drive will have a healthy partition again and be fully operational on linux. The superblock could not be read or does not describe a valid ext2ext3ext4 filesystem. Bad magic number in superblock while trying to open devsdb1 and e2fsck reports a. Bad magic number in superblock while trying to open devsdb the superblock could not be read or does not describe a valid ext2ext3. Bad magic number magic number wrong restore primary.