Server Fault Stack Exchange
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Questions tagged [data-recovery]

Reclamation of deleted or otherwise removed/corrupted data (files)

Reclamation of deleted or otherwise removed/corrupted data (files). The level of complexity of such a task varies from simply "Restoring" a file (from a Recycle Bin) to using advanced tools to analyze the filesystem and rebuild previously deleted/corrupted data.

433 questions
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Recovering from a rm -rf /

Edit: This is a hoax. I run a small hosting provider with more or less 1535 customers and I use Ansible to automate some operations to be run on all servers. Last night I accidentally ran, on all servers, a Bash script with a rm -rf {foo}/{bar} with…
Marco Marsala
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How to recover XFS file system with "superblock read failed"

I have a disk from a Buffalo LinkStation that has an XFS partition on it that I cannot mount. Plugging the disk into an SATA->USB caddy on an Ubuntu box. I get the following: $ sudo fdisk -l /dev/sdb Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255…
Kieran
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Is there way to read sectors from SATA drive without ECC correction?

I know, there was such possibility like that in old ATA standards: "READ LONG" command produced LBA sector + ECC payload. sg_read_long supports in in linux, but the command is obsolete for quite a long time, so I'm not surprised, that my HDD does…
darkk
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Break up a dd image into multiple files

I'm doing some data recovery from a hard disk. The disk has about 300GB of data on it, but I lack another hard drive that has 300GB of free space. I have three HDs, with 150, 40, and 120 GB free. For the creation of the first chunk, I was…
lfaraone
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Recover data from SCSI hard disk

We've got an old server with SCSI hard disk. The server crashed last week and it isn't exactly known what hardware component is damaged. Since the server is due to be retired anyway we don't want to repair it but just restore the data from the SCSI…
Tom
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Join large overlapping files

I am trying to recover a (MySQL) database from a crashed disk. There are a number of recent dumps, which are corrupted bz2 files. Since the database does not change often, the dumps should be nearly identical. bzip2recover recovered about 70-80% of…
Tgr
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Does one failed drive + one single bad sector destroy an entire RAID 5?

During planning my RAID setup on a Synology Disk Station I've done a lot of reading about various RAID types, being this a great reading: RAID levels and the importance of URE (Unrecoverable Read Error). However, one thing remains unclear to…
adamsfamily
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Recovering lost VHDX / VM (deleted by Veeam)

Earlier this week a VM on one of our hypervisors experienced extended downtime (~24 hours) due to some Windows updates going wrong. I ultimately was able to fix the issue, and noticed yesterday that Veeam wasn't backing up the VM anymore as part of…
Kevin Jones
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Fix RAID 5 with two drives containing bad blocks

Assume the following situation: An administrator was not careful enough maintaining a NAS server (QNAP QTS 4.3.3) using RAID5 and it has already reached a situation in which two (out of four) drives contain bad blocks, however no drive failed…
Dan
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ZFS - Recover or repair a corrupted file in a snapshot from backup?

A pool has suffered permanent data corruption to file data that's part of a snapshot. If the file data was part of the filesystem (and not part of any snapshot), I could simply recover the file from a suitable backup copy. How can I recover or…
Kenny Evitt
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What are my prospects of recovering old version of file on BTRFS

I've accidentally overwritten an important file on BTRFS. Knowing that this filesystem is COW, it should be in theory possible to recover an old version of the file. Unfortunately googling didn't reveal relevant information. Can someone please…
Adam Ryczkowski
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How to recover data from a corrupted ext3 partition?

A server of mine had a drive failure of some sort which caused the OS (CentOS 5) to crash and stop working (it refuses to boot). So we put another drive with a working OS and from there we try to mount the partitions in the old drive. Most…
GetFree
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SpinRite and USB blues - does a solution exist?

I use SpinRite to recover hard disks and their content, and to a lesser degree for preventive maintenance. However, if a USB drive (USB thumb drive and/or external hard disk with a USB interface) is connected when SpinRite scans for devices, then…
Peter Mortensen
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How long should I expect CheckDB with REPAIR_ALLOW_DATA_LOSS to run

I am running CheckDB with REPAIR_ALLOW_DATA_LOSS on a Shairpoint search DB that is 47mb It has been running for > 30min. Is that normal? How long should it take?
Sruly
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Ext4 superblock corrupted after successful(?) mdadm grow and resize2fs

Some system details AMD Phenom II X6 1090T, 16GB DDR3 1600 running 11.04 natty, 2.6.38-8-server Raid in question consists of 5 SATA drives; 4 Samsung, 1 Western Digital; 500 GB each Drives are connected to a LSI SAS 9201-16i Host Bus Adapter…
lose_the_grimm
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