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Questions tagged [corruption]

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Why would files appear corrupt but then be fine days later?

The Setup: Dedicated CentOS 7 web server hosting a CRM database on a company’s internal network. Everyday, the server backs up to itself and then the backups are copied offsite. The Problem: This ...
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1answer
60 views

Recover from “FAULTED” zfs pool. “-F” option seems to be ignored

On Ubuntu, I recently started trying out ZFS on an external USB hard drive. I now seem to have a corrupted zfs pool, which probably happened simply as a result of me shutting down my computer (with ...
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1answer
26 views

How to test Snapraid data corruption?

I'm running Snapraid on my hard drives. However, I want to test it's data integrity features, to see how/if they actually work. But I don't really understand how to 'corrupt' my data. I can just ...
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1answer
36 views

Very strange disk corruption error

I have a server, where I deleted a large file. Let's call it ~/tempfile.txt. Somehow, the deletion didn't work properly, and the disk got corrupted -- meaning, du -hs * doesn't show that file existing....
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1answer
31 views

Track down multiple Mailboxes associated with a single user after a currupted database

Server is Exchange 2013 CU 22 running on Server 2012 R2. Backstory is a drive holding one of the 5 databases ran out of space and corrupted the database. I was able to use exeutil.exe to fix the ...
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1answer
132 views

InnoDB recovery from datafiles

First of all, my MySQL DB and Linux skills are not so good. I spent several days searching for a solution and tried several approaches. The following approach is the one I came furthest with. My SD ...
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1answer
47 views

Occasional output corruption on Nginx with PHP-FPM

I've got a PHP file generating a large amount of JSON (~1.5 MB) through an Nginx server and PHP-FPM, running on macOS. Occasionally (about 2% of requests), the outputted JSON becomes corrupted. The ...
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136 views

Next step when DBCC CHECKDB REPAIR_ALLOW_DATA_LOSS failes

I'm in a situation where a few Tables of a Database (MSSQL2016 - 13.0.5081.1) are corrupted (selecting data failes at some point) There is no valid backup available (the error seems to be present in ...
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24 views

What does it mean when 24 contiguous bytes in a file are corrupted? [duplicate]

I copied 500 MB of files from one hard drive to another and four files were found to be corrupted on the destination drive, each with one section that had 24 bytes different from the source. What ...
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1answer
27 views

Is it possible to recover Microsoft Office files from a flash drive when they were edited and saved on the flash drive directly?

Several .docx and .xlsx documents were saved on a flash drive, edited in word and excel applications, and changes saved directly to that flash drive again. These files, when opened, now contain only ...
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82 views

Is it possible to relink an Inode in EXT4 with it's original filename

Ok, so foolish idiot here, trashes his postgresql data directory, right at the very moment when his backup routine is currently in the "delete old files" and "create new files" phase. As a result, Iv'...
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1answer
32 views

Strange file corruptions in ext4

Recently I came in contact with what appears to be disk corruption scenarios, and I would like to understand them better. I have a build server which I work with daily. During one full build of a ...
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2answers
676 views

How does SSD meta-data corruption on power-loss happen? And can I minimize it?

Note: This is a follow-up question to Is there a way to protect SSD from corruption due to power loss?. I got good info there but it basically centered in three area, "get a UPS", "get better drives",...
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3answers
9k views

Is there a way to protect SSD from corruption due to power loss?

We have a group of consumer terminals that have Linux, a local web server, and PostgreSQL installed. We are getting field reports of machines with problems and upon investigation it seems as if there ...
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1answer
170 views

LVM - Should I encrypt physical volumes or logical volume?

I have two hard drives and I'm about to build a backup system. Now I'm wondering which solution would be the best. I encrypt disk1 and disk2. After mounting these I create a volume group and logical ...
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4answers
12k views

Apparently Robocopy does not understand Windows Server 2016 deduplication. Is there a way to make it work without corrupting the volume?

Scenario: Doing a server migration from old Server 2008 R2 to new Server 2016, following this Server Fault guide: File server migration using Robocopy After Robocopy completes, enable deduplication ...
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1answer
315 views

ext4 corruption leading to unbootable disk. Partition is mountable, but grub detects unknown filesystem

I'm trying to recover from a system disk corruption issue without having to reinstall the OS, which would be super-painful currently. I'm using Ubuntu 18.04, the affected partition is ext4 and on a ...
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0answers
256 views

Root cause for having a number of zero bytes in regular files

We have corrupt files that contain a number of zero bytes. I wonder what the root cause could be. What I know is: All kinds of files that were recently written are affected, they contain a number of ...
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1answer
456 views

Corrupt `reverse i-search` database: why and how?

I made a recording of this as it's never happened to me before and seemed pretty weird: https://asciinema.org/a/qVSUzkIX2wLia7EzCFhCYHb9Q Under which conditions would the bash completion database ...
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1answer
366 views

Mapped VMDK no longer accessible - VMware ESX - recover data

At my company we have a virtual Windows 2012 R2 server running on VMware ESX. The server has 3 disks attached on different LUNs. (Disk 1 & 2 are on a smaller LUN containing multiple servers that ...
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2answers
818 views

Why isn't TCP corruption more noticeable?

First of all, apologies if this seems a somewhat simplistic question. According to this answer, TCP packets are corrupted all the time without the checksum catching it. If this happens so often, ...
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1answer
6k views

Corruption of in-memory data detected: where does the issue lie?

We are experiencing crashes on our SSD VPSes, all working on KVM: crashes occur for different reasons; in the hurry to restore the service my team uses to reload a previous snapshot of the machine and ...
3
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1answer
332 views

Does Perkeep (camlistore) have built in protection from bitrot?

Does Perkeep (PKA Camlistore) offer protection from silent corruption (eg. bitrot) of the data in its current design like what is offered in ZFS. If it does, how well does it fare when compared to ZFS?...
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2answers
411 views

What scale of data loss or corruption do I risk if I enable the write buffer on a file server?

I have found plenty of articles online warning of risk of data loss or corruption for drives with write-buffer enabled in the event of power loss. However, I haven't found any that actually refer to ...
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3answers
964 views

ZFS-HA pool faulted with metadata corruption

I setup the ZFS-HA following the excellent description Github (see here). After extensive testing, I rolled the setup out to production using 5x12 disks in RAIDZ3 connected to two nodes using HBA ...
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0answers
33 views

Files saved to Samba share are randomly differing from originals?

I manage a small network of windows clients and a BSD file server running Samba 4.6.x. We had some odd issues which led to the discovery that when users save files to the server, about 12% of the ...
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1answer
1k views

CRC error in several compressed files

I have a server which backs up itself on another server with duplicity (actually duply). The full backup is about 330 1-GB files. The full backup finished without problems, but the next day the ...
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1answer
524 views

File System Corruption in AWS Storage Gateway Volume

Has anyone had to deal with a corrupt file system on a storage gateway volume? One of my volumes is now telling me that it's corrupted or unreadable. I've tried running a chkdsk /r on it and it took ...
6
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2answers
11k views

How to repair a broken-resized qcow2 disk image for libvirt/kvm?

Today I wanted to increase the size of a VM, so I did what I always do (have done it before): qemu-img resize diskimage.qcow2 +22GB Then the file broke and the VM does not start any more. I tried ...
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2answers
13k views

Risk of not repairing “Structure needs cleaning” XFS errors

I have an XFS file system with file system errors affecting some non-critical files. I wish to repair it; the business wishes to continue to run with those errors. What are the known risks of not ...
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1answer
375 views

mysql keeps crashing corrupt databases

I have been trying to solve this for about 8 hours now. Due to unrelated issues, I had to remove mysql and re-install it. since then, mysql crashes and restarts every 2-3seconds with the below in the ...
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2answers
575 views

How to corrupt a file without changing attributes for integrity testing?

I'm trying to create a process for comparing two folders that should contain exactly the same files. Would like to be able to modify a file's content without changing the attributes as if the file was ...
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0answers
77 views

How to find the cause of a single event file content corruption?

A few days I copied a large (56GB) file from a workstation to a file server. After checking the copy I found out it had a few bytes different from original. Details: source system: Medion Akoya ...
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1answer
111 views

Database Index files get corrupted if shared folder resides in Win Server 2012 but not if it resides in a regula Win 7 PC Shared folder

Database application programmed for peer to peer access to a shared folder experiences database associated index files corruption if said shared folder resides in Win Server 2008 or Win Server 2012. ...
2
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1answer
404 views

ZFS corrupted directory, but zpool doesn't detect anything wrong

A directory on my FreeBSD 10.2 server somehow got hopelessly corrupted (wasn't ZFS supposed to prevent that?) ls or any other command against it leads to current session getting frozen on the kernel ...
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1answer
1k views

Two LVM volumes on a shared storage. Will it lead to data corruption?

I have a setup in which one SAN storage connected by FibreChannel is accessible by two hosts (at block level). And I want to create two lvm2 physical volumes on the storage: pv1 and pv2, for now being ...
3
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1answer
690 views

Ensuring VMware ESXi storage integrity?

I'm planning a small ESXi standalone server to host a number of VMs I use here. I haven't decided what facilities to use from the wider vSphere system. The underlying VM storage is local HDD RAID ...
0
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2answers
1k views

How to avoid file corruption upon power shortage

I have an industrial PC (Windows posready 7) running a server application that was corrupting files too often when the pc was abruptly turned off (power shortage) and I found that changing my code to ...
0
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0answers
561 views

System File Corruption causing Freezing a KSOD

At present we are having some difficulties with one of our Terminal Servers. It is a VM Server 2012 (64bit) What is happening at the moment is that random applications (IE, Chrome, Notepad, Word, ...
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81 views

Active Directory Corruption

We are looking at the topic of DR at the moment and I would like your expert help in the creation of a DR plan in the event that our Active Directory somehow becomes corrupt. We have 4 domain ...
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0answers
718 views

File System is corrupt Windows Server 2012 R2

I keep recieveing an "The file system is corrupt" error on a new Dell powerEdge T430 Server running windows server 2012 r2. I am running in a RAID 5 config with 3 Kingston 960 GB Enterprise SSD's. I ...
0
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1answer
884 views

Are zero byte files an indication of file system corruption?

I recently noticed a strange behaviour. I could not restart a productive webserver running since more than a year because the configuration was invalid: # /etc/init.d/apache2 restart Syntax error on ...
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2answers
88 views

Database log file corruption in SQL Server 2005

I've been going through data corruption from last 2 days in row that .ldf getting corrupted and I've to fix it. I did my research that I need new server and management studio because whatever we used ...
2
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3answers
1k views

Exchange 2013 database corruption with event 476 in ESE

I'm having some random database corruptions on our Exchange Server 2013 with event 476 on ESE. This is the fifth time that this happens and the situation in already unacceptable. Here's an screenshot ...
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2answers
1k views

zfs checksum error in raidz1 vdev but not in disk

I am backing up data stored in a zpool consisting of a single raidz vdev with 2 hard disks. During this operation, I got checksum errors, and now the status looks as follows: pool: tmp_zpool state:...
4
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0answers
4k views

Corrupt WiredTiger MongoDB files

I'm running MongoDB with the WiredTiger engine on an ext4 file system. The last thing that I did was start building an index, but then something came up and I needed to cancel the index build and ...
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0answers
611 views

elasticsearch glibc memory corruption

My elastic search clusters keep crashing for no reason. All I can see in the logs is : INFO | jvm 4 | 2015/04/17 19:10:09 | *** glibc detected *** /usr/java/jre1.7.0_04/bin/java: malloc(): ...
3
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1answer
6k views

Server with multiple replicate=do-db entries

I have a server that someone has setup which are acting as a master-master on both servers. Since they have been configured as both master on the same database, changes in one end has caused all sorts ...
5
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1answer
169 views

Active Directory Users - All Attributes Suddenly Blank

We had an instance yesterday where approximately 130 of our well over 5,000 user objects suddenly became corrupted. Every attribute you can possible set with the exception of sAMAccountName and cn ...
0
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2answers
935 views

Purposely corrupt folder name?

I want to intentionally corrupt a folder name so I can test a script on it. Currently the folders are named similar to : 37ee0500-52c0-4a18-861e-0084EF05FB and are located in: /user/members/local/ ...

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