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Questions tagged [ext4]

Ext 4 is a linux filesystem.

Ext4 is a filesystem mostly used under linux. Other versions are ext, ext2 and ext3.

See Wikipedia for details on ext and ext4.

316 questions
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Is small size file read/write slower when the file gets bigger?

I am on Ubuntu 12.04 using ext4. I wrote a python program that does small size (mostly 512 byte) read and write with somewhat random access pattern. I found that as the file gets larger and larger. It takes more and more time to do the same number…
dividebyzero
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How to recreate a rootfs with an .ext4 file

I have an embedded device with an emmc and a qspi-flash, both of which have an operating system on them. From the OS running in the qspi-flash, I have a rootFS.ext4 file, the entire root filesystem for the OS on the emmc. From the qspi, I can see…
alexv9
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Ensuring completenes of file writes on Linux ext4 file system

Our (embedded) Linux system has an ext4 file system. Now, one of our apps there needs to modify data files using simple file write APIs. The requirement there is that the file updates should be atomic - not in the sense of parallel writes from…
dsaada
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Dropbox sometimes generates a boot failure of the EXT4 partition on Ubuntu

Dropbox sometimes generates a mounting failure of an ext4 partition while booting the Ubuntu desktop PC. At that time, the log message was as follows: ...... Omission ...... ata2.00: status: (D32F ER3 ) ats2.00: error: ( UNC ) blk_update_request:…
user1275872
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Why EXT4/JBD2 after mounted keeps calling ext4_journal_stop?

I was investigating the journaling layer used in the EXT4 (JBD2) and I added some printk to see the behavior of the ext4_journal_start and ext4_journal_stop functions being called. This is the procedure: I first format a given partition…
campescassiano
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Disk access during file copy and rename in ext4

I have a process let's say 'A' whose job is to copy three 4 GB files to a temporary file and then rename it by overwriting to an existing file. 'A' does this every 15 minutes. The CentOS version is…
John Subas
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Python OSError No space left on device

Im writing a lot of files to a folder, no subdirectories, however after 2.8 million files this error shows up: with open(bottleneck_path, 'w') as save_file: OSError: [Errno 28] No space left on device: '/home/user/path/redacted' I've checked the…
Wesley
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ext performance handling millions of files

I have a filesystem with 40 million files in a 10 level tree structure (around 500 GB in total). The problem I have is the backup. An Incr backup (bacula) takes 9 hours (around 10 GB) with a very low performance. Some directories have 50k files,…
Sergio
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resize2fs LVM root on CentOS 6.6 64-bit guest on XenServer 6.2

All the preparations to grow the ext4 root LVM partition on CentOS 6.6 64-bit running on XenServer 6.2 have been completed. Grow the xvda virtual disk on XenServer - check. Create xvdaN as LVM on CentOS guest using fdisk - check. pvcreate…
Statler Waldorf
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What filesystem is Windows compatible with?

What filesystem can Windows 7 be installed on except ntfs, because i need to change my file system via installing ubuntu and the option of making my hard drive ntfs is not available. Also currently my filesystem is ext4
frebk
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Securing source code of each site running on apache server

I have setup an instance of apache server(on ubuntu 12.04) and hosting two php websites on it. Websites are maintained by different teams and they don't want the code to be visible to the other team. The code for websites is present in directories…
Amit Khanna
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Strange bug happened with rails/git

I've experienced a strange bug with rails 3.2 / git. In development mode, classes was not reloaded between requests (controllers, models, helpers) but views work. I've searched a long time in unmodified configuration (application.rb,…
m4tm4t
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Ext JS empty ItemSelector when loaded for the First time from a JSON response

I am creating a form with Itemselector using extjs 4. I am using Json for store where I have the JSON response as…
aswininayak
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Backup or snaphot tool for ext4

I'm looking for a backup tool for ext4, which can take a copy from a running fs like /var with no collisions after recover such fs. I know BSD dump has an '-L' option, which tells him to work on a snapshot. But nor dump nor dumpe2fs from repository…
tijagi
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who created/coded ext4lazyinit for ext4?

I have been trying to figure out who the author of ext4lazyinit ? I tried searching on lwn.net, didn't get anything. I tried using - ┌─[shirish@debian] - [/usr/share/doc/linux-image-4.9.0-1-amd64] - [10080] └─[$] zless changelog.linux.gz I tried…
shirish
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