4
votes
Accepted
Can I get rid of "ext4-rsv-conversion" process?
Since version 4.3 of the kernel, Ext3 file systems are handled by the Ext4 driver. That driver uses workqueues named ext4-rsv-conversion, one per file system; there is no way to get rid of them.
- 481k
3
votes
Accepted
What happens if you never ever run e2fsck?
An ext* filesystem has a couple of values in the metadata; how many times a filesystem can be mounted before it should be checked, and how long between checks should be allowed.
These values can be ...
- 49.3k
3
votes
Optimize ext4 for always full operation
In principle, I don't see why strict ring-buffer writes would pose any challenge regarding fragmentation. It seems like it would be straightforward. The quote sounds to me like it is based on advice ...
- 53.5k
2
votes
UUID of a drive that won't show up in /dev/disk/by-uuid or blkid
You ask,
Is there a way to get a UUID for this partition?
You can also use: lsblk -f to get UUIDs.
- 121
2
votes
Optimize ext4 for always full operation
Here's an alternate approach, however it's somewhat involved.
Create many smaller partitions, let's say 10 or 20 of them. LVM2 might come in handy in this scenario. Then use the partitions in a ...
- 219
2
votes
why can gnome disks not format ext2 or ext3?
You'd have to ask the gnome developers to be sure, but the gnome project has a general policy of reducing complexity (and choice paralysis) by eliminating choices. My guess is that the reasoning is ...
- 83.9k
2
votes
File timestamps precision - ext3 with nanoseconds, ext4 with milliseconds
The actual support for nanoseconds vs seconds resolution depends on the size of the inode chosen at format time. 128-byte inodes support only second resolution, 256-byte inodes support nanosecond ...
- 2,002
2
votes
What can cause a difference of 3 gigabytes on two identical trees?
Yes, they will have different disk usages, depending on how EXT4 was tuned it could have 256 or 128 byte inodes, allocation for directories could be different, and small files can take up differing ...
- 176
1
vote
Accepted
How to resize root ext3 file system without LVM
UPDATE - I found this answer, and the others, to be quite helpful. You may want to compare those too.
You need to do like this:
swapoff, thus "freeing" the swap partition
fdisk, and delete ...
- 4,695
1
vote
Issue with device after formatting
TL;DR
The lost+found directory you now have is not the same as the one you saw before. It is correct and you should just leave it.
What creates this directory?
The lost+found directory is created ...
- 19.1k
1
vote
Can I resize a filesystem without resizing the partion in advance?
You can (and should) certainly shrink a filesystem before shrinking the partition, though not necessarily - if you shrink the partition first, unless you create a new partition, nothing should write ...
- 1,873
1
vote
Accepted
Convert / and /boot from ext3 to btrfs
Yes, it's possible to convert an ext3 filesystem to BTRFS. Use btrfs-convert.
Yes, the filesystem needs to be unmounted; btrfs-convert uses the filesystem's free space to perform the conversion, so ...
- 7,496
1
vote
filesystems: recovering filenames from ext4 when there is no root inode or journal?
Running e2fsck is normally the best way to recover a filesystem, and it can do a remarkably good job even if part of the filesystem is missing. This is because ext2/3/4 use a relatively static layout ...
- 2,002
1
vote
Is there any way to perform fsck automatically after power failure?
To force fsck on each boot, set the count-down to 1 in the root filesystem:
tune2fs -c 1 /dev/mmcblk0p2
If tune2fs is not installed, it can be found in the e2fsprogs package.
- 2,976
1
vote
Accepted
What is the most recent technique to implement quotas?
Is the quota approach still in use?
Yes it is. Since disks have grown in size, quotas might not be of much worth to common users, but still find their usage in multi-user environment e.g. on servers. ...
- 478
1
vote
Optimize ext4 for always full operation
The problem is almost certainly caused by the ext4 delalloc (Delayed Allocation) default ext4 mount option. It causes the decision of where to write new files to be delayed until sync (either explicit ...
1
vote
How are the reserved GDT blocks used after online resizing in ext3 file system
These blocks are kept for future resizing, until the filesystem reaches 1024x the original formatted size, or the filesystem hits 16TB (at which point a different resizing method is used).
If you ...
- 2,002
1
vote
How to extract raw ext3 inode data from disk?
I wanted to do something similar and ended up using debugfs similar to the other answer, but used the following (where my root file-system is on /dev/nvme0n1p4):
$ debugfs
debugfs: open /dev/...
- 1,569
1
vote
UUID of a drive that won't show up in /dev/disk/by-uuid or blkid
Traditionally /dev/disk/by-uuid/ is meant for filesystem UUIDs. With GPT partitioned disks, there is actually a UUID associated with a disk (in additition to UUIDs associated with partitions as part ...
- 193
1
vote
UUID of a drive that won't show up in /dev/disk/by-uuid or blkid
Even when the partition uses the whole disk, and the partition is mounted, the UUID may still be missing from /dev/disk/by-uuid and from blkid output.
Ways to see the UUID for such a partition, let's ...
- 585
1
vote
UUID of a drive that won't show up in /dev/disk/by-uuid or blkid
I could also not get the UUID from blkid and sudo file -s /dev/sda1 worked for me and I was able to get a UUID.
- 11
1
vote
How to compact a directory
Not exactly an answer, but I think it's worth mentioning here, that there was a patch to fix this inability to shrink the directory:
https://www.spinics.net/lists/linux-ext4/msg71205.html
I hope it ...
- 161
1
vote
How to deliberately fragment a file
I happen to stumble on a situation that needs to generate a fragmented file in Linux ext4. I did so by calling fallocate, which, can be used to punch holes given a file, this will recycle the hole to ...
- 111
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