Change EXT4 commit root parttion

[Member mustdos]

I have an active root partition that I want to change it’s time to commit to a few minutes; how do I safely do that?

• This topic was modified 7 months, 4 weeks ago by mustdos.

[Member sybok]

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Hi, your post does not make clear (at least to me) what/how do you wish change it.
Could you please elaborate?
E.g. do you wish to resize or convert to another file-system or something completely else?
Best way would probably be to boot a live USB to ensure the root partition is not mounted/actively used.

BEWARE: Any such change in partition is potentially dangerous.
I used a live USB to resize Windows partition once. Unfortunately, the system in live-USB froze/crashed thus messing up Windows beyond repair.
This was a single (and painful) incident of this type in many successful uses of live USB.

[Member mustdos]

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I have a laptop with one HDD and multiple partitions.

I want to change the commit time so I won’t have to keep the HDD awake while I record a game.

[Member mustdos]

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The entire HDD is ext4 partitions so no need to worry about windows

[Member sybok]

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Unfortunately, I had no idea what a “commit time” is. Fortunately, web search helped:
https://www.man7.org/linux/man-pages/man5/ext4.5.html
https://unix.stackexchange.com/questions/155784/advantages-disadvantages-of-increasing-commit-in-fstab
Thus you wish to re-mount your root with new value of commit time.

Then, the changes I can think of are the following:
1) Permanent change:
A) Backup and appropriately edit ‘/etc/fstab’
B) Force re-mount using e.g. ‘mount -a’ (?)
2) Temporary change (up to reboot):
‘mount -o remount,<options> <device> <target folder>’

See man page of ‘mount’.

Unfortunately, I am not 100% sure what is safer and this is my best guess (not quite sure how it behaves in the case of root partition).

[Member mustdos]

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Here’s my /etc/fstab

# Pluggable devices are handled by uDev, they are not in fstab
UUID=daf10bc5-a40d-4981-9504-f27448c747f9 / ext4 noatime 1 1
UUID=cbd1dbc5-13bd-4d5a-bd19-ce71f69d8874 swap swap defaults 0 2
UUID=E8C5-AE3A /boot/efi vfat noatime,dmask=0002,fmask=0113 0 0
#-> /dev/sda4
UUID=ee0f0c73-f3c5-4966-8928-f489d81d46ef /media/ee0f0c73-f3c5-4966-8928-f489d81d46ef ext4 noauto,exec,users 0 0
#-> /dev/sda5
UUID=9b550efe-7817-406d-9e5d-541b469e2eec /media/9b550efe-7817-406d-9e5d-541b469e2eec ext4 noauto,exec,users 0 0
/dev/cdrom /media/cdrom iso9660 noauto,users,exec,ro 0 0
/dev/cdrw /media/cdrw iso9660 noauto,users,exec,rw 0 0
/dev/dvd /media/dvd udf noauto,users,exec,ro 0 0
/dev/dvdrw /media/dvdrw udf noauto,users,exec,rw 0 0
/dev/sr0 /media/sr0 auto noauto,users,exec,ro 0 0

NVM, I guess I have to reboot

• This reply was modified 7 months, 4 weeks ago by mustdos.

[Member mustdos]

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UUID=ee0f0c73-f3c5-4966-8928-f489d81d46ef /media/ee0f0c73-f3c5-4966-8928-f489d81d46ef ext4 noauto,exec,users,data=journal,commit=600 0 0

For anyone viewing, please validate that’s safe to reboot on.

• This reply was modified 7 months, 4 weeks ago by mustdos.

[Member mustdos]

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Plus, the /dev/sda2 doesn’t show here; how do I modify it’s commit time?

[Member mustdos]

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Will the data also flush after being suspended (closing the laptop lid even for over 10 minutes) or the timer continues only after being fully awake?

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