i wonder what was the intended use of ext4 reserved blocks

… and how many TBs of space are wasted on them because junior sysops don’t know you can reduce it to 0.1% from the default 5%. still baffles me how that’s a cold 50GB getting wasted on a 1TB SSD

@domi recovering from out of disk space situations as root. but the percentage was set in an era where disk size was measured in gigabytes

@asie @domi and now it's useful in other way: to extend the life of your ssd!

@asie even back then 5% barely made sense, IMO

@asie @domi i'd say do not underestimate anyone's ability to produce 50 GB of unnecessary log files

@IngaLovinde @asie [citation needed], i’m running LUKS on virtually all machines so at best it has no effect

@domi @asie I mean ssds degrade faster when they're full and still have a lot of writes, because then you don't get much write leveling and end up rewriting the same physical blocks over and over again

@IngaLovinde @domi @asie yeah but luks disables trim my default which makes the disk always full at some point

@IngaLovinde @asie @domi imo it’s the wrong default as trim doesn’t reveal the data, it could reveal which parts of the disk is no longer in use. might be Something relevant if your threat model includes an attacker that regularly dumps the encrypted disk but has no access to decrypted data. which a thief is not [my threat model]