dir2xzm or mksquashfs ?

[roro]

Hi users,
instead of dir2xzm you can also use mkquashfs
I found it in the forum:
mksquashfs /home/guest/.mozilla/firefox/FirefoxProfile $PORTDIR/modules/fp.xzm -comp zstd -b 256K -noappend -no-strip

But why 256K (default is 128 Kbytes)
How to choose the block size?
mksquashfs is better because many parameters ?
But the parameters -noappend, -no-strip are completely incomprehensible to me.

As a beginner, it's difficult in Porteus.
I read diligently in the forum. I hope it gets me further.
Thanks

[M. Eerie]

Hi roro, welcome to the forum.
dir2xzm is a convenient function to create standard .xzm Porteus modules. Thus, dir2xzm calls mksquashfs with some predefined parameters to accomplish that task.

However, you can use mksquashfs with other parameters, should you need any other compression method (zstd, gzip, lzo, etc.).

But why 256K (default is 128 Kbytes)
How to choose the block size?

This is the chunk used to compress data. The bigger you choose it, the more compression you will get.
There's a downside to this. If your system has low resources (memory), you would run into trouble trying to decompress the data, so given that Porteus is conceived as a distro for people dealing with such systems, the 256k is a good compromise.

[roro]

thanks M. Eerie,
but what do the parameters mean -noappend and -no-strip

[donald]

-no-strip
act like tar, and do not strip leading directories from source files.

-noappend
do not append to existing filesystem.

https://www.mankier.com/1/mksquashfs