Hi all,
I'm planning to install LFS (8.3-systemd) on a cheap laptop that uses built-in eMMC
memory (64GB) instead of an internal hard drive. As far as I understand, eMMC is
cheap flash memory, similar to what's used in SD cards and USB drives. I've been
trying to figure out what needs to be done differently in this situation given the
peculiarities of flash memory, in particular the limited number of write cycles
that leads to wear & tear on the drive:
I've read that flash memory is not a good choice for a swap partition due to
its slow read/write access times, and due to the limited number of write
cycles. The system has 4GB of RAM, so I'm considering to skip the swap
partition altogether. If unavoidable, I could use an external USB hard drive as
a swap drive during compilation, but I don't think that would be necessary.
For the root file system, it seems that journalling (ext3, ext4) should be
avoided on flash memory. Is ext2 a good choice here? What about the 'discard'
mount option? Should the drive be mounted with the 'noatime'? Does anybody have
experience with this?
I've read about the 'flash-friendly file system' (F2FS), which seems to be
tailored to such application. It appears as if it's supported by the kernel,
and there are user-space utilities (f2fs-tools). These are not included in LFS
or BLFS, but I'm guessing that I could compile those anyway. Is that a suitable
option for the LFS root file system? Has anyone tried doing something like this?
Is it advantageous to construct LFS on a partition on an external USB hard
drive, and move them to the eMMC drive once it's complete? If yes, are there
any pitfalls here?
That's all I can think of. Am I missing something? I guess it will take some
experimentation to figure this out. If anyone has experiences with this, then
I'd be interested to hear about it.
Greetings,
Hans
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