On 16/05/15 18:10, Bjarne Saltbaek wrote:
Hi Mark and people.

Freedom of choice! :) I have nothing against ZFS, I myself have been
using default choices by Redhat/CentOS in the various distributions at
home and at work meaning ext3 and ext4 with LVM. So maybe some easy wiki
guidelines on how to easy switch between the technologies and pro's and
con's like the ones you and Gordan mention.

Unfortunately, switching can be quite involved and requires setting up a pool, copying the entire rootfs over, modifying the initramfs to include all of the zfs requirements, and getting it to work.

There are howtos for how to do this with ZoL on x86 grub systems. On ARM it will be that much more unstandardised because of the range of kernels and boot loaters, but the basic gist of it would be similar.

Like, I would love to see /var/run moved moved to a tempfs like
Raspberry suggests if you run on a SD/MicroSD.

I provided a reference implementation for just this sort of thing:

https://bugzilla.redhat.com/show_bug.cgi?id=223722

6 years ago.

But, PNAELV have decided they can't be bothered, as they often do. With things like this the approach is often to leave the ticket to rot until they change something in bleeding edge Fedora that makes it non-applicable (or at least not applicable in the same form).

By all means, use my proposed patches in the ticket above if what you described is an important requirement for you.

The alternative is modifying all init scripts to ensure that they create any required subdirectories before they put anything in the directory tree in question. That could be a LOT of packages to modify. You'd also want to make sure the directories in /var/run/ are not created by the rpm package but are all dynamically created by the init script. That would probably be a better long term solution, but what I proposed in the above ticket is a much smaller change and pretty generic.

Gordan
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