[Libguestfs] Intent to retire: zerofree

[Reindl Harald]

Am 18.02.2018 um 19:53 schrieb Richard W.M. Jones:
> 
> zerofree is a package that can take an ext2 (only?) filesystem, work
> out what parts of the filesystem are not used, and either zero them or
> sparsify them.
> 
> This was useful in about 2009 when I added it to Fedora.  However
> nowadays it's more convenient to use the equivalent kernel
> functionality (via the ‘fstrim’ command or equivalent ioctls).  The
> kernel functionality also works correctly for other filesystem types.
> 
> There's also a more serious data safety issue: Although this probably
> works OK for ext2 since that format is frozen in time, it probably
> corrupts ext4 filesystems containing features that it doesn't know
> about.
> 
> It is for these reasons that I don't think you should use this package
> and I intend to retire it unless anyone says otherwise

fstrim don't work on VMware guests stored on NFS
fstrim don't work on VMware guests on VMFS lower than 6.0
fstrim don't work on Proxmox with SATA vritual adapters

so back to the good old:
nice -n 19 dd status=progress if=/dev/zero bs=64M of=zero.fill bs=64M
sync
nice -n 19 rm -f zero.fill