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0 pointsBSDobelix1y ago0 comments

So a year ago i tried to repeat my old trick damaging btrfs (as a user NOT root). Fill the volume with dd if=/dev/urandom of=./file bs=2M && sync && rm ./file then reboot the machine and yes it still works, it's not booting anymore, bravo.

BTW: Even SLES SuseLinux Enterprise says use XFS for data btrfs just for the OS i wonder why

0 comments

PlutoIsAPlanet1y ago

> BTW: Even SLES SuseLinux Enterprise says use XFS for data btrfs just for the OS i wonder why

Because XFS is far quicker for server-related software such as databases and virtual machines, which are weak points on btrfs due to its COW model.

josephcsible1y ago

Doesn't "chattr +C" give you back that performance, while still letting you keep the rest of the benefits of Btrfs?

curt151y ago

Nodatacow is an ugly hack because it disables btrfs's core features for the affected data. It also should not be used with raid1.

BSDobelixOP1y ago

Yeah and maybe additionally you want to keep your data and have a stable filesystem for them ;)

yjftsjthsd-h1y ago

> So a year ago i tried to repeat my old trick damaging btrfs (as a user NOT root). Fill the volume with dd if=/dev/urandom of=./file bs=2M && sync && rm ./file then reboot the machine and yes it still works, it's not booting anymore, bravo.

Do you know how ZFS handles that?

BSDobelixOP1y ago

Without any problems. No other Filesystem i tested has that problem (ext4, XFS, ZFS, NTFS, JFS, Nilfs2)

yjftsjthsd-h1y ago

Good to hear:) My understanding is that it's easier to break a CoW filesystem like that because if you run out of space you can't even delete things (because that requires writing that change), so I'm not surprised that the rest (the non-CoW filesystems) did fine, but I'm happy to hear that ZFS also handles it.

j / k navigate · click thread line to collapse

0 pointsBSDobelix1y ago0 comments

BTW: Even SLES SuseLinux Enterprise says use XFS for data btrfs just for the OS i wonder why

0 comments

PlutoIsAPlanet1y ago

> BTW: Even SLES SuseLinux Enterprise says use XFS for data btrfs just for the OS i wonder why

Because XFS is far quicker for server-related software such as databases and virtual machines, which are weak points on btrfs due to its COW model.

josephcsible1y ago

Doesn't "chattr +C" give you back that performance, while still letting you keep the rest of the benefits of Btrfs?

curt151y ago

Nodatacow is an ugly hack because it disables btrfs's core features for the affected data. It also should not be used with raid1.

BSDobelixOP1y ago

Yeah and maybe additionally you want to keep your data and have a stable filesystem for them ;)

yjftsjthsd-h1y ago

Do you know how ZFS handles that?

BSDobelixOP1y ago

Without any problems. No other Filesystem i tested has that problem (ext4, XFS, ZFS, NTFS, JFS, Nilfs2)

yjftsjthsd-h1y ago

j / k navigate · click thread line to collapse