03-07-2017
Quote:
Originally Posted by
gull04
I can't really understand the logic of a single disk in a zpool, as there are no data replicas available that allow the benefits of zfs - you might as well use UFS at least you have more recovery tools.
A single disk pool is a poor practice, but unfortunately widespread when storage arrays are used. ZFS is still beneficial when using a single disk pool though.
- There is double or triple redundancy in the metadata, that makes the file system resilient to moderate disk corruption.
- You can also enable ditto blocks (copies) so data itself would recover from some disk blocks issues.
- ZFS will immediately spot corrupted data or metadata while UFS will return corrupted data without notice and might panic the OS if metadata is corrupted.
- Finally, telling you have more UFS recovering tools is questionable. With ZFS, you can recover from situations where UFS would be helpless.
This User Gave Thanks to jlliagre For This Post:
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LEARN ABOUT FREEBSD
zfsloader
ZFSLOADER(8) BSD System Manager's Manual ZFSLOADER(8)
NAME
zfsloader -- kernel bootstrapping final stage
DESCRIPTION
zfsloader is an extended variant of loader(8) with added support for booting from ZFS. This document describes only differences from
loader(8).
ZFS FEATURES
zfsloader supports the following format for specifying ZFS filesystems which can be used wherever loader(8) refers to a device specification:
zfs:pool/filesystem:
where pool/filesystem is a ZFS filesystem name as described in zfs(8).
If /etc/fstab does not have an entry for the root filesystem and vfs.root.mountfrom is not set, but currdev refers to a ZFS filesystem, then
zfsloader will instruct kernel to use that filesystem as the root filesystem.
ZFS COMMAND EXTENSIONS
lsdev [-v]
Lists ZFS pools in addition to disks and partitions. Adding -v shows more ZFS pool details in a format that resembles zpool status
output.
lszfs filesystem
A ZFS extended command that can be used to explore the ZFS filesystem hierarchy in a pool. Lists the immediate children of the
filesystem. The filesystem hierarchy is rooted at a filesystem with the same name as the pool.
FILES
/boot/zfsloader zfsloader itself.
EXAMPLES
Set the default device used for loading a kernel from a ZFS filesystem:
set currdev=zfs:tank/ROOT/knowngood:
SEE ALSO
gptzfsboot(8), loader(8), zfs(8), zfsboot(8), zfsloader(8), zpool(8)
HISTORY
The zfsloader first appeared in FreeBSD 7.3.
AUTHORS
This manual page was written by Andriy Gapon <avg@FreeBSD.org>.
BSD
September 15, 2014 BSD