RESIZE_FFS(8) | System Manager's Manual | RESIZE_FFS(8) |
resize_ffs
—
resize_ffs |
[-cpvy ] [-s
size] special |
resize_ffs
resizes a file system.
special is the name of the raw disk device or file where
the file system resides. resize_ffs
can both grow and
shrink file systems. When growing, the disk device must of course be large
enough to contain the new file system; resize_ffs
simply extends the file system data structures into the new space. When
shrinking, resize_ffs
assumes this.
resize_ffs
has to copy anything that currently resides
in the space being shrunk away; there must be enough space free on the file
system for this to succeed. If there is not,
resize_ffs
will complain and exit; when this happens,
it attempts to always leave the file system in a consistent state, but it is
probably a good idea to check the file system with
fsck(8).
If no -s
option is provided,
resize_ffs
will grow the file system to the
underlying device size which is determined from
special.
The options are as follows:
-c
-p
-s
-v
-y
resize_ffs
.resize_ffs
may leave your file system in an inconsistent state and require
a restore from backup. It attempts to write in the
proper order to avoid problems, but as it is still considered experimental,
you should take great care when using it.
When resize_ffs
is applied to a consistent
file system, it should always produce a consistent file system; if the file
system is not consistent to start with, resize_ffs
may misbehave, anything from dumping core to completely curdling the data.
It is probably wise to fsck(8)
the file system before and after, just to be safe. You should be aware that
just because fsck(8) is happy
with the file system does not mean it is intact.
resize_ffs
exits with 0 on success. Any major problems
will cause resize_ffs
to exit with the non-zero
exit(3) codes, so as to alert any
invoking program or script that human intervention is required.
resize_ffs
/dev/vg00/rlv1
will enlarge the file system on the Logical Volume /dev/vg00/lv1 from Volume Group vg00 to the current device size.
resize_ffs
command first appeared in
NetBSD 2.0.
A big bug-finding kudos goes to John Kohl for finding a significant rotational layout bug.
Has no intelligence whatever when it comes to allocating blocks to copy data into when shrinking.
Does not currently support shrinking FFSv2 file systems.
October 1, 2017 | NetBSD 9.4 |