Dell PowerVault 720N, Справочник по командам, Страница: 268 / 606

9-16 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
$FFHVVLQJ6QDSVKRWV)URP&OLHQWV
$ERXW&OLHQW$FFHVVWR6QDSVKRWV
Snapshots can be accessed by any user with the appropriate permissions. Every
directory in the filer’s active file system contains a directory named .
snapshot
,
through which users can access old versions of files in that directory. How users gain
access to snapshots depends on the file-sharing protocol used: NFS or CIFS.
1)6&OLHQW$FFHVVWR6QDSVKRWV
Figure 9-3 shows the directory structure on a client with the
vol0
volume of a filer
named filer mounted on
/n/filer
.
)LJXUH'LUHFWRU\6WUXFWXUHRI1)6&OLHQW$FFHVVWR6QDSVKRWV
([SODQDWLRQ
In this example, the client can obtain access to snapshots by way of
/n/filer/.snap-
shot
. This might seem to contradict the explanation of snapshot access in the
preceding section, because it shows a
.snapshot
directory only at the mount point
instead of in every directory in the tree.
Actually, the
.snapshot
directory in the mount point is “real” to make the
pwd
com-
mand work, whereas the
.snapshot
directories in all other directories are “magic”;
that is, can be accessed when they are referenced by name but do not show up in a
directory listing.
n
files in the vol0
volume on the filer
.snapshot directory
nightly.0 directory
files in the vol0 volume
on the filer as of the
previous midnight
files in the
vol0 volume
on the filer as of the
midnight before last
nightly.1 directory
toaster
etc usr var
/