Dell PowerVault 720N, Command Reference Manual, Page: 336 / 606

15-4 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
NOTE: The
vol offline
command takes effect only after you reboot the filer.
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The capacity of the destination volume must be greater than or equal to the capacity
of the source volume, regardless of how many snapshots you try to copy. To verify
the capacity of a volume, follow these steps:
1. Enter the following command syntax:
df /vol/
volume_name
The command displays information about disk space in the active file system and
in the snapshot for the specified volume.
2. Add the numbers in the kbytes column in the
df
output. The result is the number
of kilobytes of data that the volume can hold.
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If the destination volume is not a new volume, make sure that the destination volume
does not contain data that you might need in the future. This is because after the filer
starts copying the source volume, it overwrites the entire destination volume. That is,
all data in the active file system and in the snapshot of the destination volume is lost
after the filer starts copying the data.
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If the source and destination volumes in a volume copy operation reside on two filers,
the filers must have a trusting relationship with each other. That is, you must specify
each filer as a trusted host in the
/etc/hosts.equiv
file of the other filer. The
/etc/
hosts.equiv file contains a list of host names, each of which is on a separate line.
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If you want to copy data between volumes on the same filer, you must specify local-
host on the filer as a trusted host in the filer’s
/etc/hosts.equiv
file. Localhost is the
interface through which the filer sends packets to itself.
If you have not already listed localhost as a trusted host, follow these steps to include
localhost in
/etc/hosts.equiv
:
1. Enter the loopback address, which is 127.0.0.1, in the
/etc/hosts
file.
2. Type
localhost
on a separate line in the
/etc/hosts.equiv
file.
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To avoid performance problems when copying to a different filer, you might want to
set up a private network for copying between the source and destination filers. This is
because when a filer copies data between two volumes, it floods the network with