16-6 Dell PowerVault 720N, 740N, and 760N System Administrator and Command Reference Guide
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Quotas are always disabled on a mirror, regardless of whether quotas are enabled on
the source volume. If you try to enable quotas on a mirror, the filer generates an error
message.

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After you convert a mirror to a regular volume, you can enable quotas on it.
However, if the former mirror and the source volume reside on different filers, they
might be under the effect of different quota restrictions because there is one
/etc/
quotas file for each filer. If you want the same quota restrictions to be applied on both
volumes, make sure that the filer on which the former mirror resides has a
/etc/quotas
file containing all entries from the /etc/quotas file used by the source volume.
Refer to Converting a Mirror to a Regular Volume for information about changing
the status of a mirror.
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If you want to back up data from a mirror, the data must be in an existing snapshot,
not the active file system, on the mirror. This is because before the dump command
writes data from an active file system to tape, the filer must create a snapshot in the
volume containing the data. The filer cannot create snapshots on the mirror, which is
a read-only volume, to be used by the dump command.
You can back up any snapshot displayed by the snap list command on the mirror.
You can also create a snapshot on the source volume, replicate the snapshot to the
mirror, and use the dump command to back up this snapshot from the mirror to tape.

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Running the dump command on a mirror might change the mirror update schedule in
the following ways:
If the mirror is scheduled to be updated when a dump command is in progress on
the mirror, the filer delays replicating data from the source volume until the
dump
command is finished.