Storage resource management issues
If you have more than one size of disk installed in your storage system, if you
have configured quotas or if you use FlexCache volumes you should
familiarize yourself with these storage resource management issues.
For more information about these issues, see the Data ONTAP 8.0 7-Mode
Storage Management Guide.
v “Writes to a LUN fail when the combined size of the LUN and the change
log is greater than the volume size”
v “Configuring user mapping for a default user quota with CIFS licensed but
not configured could severely degrade performance”
v “After changing the port assigned to ACP, a reboot is required to regain use
of the original port”
v “Moving disks to a system running an earlier version of Data ONTAP could
cause disk identification issues”
v “Data ONTAP can silently select varying disk sizes or array LUN sizes
when creating an aggregate” on page 92
– “Adding disks when varying sized disks are in use” on page 92
– “Discovering what disks Data ONTAP will automatically select” on page
93
v “SSD Spare blocks consumed limit reported as N/A” on page 93
Writes to a LUN fail when the combined size of the LUN and the change
log is greater than the volume size
If the size of a LUN and the size of the change log when combined together is
greater than the volume itself, then subsequent writes to the LUN might fail
due to insufficient free space in the volume.
Configuring user mapping for a default user quota with CIFS licensed but
not configured could severely degrade performance
If you configure user mapping for a default user quota on a storage system
for which CIFS is licensed but not configured, a later attempt to delete a qtree
could result in significantly degraded performance. If you license CIFS, you
must also configure it completely to avoid this issue.
After changing the port assigned to ACP, a reboot is required to regain
use of the original port
If you reconfigure ACP to use a new port, the port that was configured for
ACP before becomes available for use by another subsystem only after you
reboot the storage system.
Moving disks to a system running an earlier version of Data ONTAP could
cause disk identification issues
If you remove a disk from a storage system running Data ONTAP 7.3 or later
and place it into a storage system running an earlier version of Data ONTAP,
Known problems and limitations 91
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