Overland Storage SnapServer Administrator's Manual page 95

SnapServer 7.0 Administrator's Guide
To Rename a Volume
On the Volume Properties page, enter the new name starting with an alphanumeric
character and using up to 20 alphanumeric characters or hyphens (but not spaces). Then
click OK.
To Expand Volume Capacity
A volume's capacity can be expanded by navigating to the Storage > Volumes page and
clicking the name of a volume. There are two ways to expand the size of a volume:
• Adding Unallocated Capacity – If there is unallocated capacity remaining on the
RAID, you can add this capacity to the volume by either (1) editing the Volume size
field to a size less than or equal to the maximum size of the volume, or (2) clicking the
Grow to Max. Size button and then clicking OK.
NOTE: You cannot decrease the size of an existing volume. You can, however, delete the
• Creating a New RAID Set – If all capacity on the existing RAID set is allocated, and
either (1) a sufficient number of drives to create a new RAID set exists, or (2) a RAID
set of the same type with excess capacity exists, then the Expand Volume button
appears. Click this button to create an additional RAID set, group the new RAID set
with the existing RAID, and then expand the volume into the space on the new RAID
group.
NOTE: If you expand the volume onto an existing RAID set with existing volumes, those
To Configure Write Caching
NOTE: This is not related to write caching on iSCSI disks. For information about configuring write
By default, write cache is enabled on all volumes. For systems that do not use a UPS device
to help protect data during a power outage, or for applications that require synchronous
writes to disk, write cache can be disabled on a volume-by-volume basis. When a volume's
write cache is disabled, all data written to the volume bypasses memory buffers and writes
directly to disk, helping to protect the data when writes are occurring during a power
outage. While disabling write cache does help protect data, it also significantly impacts disk
write performance.
Important considerations about write cache:
• When write cache is disabled on a volume, disk cache is also disabled on all disk
drives that are members of the RAID or RAID group hosting the volume. This can
impact performance on other volumes with write cache enabled that are hosted by the
same RAID or RAID group.
• Not all disk drives support disabling write cache. If any of the volume's drives are IDE
drives, you will not have the option to disable write cache for that volume.
10400317-001 10/2011
volume and recreate it as a smaller size.
volumes will be preserved and the expanded volume will only consume the free space
on the RAID set.
caching on iSCSI disks, see
©2010-11 Overland Storage, Inc.
"Write Cache Options with iSCSI Disks" on page
5 – Traditional RAID Storage
6-18.
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