Number of volumes per array
: This setting controls whether or not each RAID array will be further
divided into two or more smaller volumes. The default setting is
1
. The number of volumes per array
can be anywhere from
1
to
10
.
Limit volume size to less than 2TB
: This option is unchecked by default. If your hosts do not
support volumes of more than 2TB in size, check this option.
In the
Reserve for Snapshots (% of total volume capacity)
drop-down list, select the amount of
each volume’s total capacity that you wish to reserve for snapshots. The default setting is
25%
. You
can select
10%
,
25%
,
50%
, or
100%
. Enabling snapshots also enables replication.
Notes:
Selecting
Disabled
will cause the Quick Start operation to use all available space in the array for
volumes. To enable snapshots and replication later, you will need to delete at least one volume to
free up space for the snapshot reservation.
For detailed information regarding the snapshots and replication features, see the
Nexsan High-
Density Storage Snapshots and Replication User Guide
.
2. Using the drop-down lists, set the following parameters under
Advanced Options
:
Preferred stripe size
: The default stripe size is
128Kbytes
. You can choose to use smaller stripes
by selecting
64Kbytes
,
32Kbytes
, or
16Kbytes
.
Note
It is strongly recommended that you do not change this setting.
Select host connection type
: By default, this setting is set to
Fibre/10Ge/SAS (multi-path)
, which
maps all logical unit numbers (LUNs) to all available host ports. If you wish to change the mapping,
select one of the following:
None (leave unmapped)
: The LUNs will not be associated with any ports on the unit and will not
be available to the host. You can later manually assign each LUN to one or more ports using the
procedure under
Volume Configuration and Access
on page 36 or
Configure Volumes > Map
Volume
(see
Fibre/10Ge/SAS (non-redundant)
: Assigns each LUN to a single available FC/10GbE/SAS port.
Fibre/10Ge/SAS (multi-path)
: Assigns LUNs to all available FC/10GbE/SAS ports (requires
multipathing software).
iSCSI/1Ge (non-redundant)
: Assigns each LUN to a single available 1Ge iSCSI port.
iSCSI/1Ge (multi-path)
: Assigns LUNs to all available 1Ge iSCSI ports (requires multipathing
software).
Select default host access
: This setting defaults to
Deny
. This will prevent all attached hosts from
accessing any volumes on this unit. If you wish to allow host access to this unit, change this setting
to
Read
or
Read/Write
.
Note
To ensure integrity of data, it is recommended that you leave this setting as
Deny
, then use the
procedure under
Volume Configuration and Access
on page 36 to assign
Read
or
R/W
access to
specific hosts.
Online Create
: When this box is checked, volumes on this unit will be available immediately, with
RAID creation continuing in the background. This does, however, slow down the RAID creation
process. You can speed up the creation process by unchecking this box, in which case volumes will
be unavailable until RAID creation is complete.
Chapter 1: Basic Setup — Set up the system
Nexsan High-Density Storage
User Guide
34