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xStack Storage User’s Guide 55
5.3.2 Deleting User Accounts
If you no longer need a user account, use the following procedure to delete it.
1. On the View menu, click User Accounts . The User Accounts screen appears, with a list of the
user accounts that have been defined.
2. Click the user whose account you want to delete, then click the Delete User button.
5.4 Managing the xStack Storage Array
This section shows you how to configure and manage storage on the xStack Storage Array.
5.4.1 Working with Volumes
A volume is a set of storage blocks organized and presented for use by a customer’s server (an
iSCSI initiator node). Each volume must be associated with a storage pool, which limits the drives
that can be used to hold data for that Volume (only drives in that pool can be used for this
volume). Only the Blade A Base Pool can be used for volumes.
The iSCSI initiator node sees the volume as a contiguous series of numbered blocks, called Virtual
Logical Block Numbers (VLBNs), in the same way that it would see the storage space on a single
disk drive. The xStack Storage Array builds a volume from extents. A volume typically consists of
extents from several drives.
Volume can be organized in several ways (see Table 5-2).
Table 5-2 Ways to Organize Volumes
Organization Definition Redundant Striped Equivalent
to RAID
Level
JBOD One copy of the data is written to the selected Extents. No No -
Mirror Two copies of all data are written to independent Extents. Yes No RAID 1
Stripe Distributes one copy of the data among several drives to
improve the speed of access. No Yes RAID 0
Mirrored Stripe Distributes the data among several drives and then keeps a
mirror copy of the blocks on each drive Yes Yes RAID 1+ 0
Parity
Distributes one copy of the data among several drives and adds
parity blocks spread throughout the volume to protect against
the loss of any single drive.
Yes Yes RAID 5