System And Performance Expectations; Raid Levels - HP P6300 Enterprise Virtual Array Installation Manual

5. Enable CHAP for the Microsoft iSCSI initiator running on the iSCSI server:
a. Click the General tab.
b. Click Secret in the middle of the screen.
c. Click Reset.
d. Enter the iSCSI or iSCSI/FCoE presented target CHAP secret. For example: hpstorageworks
e. Click OK.
f. Click the Discovery tab and when manually discovering iSCSI target portals:
i.
ii.
iii. Click Advanced.
iv. Select the CHAP Login Information check box.
v.
vi. Select the Mutual Authentication check box.
vii. Click OK twice and the initiator completes target discovery.
g. Click Targets and select the appropriate target for login.
h. Click Log On and then click Advanced.
i. Select the CHAP Login Information check box.
j. Enter the CHAP secret for the discovered iSCSI initiator of the iSCSI or iSCSI/FCoE
modules in the Target Secret box. For example, CHAPsecret01.
k. Select the Mutual Authentication check box.
l. Click OK twice, and the initiator completes normal login.

System and performance expectations

To help determine the best way to configure your storage, rank the following three storage
characteristics in order of importance:
Fault tolerance (high availability)
I/O performance
Storage efficiency
With your priorities established, you can determine which striping method and RAID level to use.
As highlighted in the following section, some configuration methods offer greater fault tolerance,
while other configuration methods offer better I/O performance or storage efficiency.

RAID levels

Vraid is the HP term for the implementation of RAID (Redundant Array of Independent Disks) storage
on EVAs. Vraid is also referred to as redundancy in HP management software. Virtual disks with
HP Vraid use three key RAID methods: data striping, data mirroring, and parity error checking.
Unlike traditional RAID, all HP Vraid levels distribute data across all available physical disks.
Data striping improves speed by performing virtual disk I/O with an entire group of physical disks
at the same time. Mirroring provides data redundancy by storing data and a copy of the data.
Parity also provides data redundancy by storing data and the calculated parity for each stripe of
data. If a subset of the data on a physical disk becomes corrupt or the entire physical disk fails,
the data can be automatically recovered from redundancy so that data loss does not occur.
The EVA has four Vraid types: Vraid0, Vraid1, Vraid5, and Vraid6. Each Vraid type provides
unique I/O speed and has a different level of data redundancy, which directly effects the amount
of physical space used. Once a virtual disk is created, the Vraid type or level cannot be changed.
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Click Add under Target Portals.
Enter the IP address of the iSCSI port of the 1 GbE iSCSI modules or the 10GbE
iSCSI/FCoE modules.
Enter the CHAP secret for the 1 GbE iSCSI modules or the 10GbE iSCSI/FCoE
modules discovered iSCSI initiator in the Target Secret box. For example,
CHAPsecret01.
Plan your storage configuration 17