HP LH4r HP Netserver LH Pro NetRAID Installation Guide - Page 47

Setting Up RAID 5 Arrays on an HP NetServer Cluster

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Appendix C RAID Array Configuration 1. Click Next. The Configuration Wizard displays its Logical Drive Definition window. 2. The Logical Drive Definition window shows the array's RAID level (RAID 1) and its usable size. Notice that the size of the array is one half of the sum of the capacity of the two drives composing the array, since all data is duplicated. 3. Click Advanced and verify that Write Policy is set to "Write Thru" and then click OK. 4. Click Accept to set the array parameters. 5. If you: • want to define another array, click Back and repeat the steps listed above starting with step 3 in Define Array. • have identified all your arrays, click Next, Finish, and then OK. NetRAID Assistant saves the array configuration and prompts that the array configuration has changed. Click OK. Initialize the Array After you have defined the cluster's arrays, you need to initialize the arrays you defined. HP NetRAID Assistant initializes all arrays you have defined at the same time. To initialize all the arrays: 1. At the "Would you like to Initialize?" prompt, click OK. HP NetRAID Initialization may be time consuming. Plan on 5 to 15 minutes per array. 2. When NetRAID initialization is complete, exit NetRAID Assistant. 3. Continue configuration using Windows NT Disk Administrator. When you have finished defining and configuring the cluster's arrays using HP NetRAID Assistant, return to Part 5 and finish array configuration using the Windows NT Disk Administrator utility. Setting Up RAID 5 Arrays on an HP NetServer Cluster The HP NetRAID adapter and proprietary HP NetRAID software can be used to organize the cluster's disk storage into RAID level 5 disk arrays. Each level 5 RAID array is composed of three hard (hot swap) drives located in external shared storage cabinets. RAID level 5 (striping with distributed parity) provides storage redundancy with good overall performance and a minimum loss in storage capacity. With RAID 5 the equivalent of only one hard drive in the array is used for redundancy. Note that each array supporting RAID 5 logical disks requires at least three physical drives. Raid Level 5 Parity Distribution Stripe Disk 1 Disk 2 Disk 3 1 Block 1.1 Block 1.2 Parity 1 HP NetServer LH Pro Microsoft Cluster Installation Guide - 1 October 1997 38

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Appendix C
RAID Array Configuration
HP NetServer LH Pro Microsoft Cluster Installation Guide - 1 October 1997
38
1.
Click Next.
The Configuration Wizard displays its Logical Drive Definition window.
2.
The Logical Drive Definition window shows the array’s RAID level (RAID 1) and its usable size.
Notice that the size of the array is one half of the sum of the capacity of the two drives composing the
array, since all data is duplicated.
3.
Click Advanced and verify that Write Policy is set to "Write Thru" and then click OK.
4.
Click Accept to set the array parameters.
5.
If you:
•
want to define another array, click Back and repeat the steps
listed above starting with step 3 in Define Array.
•
have identified all your arrays, click Next, Finish, and then
OK.
NetRAID Assistant saves the array configuration and prompts
that the array configuration has changed. Click OK.
Initialize the Array
After you have defined the cluster’s arrays, you need to initialize the arrays you defined. HP NetRAID Assistant
initializes all arrays you have defined at the same time. To initialize all the arrays:
1.
At the "Would you like to Initialize?" prompt, click OK.
HP NetRAID Initialization may be time consuming. Plan on 5 to 15 minutes per array.
2.
When NetRAID initialization is complete, exit NetRAID Assistant.
3.
Continue configuration using Windows NT Disk Administrator.
When you have finished defining and configuring the cluster’s arrays using HP NetRAID Assistant, return to Part 5
and finish array configuration using the Windows NT Disk Administrator utility.
Setting Up RAID 5 Arrays on an HP NetServer Cluster
The HP NetRAID adapter and proprietary HP NetRAID software can be used to organize the cluster’s disk storage
into RAID level 5 disk arrays. Each level 5 RAID array is composed of three hard (hot swap) drives located in
external shared storage cabinets.
RAID level 5 (striping with distributed parity) provides storage redundancy with good overall performance and a
minimum loss in storage capacity. With RAID 5 the equivalent of only one hard drive in the array is used for
redundancy. Note that each array supporting RAID 5 logical disks requires at least three physical drives.
Raid Level 5 Parity Distribution
Stripe
Disk 1
Disk 2
Disk 3
1
Block 1.1
Block 1.2
Parity 1