IBM 86607SU Hardware Maintenance Manual - Page 126

Changing the RAID parameters, Advanced Functions, Enter., Stripe Unit Size, Attention

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8. Back up the disk-array configuration information to diskette. See "Backing up the disk-array configuration" on page 126 for instructions. Changing the RAID parameters: You can use the ServeRAID Configuration program to set the stripe-unit size, to set the rebuild priority, to turn Unattended Mode On or Off, or to turn Read Ahead On or Off. To change the RAID parameters: 1. Start the ServeRAID Configuration program (see "Starting the ServeRAID Configuration program" on page 77). 2. Select Advanced Functions from the Main Menu; then, press Enter. 3. Select Change RAID parameters from the next menu; then, press Enter. A screen similar to the following appears. IBM ServeRAID Adapter Disk Array Configuration Ver. X.XX Adapter Number: 1 Bus Number: 0 Host ID = Null Config Advanced Functions 1. Help 2. Backup IPS ServeRaid Config 3. Restore/Convert Saved Config 4. Logical Drive Params Management 5. Change RAID Parameters 6. IBM RAID Subsystem Diagnostic 7. Init/View/Synchronize Config 8. Display/Change Adapter Params Stripe Rebuild Unit Size Priority 8K High 1. 8K 2. 16K 3. 32K 4. 64K 1. Medium 2. High 3. Low Ch 1 Array Bay 1 ONL A 2 ONL A 3 ONL A 4 Ch 2 Array Bay 1 2 ONL B 3 4 5 6 7 8 Unatt9ended Mo1d0e Of1f1 5 ONL B 6 RDY 7 CDR 8 Rea9d Ahe1a0d 1O1n 1. On 12 1. O1n2 2. Off13 2. O1f3f 14 14 15 15 16 16 Select a choice using the Up Arrow, Down Arrow, Left Arrow and Right Arrow keys. Press Enter to change parameter. Press Esc to return to menu. Descriptions of the RAID parameters that you can change are as follows: Stripe Unit Size: The default setting is 8 K data bytes. The stripe-unit size is the amount of data written on a given disk before writing on the next disk. To maximize the overall performance, choose a size that is close to the size of the system I/O request. Note The size of the system I/O request depends on the operating system. If you are not sure of the size, use the default setting. Attention After you set a stripe-unit size and store data in the logical drives, you cannot change the size without destroying data in the logical drives. 118 Netfinity Server HMM

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8.
Back up the disk-array configuration information to
diskette.
See “Backing up the disk-array
configuration” on page
126 for instructions.
Changing the RAID parameters:
You can use the
ServeRAID Configuration program to set the stripe-unit
size, to set the rebuild priority, to turn Unattended Mode
On or Off, or to turn Read Ahead On or Off.
To change the RAID parameters:
1.
Start the ServeRAID Configuration program (see
“Starting the ServeRAID Configuration program” on
page 77).
2.
Select
Advanced Functions
from the Main Menu;
then, press
Enter.
3.
Select
Change RAID parameters
from the next
menu; then, press
Enter.
A screen similar to the following appears.
Bay
Array
Ch
1
Bay
Array
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Ch
2
ONL
RDY
CDR
B
B
ONL
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Select a choice using the Up Arrow, Down Arrow, Left Arrow and Right Arrow keys.
Press Enter to change parameter.
Press Esc to return to menu.
IBM ServeRAID Adapter Disk Array Configuration Ver. X.XX
Adapter Number: 1
Bus Number: 0
Host ID = Null Config
1. Help
2. Backup IPS ServeRaid Config
3. Restore/Convert Saved Config
4. Logical Drive Params Management
5. Change RAID Parameters
6. IBM RAID Subsystem Diagnostic
7. Init/View/Synchronize Config
8. Display/Change Adapter Params
1.
8K
2. 16K
3. 32K
4. 64K
1. Medium
2. High
3. Low
1. On
2. Off
1. On
2. Off
Advanced Functions
Stripe
Unit Size
8K
Rebuild
Priority
High
Unattended
Mode
Off
Read
Ahead
On
ONL
ONL
ONL
A
A
A
Descriptions of the RAID parameters that you can
change are as follows:
±
Stripe Unit Size:
The default setting is 8 K data
bytes.
The stripe-unit size is the amount of data written
on a given disk before writing on the next disk.
To maximize the overall performance, choose a
size that is close to the size of the system I/O
request.
Note
The size of the system I/O request depends
on the operating system.
If you are not sure
of the size, use the default setting.
Attention
After you set a stripe-unit size and store
data in the logical drives, you cannot change
the size without destroying data in the
logical drives.
118
Netfinity Server HMM