HP-UX Reference (11i v1 00/12) - 4 File Formats (vol 8)
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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man4/!!!intro.4
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a
arraytab(4) arraytab(4)
Bit 3 off Not used.
Bit 4 on Asynchronous Event Notification polling enable.
Bit 5 on Parity verification enable.
Bit 6 on Write with parity verification enable.
Bit 7 off Not used.
Bit 8 off Mode Sense: Current. Current values are accessed during mode sense.
This bit should not be set concurrently with Bit 9.
Bit 9 off Mode Sense: Saved. Saved values are accessed during mode sense. This
bit should not be set concurrently with Bit 10.
Bit 10-15 off Not used.
RAID LEVEL RESTRICTIONS:
The following restrictions apply to RAID configurations for the array:
RAID_0:
• No disk list may contain more than 1 disk per channel
• For groups larger than 5 disks, additional lists are defined and data is accessed in the order of
definition.
RAID_1:
In this mode the lists define the set of disks for data, and the set of disks which form the mirrored
pair.
• Two lists must be specified.
• The two lists must be of equal length.
• No list may contain more than 1 disk per channel
• Corresponding entries in the two lists (these form a mirrored disk pair) cannot be on the
same channel.
RAID_3:
• There must be an odd number of disks in the disk list.
• Disks in the disk list must be on separate channels.
• The first disk of the set must be on channel 1, followed in order by the other channels. Thus
a 3 disk set will use channels 1 through 3.
• The disk on the last channel is the parity disk. (Channel 3 for 3 disk configuration, channel 5
for 5 disk configuration.)
• Maximum configuration is 1 list of 5 disks.
RAID_5:
• The disk list cannot contain more than 1 disk per channel.
• Maximum configuration is 1 list of 5 disks.
EXAMPLE:
PGroup1: dl#0: d0#1#0#HP_02425: d1#2#0#HP_02425: d2#3#0#HP_02425:
LConfig: lp#0: gs#3: gn#PGroup1: r#RAID_3: is#0: ss#8192:\
cv#204994: ct#HP_C2425D
lp#1: gs#3: gn#PGroup1: r#RAID_3: is#0: ss#8192:\
cv#8192: ct:#HP_C2425D
FILE SYSTEM CONSIDERATIONS:
The performance of the disk array will depend heavily upon the RAID level used, and the application. In
addition, the disk array configuration parameters should be chosen with consideration of the parameters
used for the file system in use on the array.
WARNING:
The configurations found in /etc/hpC2400/arraytab
have been chosen and certified by HP for
proper operation on HP systems. Use of configurations other than these have NOT been certified for
proper operation, and cannot be warranted.
Section 4−−24 − 4 − HP-UX Release 11i: December 2000
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