HP StorageWorks XP10000 - Disk Array Manuel de configuration - Page 16

Setting the disk and device parameters

The queue depth parameter (max_throttle) for the devices must be set according to one of the options

specified in

Table

Table 3 Max throttle (queue depth) requirements for the devices

Queue depth op-

tion

Option 1

Option 2 (preferred)

NOTE:

You can adjust the queue depth for the devices later as needed (within the specified range) to optimize

the I/O performance.

The required I/O time-out value (TOV) for devices is 60 seconds (default TOV=60). If the I/O TOV

has been changed from the default, change it back to 60 seconds by editing the sd_io_time or

ssd_io_time parameter in the /etc/system file.

You may also need to set several other parameters (such as FC fibre support). See the user

documentation that came with your FCA to determine whether other options are necessary to meet

your operational requirements.

NOTE:

Use the same settings and device parameters for all systems. For Fibre Channel, the settings in the

system file apply to the entire system, not to just the FCAs.

To set the I/O TOV and queue depth for the devices:

Make a backup of the /etc/system file: cp /etc/system /etc/system.old.

Installing and configuring Solaris for the XP family of disk arrays

Requirements

XP10000, XP12000, SVS 200: Queue_depth

XP20000, XP24000: Queue_depth

CAUTION:

The number of issued commands must be completely controlled. Because queuing

capacity of the disk array is either 1024 or 2048 per port (depending on the disk

array), you must adjust the number of issued commands from Solaris system to

less than 1024 or 2048. Otherwise, memory allocate failed messages may occur

on the Solaris system, and all read/write I/O may stop, causing the system to

hang.

XP10000, XP12000, SVS 200: Number of LUs x queue_depth

queue_depth

XP20000, XP24000: Number of LUs x queue_depth

1024 default.

2048 default.

2048 and queue_depth

1024 and