Table 4 when external lu’s emulation type is open, 4 when external lu’s emulation type is open – HP StorageWorks XP Remote Web Console Software User Manual
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Preparing for External Storage XP operations
• Table 4
show the recommended application level for the mapped external LU according
to the external LU’s HDD type.
•
The external array’s performance and status affect the mapped external LU’s Read and Write
performance. If there is a heavy load on the external array, the Read and Write operation’s processing
speed slows. In this case, I/Os from the mainframe host might have an MIH error.
•
If the host connected to the local array issues too many I/Os for the external array to process,
commands from the host might time out.
When the amount of I/Os from the host to the external LU exceeds the maximum amount of I/Os the
external array can accept, commands from the host to the local array might time out. As you configure
the system using external LUs, consider the external array’s I/O capacity.
•
When executing commands in HP StorageWorks software products to the mapped external LU and,
therefore, too many I/Os are issued for the external array to process, commands might time out and
errors might occur.
When the amount of I/Os from the software products to the external LU exceeds the maximum amount
of I/Os the external array can accept, commands might time out and errors might occur. As you
configure the system using external LUs, consider the external array’s I/O capacity.
•
When using an external LU from the host, note the external LU’s Path Blockade Watch time. If the Path
Blockade Watch time is longer than the host command’s timeout period, commands from the host might
time out when the power supply is off or errors occur for the external array. If host I/O is a significant
Table 4
When external LU’s emulation type is OPEN
Application
HDD type
FC
S-ATA
Database
Online Transaction Processing (OLTP)
Not Recommended
Not Recommended
File operation from host
(both Read and Write)
OK
Not Recommended
File operation from host
(mainly Read)
OK
OK
Backup
OK
Recommended
Archive
OK
Recommended
Table 5
When external LU’s emulation type is for mainframes
Application
HDD type
FC
S-ATA
Database
Online Transaction Processing (OLTP)
Not Recommended
Not Recommended
System volumes
(Journal, Check points)
Not Recommended
Not Recommended
Operation from TPF
Not Supported
Not Supported
File operation from host
(both Read and Write)
OK
Not Recommended
File operation from host
(mainly Read)
OK
OK
Backup
OK
Recommended
Archive
OK
Recommended