HP XP External Storage Software User Guide (T1706-96018, November 2011)
Table 4 When external LU's emulation type is for mainframes
HDD typeApplication
SATAFC
Not RecommendedNot RecommendedDatabase
Online
Transaction
Processing
(OLTP)
Not RecommendedNot RecommendedSystem volumes
(Journal, Check
points)
Not SupportedNot SupportedOperation from
TPF
Not RecommendedOKFile operation
from host
(both Read and
Write)
OKOKFile operation
from host
(mainly Read)
RecommendedOKBackup
RecommendedOKArchive
• 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 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 concern, ensure that the external LU's Path Blockade Watch time is
the same as or shorter than the host command's time-out period.
Combining XP External Storage with other HP products
You can use HP software products to operate and manage the external LUs you set using XP External
Storage.
Combining XP External Storage with other HP products 37