PowerMax and VMAX All Flash: Customer reports slow mainframe performance right after a code load
Summary: Customer reports mainframe slow after code load. They might also see IOS080I D204,A7,ICJED744, I/O TIMEOUT INTERVAL HAS BEEN EXCEEDED FOR AN ACTIVE REQUEST messages on the system console. ...
This article applies to
This article does not apply to
This article is not tied to any specific product.
Not all product versions are identified in this article.
Symptoms
Elongated response times after code load
SRDF/A and STAR with R11 configuration
Fix 106554 loaded.
Cause
During an SRDF/A cycle switch, the Ficon directors set a Short-Long Busy condition to the channel. This informs the mainframe to not use the device during the cycle switch. Once the cycle switch completes, a State Change Interrupt (SCI) is sent to the channel to remove the long busy status. Then the mainframe can continue accessing the device.
During SCI processing, the message bus is used to transport the message to release long busy. It is during this message bus processing that it is getting delayed. When it exceeds a 300-500 millisecond timeout, specific internal errors are posted to reflect this. This issue is due to a missing update to the SCI processing over the Message Bus processing resulting in the problem.
This code issue only occurs when enhancement 106554 is loaded.
During SCI processing, the message bus is used to transport the message to release long busy. It is during this message bus processing that it is getting delayed. When it exceeds a 300-500 millisecond timeout, specific internal errors are posted to reflect this. This issue is due to a missing update to the SCI processing over the Message Bus processing resulting in the problem.
This code issue only occurs when enhancement 106554 is loaded.
Resolution
If you believe you have encountered this issue, contact the Support Center for assistance and quote this article ID.
Enhancement 110357 addresses this SCI processing issue. Another option is to get a new E-Pack which removes 106554.
Workaround:
Place the R21 to R22 SRDF/A leg in Adaptive Copy Disk.
Enhancement 110357 addresses this SCI processing issue. Another option is to get a new E-Pack which removes 106554.
Workaround:
Place the R21 to R22 SRDF/A leg in Adaptive Copy Disk.
Affected Products
PowerMax, PowerMaxOS 5978, SRDF/Asynchronous, VMAX All FlashArticle Properties
Article Number: 000190315
Article Type: Solution
Last Modified: 11 Jan 2023
Version: 6
Find answers to your questions from other Dell users
Support Services
Check if your device is covered by Support Services.