Well, since you brought it up...
That's something we discovered. Only z10 too, not any other z.
See my posts here ealier this year with low address exception in them.
In our case, a 4 vcpu 6G guest running java is affected. Seems to be somewhat
load related and definitely some apps are more susceptible than others.
Coincidentally, there is also a kernel bug with the exact same symptom. Both
RedHat and SuSE have fixes for that.
Here's the details in case anyone doesn't have access to resource link
-----------------------------------------------------------------------
RL: Hiper
Document Number: 060310
Machine Type: 2097, 2098
Models Affected: All Models
RETAIN TIP: H174493
ABSTRACT: HIPER MCLs have been released for machines at Driver 76 and
Driver 79
DESCRIPTION: HIPER MCLs have been released to address an issue reported in
the field. This issue has only been seen in the Linux on System z operating
system running as guest under zVM and has resulted in a Linux abend. This
issue occurred when the physical CPU transitioned from handling one guest
configuration to another. A very small window exists where the update of
the hardware controls related to multiprocessor address translation were
not handled properly. There are no methods to avoid exposure to this issue
other than installing the specified HIPER MCL's.
This problem has only been reported when running Linux on System z
as a guest under zVM. However, IBM believes it could also occur when
running other operating systems. Although an undetected data corruption has
never been reported as a result of this issue, there is a very small chance
that this could occur.
The following HIPER MCLs have been released to eliminate the exposure:
Driver 73 -- Driver-73 entered "End of MCL Support" August 2009 and a
fix for this issue will not be released for this Driver. Product
Engineering strongly recommends upgrading to Driver-79 to obtain this
fix.
Driver 76 -- MCL's N10967.101 and N10967.102 of the I390ML stream
released to RETAIN on June 1st, 2010 in MCL bundle #47.
Driver 79 -- MCL's N24406.032 and N24406.033 of the I390ML stream
released to RETAIN on June 1st, 2010 in MCL bundle #31.
RECOMMENDED ACTION: Product Engineering recommends the installation of
HIPER MCLs . These MCLs can be installed concurrent with system
operation.
Note- Driver-76 is currently in "Limited MCL Support" mode and will enter
"End of MCL Support" on June 30, 2010. Product Engineering strongly
recommends upgrading to Driver-79 during you next microcode maintenance
window. Driver-79 was released in November 2009 and is running on 40% of
the z10 machines in the field. Driver-79 is also the last planned driver
for z10.
EDM Considerations: The installation of these HIPER MCL's at Driver-76 will
exceed the current EDM min/max definition for concurrently upgrading to
Driver-79. A new EDM sync point is being developed and is targeted to be
released mid to late June, 2010. The following options are available:
1) Upgrade to Driver-79 and install the latest HIPER MCL's
2) Install the latest Driver-76 HIPER MCL's and wait for the next EDM sync
point to be released.
Note: Since these Driver-76 HIPER MCL's exceed the current EDM min/max
level you need to take additional actions to ensure the MCL install and
activate process overrides the current min/max level. To do this you need
to insure that you select the 'check box' "Include internal code changes
which will inhibit Concurrent Upgrade Engineering Changes (EC) task from
being used to apply the next Licensed Internal Code (EC) level." before
installing the Driver-76 HIPER MCL's.
Please contact your next level of support if you have any questions or
require assistance.
POK zSeries
US Service Delivery Planning
Marcy
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-----Original Message-----
From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Aria
Bamdad
Sent: Friday, June 11, 2010 12:17 PM
To: LINUX-390@vm.marist.edu
Subject: [LINUX-390] HIPER MCL for z10 processors
Cross posted to IBMVM and Linux-390 lists.
FYI :
Last Friday there was a Hiper MCL released for z10 processors that addresses
Linux guests running under z10 processors. If you have not seen it, you may
want to investigate and have your CE apply the update.
You can login to the IBM Resource Link site to view the HIPER .
Aria
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For more information on Linux on System z, visit
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