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=Comment: #0=================================================
Emily J. Ratliff <emilyr.com> - 2008-09-24 13:52 EDT
1. Feature Overview:
Feature Id: [201764]
a. Name of Feature: Installer enhancement - FICON Hyper PAV enablement
b. Feature Description
DASD related configuration dialogs should not present HyperPAV Alias devices as targets for the
following operations: formatting file system creation mounting The reason behind this is that
even when a HyperPAV Alias device is set online, no separate block device will be created by the
kernel. Without a block device, none of the operations can be performed. It should be possible to
configure DASD HyperPAV Alias devices to be automatically activated (set online) during
installation/boot. If an Alias device is not online, it will not be used by the DASD driver.
Note: with Hyper PAV, no multipath configuration is needed, since everything in handled by the DASD
driver.
2. Feature Details:
Sponsor: zSeries
Architectures:
s390x
Arch Specificity: Both
Affects Installer: Yes
Delivery Mechanism: Request Red Hat development assistance
Category: Installation
Request Type: Installer - Enhancement from Distributor
d. Upstream Acceptance: No Code Required
Sponsor Priority 1
f. Severity: High
IBM Confidential: no
Code Contribution: no
g. Component Version Target: n/a
3. Business Case
Customers will observe increased and sustained I/O performance improvements exploiting parallel
Access Volume (PAV) support for disk storage access. Supporting HyperPAV will lead to significantly
reduced configuration efforts as opposed to static PAV setups with the system dynamically self
optimizing its I/O configuration.
4. Primary contact at Red Hat:
John Jarvis
jjarvis
5. Primary contacts at Partner:
Project Management Contact:
Hans-Georg Markgraf, mgrf.com, Boeblingen 49-7031-16-3978
Technical contact(s):
Gonzalo Muelas Serrano, gmuelas.com
IBM Manager:
Thomas Schwarz, t.schwarz.com
Why isn't this using the normal dm-multipath layer?
Comment 2Gonzalo Muelas Serrano
2008-11-27 14:17:10 UTC
Because is not needed anymore since now the multipathing for DASD Base+Alias devices is directly implemented in the DASD driver, because with the new DASD driver the aliases devices are not even block devices, which I think is needed for dm-multipath.
Let me know if you want to discuss further DASD driver implementation details with the DASD driver developer and I will be happy to set up a conf. call.
More information about PAV and HyperPAV can be found under:
http://www.ibm.com/developerworks/linux/linux390/development_documentation.html
How to Improve Performance with PAV - SC33-8414-00
Comment 3Gonzalo Muelas Serrano
2008-11-27 14:18:10 UTC
We are out of capacity to complete this for RHEL 6.0 and a Fedora implementation needs to be completed before inclusion in RHEL. Adding to RHEL 6.1
tracker for consideration for that release.
------- Comment From mgrf.com 2010-02-19 09:22 EDT-------
Hello Red Hat,
As per System z work via Fedora 12 this should work in RHEL6.
If limitations get observed in beta tests
-> it can be mentioned in release notes.
Based on the last comment, closing this as CURRENTRELEASE. Please open a new bug report if any issues are found in testing the implementation in RHEL 6.0.