Bug 311751 - host has 194 LUNs and each LUNs has 15 partitions now. Start with PowerPath also cause the server hang.
host has 194 LUNs and each LUNs has 15 partitions now. Start with PowerPath a...
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: udev (Show other bugs)
All Linux
low Severity high
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Assigned To: Harald Hoyer
Depends On:
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Reported: 2007-09-28 17:16 EDT by Pan Haifeng
Modified: 2012-06-20 11:55 EDT (History)
1 user (show)

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Doc Type: Bug Fix
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Last Closed: 2012-06-20 11:55:33 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Pan Haifeng 2007-09-28 17:16:13 EDT
Description of problem:

In such configuration, during powerpath start, after PP has presented the
native and pseudo devices to the Linux kernel, udev and hotplug systems
trigger thousands events and each of this event spawns a udev and hotplug
process. In this transient system state, the server has more then 5000
hotplug processes  and around 3000 udev processes. [ Hotplug and udev
processes present currently available devices to the /dev directory.]. It
takes a long time for these processes to finish, because the partition
events have to wait for the main block device event so the partition event
can import the parents information, already stored in the udev database.
The performance consequences of this to the server can be summarized in a
single word - catastrophe

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Comment 1 Jiri Pallich 2012-06-20 11:55:33 EDT
Thank you for submitting this issue for consideration in Red Hat Enterprise Linux. The release for which you requested us to review is now End of Life. 
Please See https://access.redhat.com/support/policy/updates/errata/

If you would like Red Hat to re-consider your feature request for an active release, please re-open the request via appropriate support channels and provide additional supporting details about the importance of this issue.

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