Bug 170345 - Max number of scsi devices
Summary: Max number of scsi devices
Status: CLOSED DUPLICATE of bug 164511
Alias: None
Product: Red Hat Enterprise Linux 4
Classification: Red Hat
Component: kernel (Show other bugs)
(Show other bugs)
Version: 4.0
Hardware: All Linux
Target Milestone: ---
: ---
Assignee: Tom Coughlan
QA Contact: Brian Brock
Depends On:
TreeView+ depends on / blocked
Reported: 2005-10-10 21:12 UTC by Hari Kannan
Modified: 2018-10-19 19:16 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of:
Last Closed: 2005-10-13 15:32:49 UTC
Type: ---
Regression: ---
Mount Type: ---
Documentation: ---
Verified Versions:
Category: ---
oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---

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Description Hari Kannan 2005-10-10 21:12:55 UTC
Description of problem:

When more than 512 scsi devices are presented to the system, the /proc reports
"out of memory".  In this scenario, 1024 scsi devices were presented to the
system. About 896 dfevices were reported in /sys/block. 
When attempting to 'cat /proc/scsi/scsi', the system reported "proc : out of memory"

Version-Release number of selected component (if applicable):
Tested on RHEL 4 U2 kernel Kernel - 2.6.9-22.EL, i686, smp

How reproducible:
Happens everytime.

Steps to Reproduce:
1. Present 1024 devices to the system
2. Scan the HBA's in the system
3. cat /proc/scsi/scsi

Problem is seen.
Actual results:
Proc filesystem reports out of memory. System memory still reports over 2GB of
unused RAM space. 

Expected results:
/proc/scsi/scsi should report all the scsi devices. Sysfs should report block
devices for all the LUNS seen. The system should operate fine under normal load.

Additional info:

We would also like to know what the current number of LUNS RHEL 4 U2 supports
and what is planned for RHEL 4 U3

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