Red Hat Bugzilla – Bug 170345
Max number of scsi devices
Last modified: 2010-10-21 23:31:07 EDT
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
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.
Proc filesystem reports out of memory. System memory still reports over 2GB of
unused RAM space.
/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.
We would also like to know what the current number of LUNS RHEL 4 U2 supports
and what is planned for RHEL 4 U3