We are running on RHEL5.1 x86_64 and haven't yet experienced any issues as 

described in the bug report... 
We just rebuilt a few weeks ago from RHEL4 32bit.

We did see about a 36% increase in throughput across our 2Gb FC afs 
devices when staging to our 2Gb FC LTO3 drives.
Average rate went from 75MB/s to 102MB/s when staging.

Whether that was due to the 64-bit OS or improvements in the native Qlogic 

FC driver is still debatable.



Scott Larsen
Sr. Network Engineer, RHCE
Cascade Corporation
scott.larsen AT cascorp DOT com
W: +1.503.669.6208
M: +1.503.333.9792
--------------------------------------------------------- 


EMC NetWorker discussion <NETWORKER AT LISTSERV.TEMPLE DOT EDU> wrote on 
04/18/2008 12:24:41:

> Not sure how to read below, which according to the 7.4sp2 release 
> notes is still a problem. Have others on this experienced the 
> mentioned crashes and/or learned more details?
> 
> All else being equal, I would strongly prefer to upgrade my old 7.2.
> 2/RHEL3 i386 server to 7.4.2/RHEL5 x86_64. It seems that I will want
> to run the 32-bit rather than 64-bit version of the NetWorker 
> binaries, but as long as I have the right compatibility libraries, 
> that should be fine, right?
> 
> Running the Linux 64-bit package with the 2.6.x kernel may result in 
crashes LGTsc06585 
> A compatibility issue with libc and pthreads libraries on Linux 2.6 
kernel-based 
> environments causes problems when running the 64-bit package for Linux 
on 
> platforms built on the 2.6.x kernel (for example, RedHat AS 4 and SuSE 
SLES 9). 
> Although operation may be normal at first, continued use of the 64-bit 
package 
> with a 2.6.x kernel may result in crashes of various programs. 
> Use the 32-bit package when running with a 2.6.x kernel. Running a 
32-bit package 
> instead of the 64-bit package should have no operational impact. The 
64-bit 
> package can still be used for kernel version 2.4 Linux variants such as 
RedHat AS 3 
> and SuSE SLES 8. 
> 
> Rich Graves http://claimid.com/rcgraves
> Carleton.edu Sr UNIX and Security Admin
> CMC135: 507-646-7079 Cell: 952-292-6529

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