https://community.hpe.com/t5/operating-system-hp-ux/kernel-memory-fragmentation-vs-vxfs/m-p/2441951#M7852 A problem was found with Veritas filesystem on Solaris systems as can be seen at the following URL: <A href="http://seer.support.veritas.com/tnotes/FILESYSTEM/198200.htm" target="_blank">http://seer.support.veritas.com/tnotes/FILESYSTEM/198200.htm</A><BR />A performance degradation occurs on systems with large memory under some circumstances because of kernel memory fragmentation. I was wondering if HP-UX (10.20 or 11.0) could suffer from a similar problem when JFS (vxfs filesystems) is used. We are running 8 K460/4way servers with 2GB RAM under HP-UX 10.20 with lots of vxfs filesystems. Each server is managing up to 200 GB disk space.<BR /><BR />Daniel. Thu, 31 Aug 2000 20:09:35 GMT Daniel Proulx 2000-08-31T20:09:35Z https://community.hpe.com/t5/operating-system-hp-ux/kernel-memory-fragmentation-vs-vxfs/m-p/2441951#M7852 A problem was found with Veritas filesystem on Solaris systems as can be seen at the following URL: <A href="http://seer.support.veritas.com/tnotes/FILESYSTEM/198200.htm" target="_blank">http://seer.support.veritas.com/tnotes/FILESYSTEM/198200.htm</A><BR />A performance degradation occurs on systems with large memory under some circumstances because of kernel memory fragmentation. I was wondering if HP-UX (10.20 or 11.0) could suffer from a similar problem when JFS (vxfs filesystems) is used. We are running 8 K460/4way servers with 2GB RAM under HP-UX 10.20 with lots of vxfs filesystems. Each server is managing up to 200 GB disk space.<BR /><BR />Daniel. Thu, 31 Aug 2000 20:09:35 GMT https://community.hpe.com/t5/operating-system-hp-ux/kernel-memory-fragmentation-vs-vxfs/m-p/2441951#M7852 Daniel Proulx 2000-08-31T20:09:35Z https://community.hpe.com/t5/operating-system-hp-ux/kernel-memory-fragmentation-vs-vxfs/m-p/2441952#M7853 Daniel:<BR /><BR />I don't know how this might/might not relate to HP-UX. With 11.x there are two new kernel parameters for tuning VxFS's inode cache. Perhaps you will find document #KBRC00002354 of interest, now or later.<BR /><BR />There is also an 11.x critical patch available -- PHKL_22121 (s700_800 11.00 JFS 3.3 I/O cumulative Patch) which you may want to look at.<BR /><BR />...JRF... Thu, 31 Aug 2000 20:41:14 GMT https://community.hpe.com/t5/operating-system-hp-ux/kernel-memory-fragmentation-vs-vxfs/m-p/2441952#M7853 James R. Ferguson 2000-08-31T20:41:14Z