topic Re: Memory usage on ia64 hp Integrity Virtual Partition in Operating System - HP-UX

Memory usage on ia64 hp Integrity Virtual Partition

kampatel — Thu, 13 Nov 2014 01:35:48 GMT

Need to understand how memory is used on the Virtual server. The Glance report show memory is 100% and swap usage around 83%

Glance 11.11.025               16:49:46 Server     ia64                                                                       Current Avg High
------------------------------------------------------------------------------------------------------------------------------------------------------
CPU Util   SU                                                           U                                                           | 53%   53%   53%
Disk Util   F   F                                                                                                                    | 4%    4%    4%
Mem Util   S                     SU                                                                                    UF        F |100% 100% 100%
Swap Util   U                                                                UR                                 R                    | 83%   83%   83%

Total VM : 15.9gb   Sys Mem :   3.1gb   User Mem: 11.6gb   Phys Mem : 16.0gb
Active VM:   6.5gb   Buf Cache:     0mb   Free Mem:    71mb   FileCache:   1.2gb
MemFS Blk Cnt:              0   MemFS Swp Cnt:              0

Swap usage:

#swapinfo -tam
                 Mb          Mb           Mb   PCT      START/          Mb
TYPE          AVAIL        USED         FREE USED       LIMIT     RESERVE PRI NAME
dev            8192        1189         7003   15%           0           -    1 /dev/vg00/lvol2
reserve           -        7003        -7003
memory        16328       12277         4051   75%
total         24520       20469         4051   83%       -           0    -

Please assist in understanding if this is a memory bottleneck. Do I need to allocate more memory to this virtual server?

There is no performance issue observed on the server, however I am worried that the glance shows memory as 100%.

P.S. This thread has been moved from HP-UX > System Administration to HP-UX > virtualization. - Hp Forum Moderator

Re: Memory usage on ia64 hp Integrity Virtual Partition

chindi — Tue, 11 Nov 2014 06:00:23 GMT

Hi ,

Its an IVM or VPAR guest ??

Re: Memory usage on ia64 hp Integrity Virtual Partition

RJHall — Wed, 12 Nov 2014 18:29:31 GMT

Installation of the IntegrityVM BB068AA bundle at 11i v3 changes several kernel tunables as follows:

maxdsiz_64bit -> 34359738368

filecache_min -> ${CACHE_SZ}*

filecache_max -> ${CACHE_SZ}*

lockable_mem_pct -> 99%

base_pagesize -> 64

vx_ninode -> 131072

vxfs_ifree_timelag -> -1

vxfs_bc_bufhwm -> 64000

* where CACHE_SZ is (1) 134,217,728 if `getconf MEM_MBYTES` returns a value >= 13,421, or (2) 1% otherwise.

For us this shows up as 100% memory usage, and I believe that is what it is expected to show for a VM. But it's bad news if you accidently load the bundle on a non-VM OS instance.

Re: Memory usage on ia64 hp Integrity Virtual Partition

Stan_M — Thu, 13 Nov 2014 07:58:36 GMT

Yes, your vPar is under memory pressure and you should add some memory, based on swapinfo, it should be at least 2G more. Newer HPVM versions allow dynamic addition of memory - see whitepaper under www.hp.com/go/hpux-hpvm-docs

Re: Memory usage on ia64 hp Integrity Virtual Partition

Dave Olker — Thu, 13 Nov 2014 13:47:09 GMT

BB068AA should only be installed on the bare-metal system or nPar acting as the hypervisor. That product does tune the kernel specifically to free up physical memory so that the hypervisor can use the memory for VM or vPar guests. This product should *not* be installed inside a VM or vPar virtual server.

Even with this product installed on the physical system, I typically see the physical hypervisor running at around 90% physical memory utilization, not 100%. This is by design. If you are referring to a vPar that is running at 100% memory then I would assign more memory to the vPar as Stan has recommended.

To be clear - is the system under memory pressure you are asking about the physical server running BB068AA (i.e. the hypervisor or VSP) or is it a vPar? What specific version of Integrity VM/vPars are you running?

Dave