[Pvfs2-users] error is setting up storage space for PVFS2 1.5.1

[Phil Carns]

I haven't followed this thread that closely, but if the problem is 
shared memory support in the db library, then you could try setting this 
config file option:

<StorageHints>
...
	DBCacheType mmap
...
</StorageHints>


That will make berkeley db use mmap for the cache rather than shared 
memory.  If the error code is well defined then it should be possible to 
insert some code to have it fall back to mmap if the shmem options fail, 
or maybe just print a descriptive error message suggesting that the user 
try that option.

I happen to have a centos 4 test box here, but I haven't seen this 
problem before.  Here are the kernel and db versions that it is using:

$ uname -a
Linux centos 2.6.9-34.0.1.EL #1 Wed May 24 07:40:56 CDT 2006 i686 i686 
i386 GNU/Linux

$ rpm -qa |grep db4
db4-devel-4.2.52-7.1
db4-4.2.52-7.1
db4-utils-4.2.52-7.1

-Phil

Sam Lang wrote:
> 
> Hi Greg,
> 
> The path of least resistance for you is to probably build your own  db4 
> and point pvfs2 at that with the --with-db to configure.  The db  you 
> have installed seems to have been configured with some options  that 
> disable using shared memory for the cache.
> 
> In the long term we should probably look at handling the case where  the 
> db isn't configured to work with shared memory.
> 
> -sam
> 
> On Jul 11, 2006, at 7:04 PM, Greg Bruno wrote:
> 
>> On 7/11/06, Robert Latham <robl at mcs.anl.gov> wrote:
>>
>>> On Tue, Jul 11, 2006 at 09:13:12AM -0700, Greg Bruno wrote:
>>> > ./configure --prefix=/opt/pvfs2 --with-kernel=/usr/src/linux-2.6
>>> > make
>>> > make install
>>>
>>> Can you tell us what kernel you are running?  It sounds like you  might
>>> be running a stock kernel.org kernel?
>>
>>
>> the node has pre-compiled kernel downloaded from a centos mirror:
>>
>> # uname -a
>> Linux compute-0-0.local 2.6.9-34.0.1.ELsmp #1 SMP Wed May 24 08:14:29
>> CDT 2006 i686 i686 i386 GNU/Linux
>>
>>
>> # rpm -qi kernel-smp
>> Name        : kernel-smp                   Relocations: (not  
>> relocatable)
>> Version     : 2.6.9                             Vendor: CentOS
>> Release     : 34.0.1.EL                     Build Date: Wed 24 May
>> 2006 05:22:43 AM PDT
>> Install Date: Mon 10 Jul 2006 09:31:34 AM PDT      Build Host:  
>> build-i386
>> Group       : System Environment/Kernel     Source RPM:
>> kernel-2.6.9-34.0.1.EL.src.rpm
>> Size        : 28928141                         License: GPLv2
>> Signature   : DSA/SHA1, Wed 24 May 2006 02:17:52 PM PDT, Key ID  
>> a53d0bab443e1821
>> Packager    : Johnny Hughes <johnny at centos.org>
>> Summary     : The Linux kernel compiled for SMP machines.
>> Description :
>> This package includes a SMP version of the Linux kernel. It is
>> required only on machines with two or more CPUs as well as machines  with
>> hyperthreading technology.
>>
>> Install the kernel-smp package if your machine uses two or more CPUs.
>>
>>
>> - gb
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>>
> 
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