dell blades so slow

[Justin Crabtree]

Scott Ryan wrote:
> On Fri, 2004-11-12 at 15:32 -0600, Justin Crabtree wrote:
> 
>>We have several Dell blade servers, model 1655MC, being used as ldap 
>>servers.  These are dual PIII machines with 1G RAM and two mirrored U160 
>>SCSI drives with a U320 controller.  They currently have Fedora Core 2 
>>installed with version 2.1.29 of OpenLDAP running.  We have been 
>>experiencing all kinds of latency and iowait problems with these servers 
>>compared with other hardware setups.  Has anyone else encountered any 
>>similar problems?
>>
> 
> 
> I use dell 1650s and 1750s for openldap 2.1.30 ldbm (bdb) backend
> I am running EL2.1 and these babys can handle up to 15k req/min.
> 
> I found a huge performance degradation when i tested with RHEL3.0 and
> when i used bdb backend.
> 
> My suggestion is to try increasing the dbcache and the number of entries
> openldap stores in cache. This would decrease the amount of disk reads
> and should improve your I/O.
> 
> 
>>-- 
>>Justin Crabtree
>>Java Programmer
>>Ozarks Technical Community College
>>799-1573
>>
>>
>>

Is this a driver issue or is it something in the OS itself?  I have 
tried tuning the cache in openldap and it helped but it is still way 
slower than the test server we setup on a supposedly inferior platform, 
IDE drives, less memory, one processor.


Justin Crabtree
Java Programmer
Ozarks Technical Community College
799-1573