dell blades so slow
Justin Crabtree
crabtrej at otc.edu
Mon Nov 15 14:32:54 UTC 2004
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
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