Tuning for performance

[Jan-Erik Soderholm XA (TN/PAC)]

Hi.
The original OP didn't say what VMS version.
AFAIK, the 127 block dir cache limit (and I don't
think raising ACP_DIRCACHE helped actualy) was
removed in some later VMS version. Maybe 7.x.

And deleting/moving files out of the DIR doesn't
make the DIR file smaller. Use DFU to compress
DIR files.

Jan-Erik.

> -----Original Message-----
> From:
> samba-vms-bounces+jan-erik.soderholm=pac.ericsson.se at lists.samba.org
> [mailto:samba-vms-bounces+jan-erik.soderholm=pac.ericsson.se at l
> ists.samba
> .org]On Behalf Of COLLOT Jean-Yves
> Sent: den 3 februari 2004 12:19
> To: 'Profaizer, Joe'; 'samba-vms at samba.org'
> Subject: RE : Tuning for performance
> 
> 
> Actually, as you may guess, the bad performance is due to the 
> number of
> files in a directory (in fact, the size of the directory 
> (.DIR) file), not
> of the size of the files themselves. Because of the RMS 
> directory caching
> feature, the real gap is when the directory file is bigger 
> than 127 blocks.
> 
> The bad performances in such a situation (huge .DIR file(s)) 
> are not limited
> to Samba, however. Even a simple "DIR" DCL command may be 
> quite slow. When
> you browse a Samba shared directory through the Windows 
> Explorer, it's more
> or less the same as executing a "DIR/SIZE" command on this 
> directory. Is
> Samba much slower than DIR/SIZE ?
> 
> The only thing I know that can enhance the performance 
> problem in that case
> is to increase the ACP_DIRCACHE sysgen parameter, in order to 
> make it big
> enough to cache the whole big directory. The first access to 
> the directory
> is slow, but subsequent accesses are notably better. 
> 
> Jean-Yves
> 
> -----Message d'origine-----
> De : Profaizer, Joe [mailto:JProfaizer at rgare.com] 
> Envoye : lundi 2 fevrier 2004 20:28
> A : 'samba-vms at samba.org'
> Objet : Tuning for performance
> 
> I just installed samba 2.2.8 and I have a subdirectory that 
> is very large
> (100GB of many files).  I'm curious as to what performance 
> tuning parmeters
> I can adjust to help performance.  The performance is extremely slow.
> 
> 
> Thanks,
> 
> ..Joe
> PLEASE READ THIS IMPORTANT ETIQUETTE MESSAGE BEFORE POSTING:
> 
> http://www.catb.org/~esr/faqs/smart-questions.html
> PLEASE READ THIS IMPORTANT ETIQUETTE MESSAGE BEFORE POSTING:
> 
> http://www.catb.org/~esr/faqs/smart-questions.html
> 

This communication is confidential and intended solely for the addressee(s). Any unauthorized review, use, disclosure or distribution is prohibited. If you believe this message has been sent to you in error, please notify the sender by replying to this transmission and delete the message without disclosing it. Thank you.

E-mail including attachments is susceptible to data corruption, interruption, unauthorized amendment, tampering and viruses, and we only send and receive e-mails on the basis that we are not liable for any such corruption, interception, amendment, tampering or viruses or any consequences thereof.