[rhn-users] Performance degraded using EMC SAN and QLogic.

[Ifthikhar Ali Khan]

I think you have to enable write cache on EMC SAN using navicli command


navicli -h SPA-IP setcache -wsza 443       == set SPB wc to 443MB
navicli -h SPA-IP setcache -wszb 443       == set SPB wc to 443MB

Substitute your SAN ip address for SPA-IP

Once these commands were issued restart the SAN.

Hope this will resolve.

Regards,
Khan.
SPS, Chennai, INDIA.


-----Original Message-----
From: lin77sys [mailto:lin77sys at yahoo.it] 
Sent: Wednesday, May 18, 2005 2:30 PM
To: RedHat Mailing List
Subject: [rhn-users] Performance degraded using EMC SAN and QLogic.

Hy all, we experienced a bad bug running two new brand
system of ours with Redhat AS v.3 2.4.21-27.0.2.ELsmp.
Three months ago we bought a Storage Area Network EMC
Clariion CX300 with HBA Emulex and a server HP
Proliant 580 connected. We created a LUN RAID5, then a
volume group and a logical volume where formatted an
EXT3 file system 100 GB wide. Well, when we start to
write on an empty filesystem we obtain good
performance until we reach about 80% of total
capacity. After that, performarmances dramatically
degrade (server also fails to respond). We experienced
the same problem on the other new system (HP proliant
DL580, HBA QLogic 2340 and Clariion EMC CX700) which
is reported as totally compliant in the EMC support
Matrix document. 
 
It is a very critical iussue. Of course we contacted
RedHat and EMC but they unfortunately say all the same
thing: it's not my fault! 

Is there any of you who faced this problem ? Any hint
would be very very appreciated.

Best regards.




		
___________________________________ 
Nuovo Yahoo! Messenger: E' molto più divertente: Audibles, Avatar, Webcam, Giochi, Rubrica... Scaricalo ora! 
http://it.messenger.yahoo.it

_______________________________________________
rhn-users mailing list
rhn-users at redhat.com
https://www.redhat.com/mailman/listinfo/rhn-users