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

[lin77sys]

   Hy, we resolved the problem deleting (rpm -e) and
reinstalling latest version of powerpath. It seemed it
was a dirty installation because we couldn't erase the
old package. 
   We had to install the new version (rpm -ivh) and
then delete the older version with (rpm -e).

   However, now it works fine.

   Thanks.
 

--- Ifthikhar Ali Khan <ifthikar at sps.co.in> ha
scritto: 

> 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.
> 
> 
> 
> 
> 		
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