Re: Oracle clusterware related question
Date: Tue, 08 May 2012 16:05:24 +0000
Mathias hit the nail on the head. Think about it this way: NFS errors and disconnects typically do not kill running programs, but cause them to hang. If the binaries for the clusterware are themselves on NFS, then clearly they are going to hang also.
From: Mathias Zarick [mailto:Mathias.Zarick_at_trivadis.com] Sent: Tuesday, May 8, 2012 10:00 AM
Subject: RE: Oracle clusterware related question
Hi Amir,have seen similar behavior if logfiles of crs are also residing on a non available location.you should install at least the CRS home on local disks. if not possible point at leastthe logfiles (symlink CRS_HOME/log to local disks).HTH Mathias-----Original Message-----From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Hameed, AmirSent: Tuesday, May 08, 2012 5:50 PMTo: tim_at_evdbt.com; oracle-l_at_freelists.orgSubject: RE: Oracle clusterware related questionThanks Tim,The cables remained unplugged for 30 minutes. I am using the default values for the "disktimeout" and "miscount" parameters and they are pasted below:crsctl get css disktimeoutCRS-4678: Successful get disktimeout 200 for Cluster Synchronization Services.crsctl get css misscountCRS-4678: Successful get misscount 30 for Cluster Synchronization Services.In my mind, the cluster should have evicted the node after 200 seconds (DTO). Amir-----Original Message-----From: oracle-l-boun ce_at_freelists.org[mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Tim GormanSent: Tuesday, May 08, 2012 11:32 AMTo: oracle-l_at_freelists.orgSubject: Re: Oracle clusterware related questionAmir,Your phrase "/kept showing that the node was still part of the cluster/"doesn't mention how long that state lasted. Clearly, from your email, it lasted too long, but equally obviously, at some point the clusterwarereacted, and I'm wondering how long that wait might have been?Armed with that information about how long it took for the clusterware to react in mind, I'd suggest using the "crsctl query css" command as suggested here in the 11.2 docs online... /crsctl get css/ /Use the |crsctl get css| command to obtain the value of a specific Cluster Synchronization Services parameter./ // /Syntax/ /crsctl get cssparameter / /Usage Notes/ * /Cluster Synchronization Services parameters include:/ /clusterguid diagwait disktimeout misscount reboottime priority logfilesize / * /This command onl y affects the local server/ /Example/ /To display the value of the |disktimeout| parameter for CSS, use the following command:/ /$ crsctl get css disktimeout 200 /So, you may want to share what the values for "disktimeout" and "misscount" were, and whether those values corroborated at all with yourobservations?Hope this helps?--Tim Gormanconsultant -> Evergreen Database Technologies, Inc.postal => PO Box 352151, Westminster CO 80035website => http://www.EvDBT.com/email => Tim_at_EvDBT.commobile => +1-303-885-4526fax => +1-303-484-3608Lost Data? => http://www.ora600.be/ for info about DUDE...On 5/8/2012 8:41 AM, Hameed, Amir wrote:> Folks,> I have a three-node Oracle RAC running with Grid version 18.104.22.168. So,> far there is no database created and only CRS is running on all nodes.I> am using NFS for everything (binaries, OCR& voting disk and database> files). Each server has two 10GbE NICs for dNFS. The binaries, OCR and> voting disks are on an aggregated link (two 1GbE NIC). Th e OS isSolaris> 10.>>>> While doing destructive testing to validate configuration and toobserve> behavior in extreme scenarios, when we pulled cables on one RAC server> from both NICs that are part of the aggregated link for the binaries,> voting disk and OCR, I was expecting that because CRS would not beable> to access the voting disks on that node to update its status,> clusterware would eject that node from the cluster. The "crsctl status> resource -t" command from the other nodes kept showing that the nodewas> still part of the cluster. I am trying to understand this behavior and> would appreciate if someone can explain it.>>> Thanks>> Amir>>> --> http://www.freelists.org/webpage/oracle-l--http://www.freelists.org/webpage/oracle-l--http://www.freelists.org/webpage/oracle-l--http://www.freelists.org/webpage/oracle-l
http://www.freelists.org/webpage/oracle-l Received on Tue May 08 2012 - 11:05:24 CDT