Re: Oracle clusterware related question
Date: Tue, 08 May 2012 16:43:40 +0000
According to the directives of the "disktimeout" and "misscount" parameters, yes.
From: Hameed, Amir [mailto:Amir.Hameed_at_xerox.com] Sent: Tuesday, May 8, 2012 10:11 AM
To: tim_at_evdbt.com, Mathias.Zarick_at_trivadis.com Cc: oracle-l_at_freelists.org
Subject: RE: Oracle clusterware related question
So, if voting disks are not updated by a certain node for any reason for an extended period of time, that node would not be evicted by the remote nodes from the cluster?
From: Tim Gorman [mailto:tim_at_evdbt.com]
Sent: Tuesday, May 08, 2012 12:05 PM
To: Mathias.Zarick_at_trivadis.com; Hameed, Amir Cc: oracle-l_at_freelists.org
Subject: Re: Oracle clusterware related question
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 least the 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, Amir Sent: Tuesday, May 08, 2012 5:50 PM To: tim_at_evdbt.com; oracle-l_at_freelists.org Subject: RE: Oracle clusterware related question Thanks 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 disktimeout CRS-4678: Successful get disktimeout 200 for Cluster Synchronization Services. crsctl get css misscount CRS-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----- F rom: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Tim Gorman Sent: Tuesday, May 08, 2012 11:32 AM To: oracle-l_at_freelists.org Subject: Re: Oracle clusterware related question Amir, 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 clusterware reacted, 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 logfil esize / * /This command only 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 your observations? Hope this helps? -- Tim Gorman consultant -> Evergreen Database Technologies, Inc. postal => PO Box 352151, Westminster CO 80035 website => http://www.EvDBT.com/ email => Tim_at_EvDBT.com mobile => +1-303-885-4526 fax => +1-303-484-3608 Lost 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 188.8.131.52. 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 dis ks are on an aggregated link (two 1GbE NIC). The OS is Solaris > 10. > > > > While doing destructive testing to validate configuration and to observe > 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 be able > 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 node was > 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-lReceived on Tue May 08 2012 - 11:43:40 CDT