Re: multipath slvm hp-ux 11.23 - asm or raw??
- From: "Ujang Jaenudin" <ujang.jaenudin@xxxxxxxxx>
- To: "Svetoslav Gyurov" <softice@xxxxxxxxx>
- Date: Tue, 12 Feb 2008 08:29:47 +0700
sve, the little conflict now going on between me and hp :) The final configuration on the machine is: 1. each machine has 2 HBA 2. raw LVM configured with pvlink on both nodes 3. OCR & voting disk are placed on that raw LVM 4. oracle datafiles put on ASM (disk which formed asm comes from LUN/disk devices) I created script for manual failover in case 1 HBA failure. 5. no service guard at all. 6. sadly HP said that activate raw LVM on 2 nodes is not supported :( 7. for that kind of configuration HP service guard should be in place - HP 8. I got confirmation from metalink that the above configuration is fully supported 9. anyone has the same configuration? please share for the future problem :) regards ujang On Feb 5, 2008 5:25 PM, Svetoslav Gyurov <softice@xxxxxxxxx> wrote: > > Hi, > > Sorry for the late reply. Well I don't have experience running Oracle RAC > without SG, but I know installations which are running without SG, using > physical raw disks and the cluster is running without any problems. The > performance should be the same, in both cases you are using raw devices. > About stability and management using SG is better by the reasons I said in > the previous mail. > > Regards, > sve > > > > > Ujang Jaenudin wrote: > svetoslav, > > thanks for the details, > you are correct that crs 10g didn't state that we must use slvm. > > for this... > "> ............ snip ...... > > > you can use disks device files as well, BUT first > there is no guarantee that the names of the devices files will be the > same at all nodes and second if someone decide to execute pvcreate at > some of these files there is no warning message and all your data will > be gone." > > how about the experiences about it? stability? performance? > and all over pros & cons? > > I really want to use this kind of solution, due to service guard license. > > regards > ujang > > On Feb 1, 2008 4:20 PM, Svetoslav Gyurov <softice@xxxxxxxxx> wrote: > > > Hi Ujang, > > From Oracle 10g and appearing of Cluster Ready Services it is not > necessary to use SLVM, you can use disks device files as well, BUT first > there is no guarantee that the names of the devices files will be the > same at all nodes and second if someone decide to execute pvcreate at > some of these files there is no warning message and all your data will > be gone. > > About your questions: > 1. If you want to use SLVM you need to use Service Guard and Service > Guard Extension for RAC. > 2. LVM natively have alternate links which offers you failover and not > load balancing if this is what you called multipath. Better way to have > real multipath (load balancing and failover) is to use Secure Path > depending of the mode of the storage (Active-Passive or Active-Active) > and this is for HP-UX 11iv2 (HP-UX 11iv3 does have native multipath for > AA mode). > 3. Yes, I think it is good idea. Depends if you use SLVM then your can > use ASM over SLVM raw device and yes you have at least better management. > 4. Yes, it used to be impossible, but before two years HP released > Service Guard Extension for RAC 11.17 which offered new functionality > called SNOR (Single Node Online Reconfiguration), it is also available > as a patch. Actually this new feature gives you the ability to shutdown > all the nodes in the cluster but one and then on this particular node > you can change the mode of the volume group without deactivating it, > make the appropriate changes, propagate the change to the other nodes, > move the volume group back to shared mode and then activate it at all > other nodes. For more information please read: > http://www.docs.hp.com/en/7389/LVM_SNOR_whitepaper.pdf > 5. In the concepts of HP-UX this is called APA (auto port aggregation), > bonding is on Linux and timing is on Windows. Actually Service Guard > cannot aggregate ports, but can failover NICs by configuring and using > standby network interfaces i.e. your Service Guard is using lan0 for > HEARTBEAT and lan1 is standby network for interface lan0. So in case of > failure of lan0, Service Guard will automatically bring lan1 online and > try to resume the connection to the other node(s) through this interface. > > My personal opinion is to use SLVM over SGeRAC for several reasons: > 1. Control - SG is flexible and offers better control. By using raw > device files once the machine boots the Cluster Ready Services are > started immediately and you have less control. > 2. Identical logical volume names on all nodes on the cluster and naming > convention > 3. Some kind of protection - accidentally doing pvcreate will be refuser > because the device is already initialized > 4. Last but not at least Service Guard support for the SGeRAC Toolkit > giving you integration between SGeRAC and Oracle10g stack. Better > control by using multinode packages, package dependencies, cluster > interconnect subnet monitoring and several other good features. > > Hope it helps. > > -- > sve > > > > Ujang Jaenudin wrote: > > > all, > > I have itanium machine and hp-ux 11.23 installed, with 2 hba for each > machine. > I plan to use Shared LVM - raw. > > - I plan to not use serviceguard > - is shared LVM natively support multipath (i means there is no > multipath software from storage) > - is it good idea to use ASM on top of shared LVM raw device?? - i > thinking of easy management... > i heard on shared LVM could not doing online changes..... > - is NIC bonding/teaming can be configured without serviceguard?? > > thanks for the sharing.... > > > > -- regards ujang "I believe that exchange rate volatility is a major threat to prosperity in the world today" Dr. Robert A. Mundell, Nobel Laureate 1999 -- http://www.freelists.org/webpage/oracle-l
- Re: multipath slvm hp-ux 11.23 - asm or raw??
- From: Svetoslav Gyurov
- Re: multipath slvm hp-ux 11.23 - asm or raw??