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linux cluste
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05-04-2010 09:12 PM
05-04-2010 09:12 PM
linux cluste
linux cluste
we are building two node cluster using oracle linux. On one node I have craeted the cluster file systems.Now How to make it visible to another node like in HP service gurad we will do vgexport/import the map file.
Thanks,
Prashant
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05-04-2010 10:29 PM
05-04-2010 10:29 PM
Re: linux cluste
Re: linux cluste
First, make sure both nodes can see the actual disks/LUNs at the hardware level.
If necessary, see RedHat's Online Storage Reconfiguration Guide form making the disks/LUNs visible without a reboot. Most of the techniques within it are applicable to all Linux distributions, not just RedHat.
https://www.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/html/Online_Storage_Reconfiguration_Guide/index.html
If you used traditional PC partition tables, use "partprobe" (if available) or "sfdisk -R /dev/
If you used LVM, run "vgscan". Then see what is required by your clustering software.
Non-cluster filesystems like ext3 will become corrupted if mounted on two or more nodes at the same time, so a clustering software will usually have some sort of a locking mechanism to make sure it does not happen by accident.
Cluster filesystems like OCFS or GFS can be mounted by multiple nodes simultaneously, but the nodes will usually need to communicate with each other over the network to coordinate their operations. If you're mounting a cluster filesystem, make sure this communication works before actually mounting the filesystem on the 2nd node.
MK
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05-05-2010 01:15 AM
05-05-2010 01:15 AM
Re: linux cluste
Re: linux cluste
In hp unix we will do the vgexport/import on adotive node . How we need to do it linux so that file system will be available on adoptive node when failover occur.
Regards,
Prashant
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05-05-2010 04:51 AM
05-05-2010 04:51 AM
Re: linux cluste
Re: linux cluste
You might also use the commands "pvs", "vgs" and "lvs" to verify the PV/VG/LV visibility.
In Linux with 2.6.* kernel, the device files for the LVs will be created automatically when you activate the VG, not before.
MK
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05-05-2010 07:13 AM
05-05-2010 07:13 AM
Re: linux cluste
Re: linux cluste
Is this a RAC Cluster? If so, probably would be better if you use ASM or OCFS2. In this case, LVM should be avoided.
If not, ¿what cluster software are you using?
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05-05-2010 09:17 AM
05-05-2010 09:17 AM
Re: linux cluste
Re: linux cluste
we are using the oracle clusterware.
Regards,
Prashant
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05-05-2010 01:52 PM
05-05-2010 01:52 PM
Re: linux cluste
Re: linux cluste
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05-05-2010 08:11 PM
05-05-2010 08:11 PM
Re: linux cluste
Re: linux cluste
For creating the ocfs2 first we need to create the
1) pv
2) vg
3)lv
then need to use ocfs2 file sytem for creating the file system.
I think in linux no need to do the export/import. after doing vgscan on secondary node the vgs will be visible, Is it correct.
-----------
Using ASM, Could you please share the the document if you have related to form the cluster using ASM
Thanks,
Prashant
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05-06-2010 06:37 AM
05-06-2010 06:37 AM
Re: linux cluste
Re: linux cluste
1) pv
2) vg
3)lv
That is incorrect, you create the OCFS file system direct over the "RAW" device. This should be a persistent name defined with udev for example. Both nodes should have the same device name. You won't create logical volumes on these devices, just a partition and then the file system.
ASM is a DB administrator duty. You only give to him the device names (No lvm again).
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