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Redhat Cluster NFS client service – things to notice

Byetzion

I encountered an interesting bug/feature of RHCS on RHEL4. A snip of my configuration looks like this: <resources> <fs device=”/dev/mapper/mpath6p1″ force_fsck=”1″ force_umount=”1″ fstype=”ext3″ name=”share_prd” mountpint=”/share_prd” options=”” self_fence=”0″ fsid=”02001″/> <nfsexport name=”nfs export4″/> <nfsclient name=”all ro” target=”192.168.0.0/255.255.255.0″ options=”ro,no_root_sqush,sync”/> <nfsclient name=”app1″ target=”app1″ options=”rw,no_root_squash,sync”/> </resources> <service autostart=”1″ domain=”prd” name=”prd” nfslock=”1″> <fs ref=”share_prd”> <nfsexport ref=”nfs export 4″> <nfsclient ref=”all ro”/>…

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Oracle RAC with EMC iSCSI Storage Panics

Byetzion

I have had a system panicking when running the mentioned below configuration: RedHat RHEL 4 Update 6 (4.6) 64bit (x86_64) Dell PowerEdge servers Oracle RAC 11g with Clusterware 11g EMC iSCSI storage EMC PowerPate Vote and Registry LUNs are accessible as raw devices Data files are accessible through ASM with libASM During reboots or shutdowns,…

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Hot adding Qlogic LUNs – the new method

Byetzion

I have demonstrated how to hot-add LUNs to a Linux system with Qlogic HBA. This has become irrelevant with the newer method, available for RHEL4 Update 3 and above. The new method is as follow: echo 1 > /sys/class/fc_host/host/issue_lip echo “- – -” > /sys/class/scsi_host/host/scan< Replace "<ID>" with your relevant HBA ID. Notice - due...

Bonding in RedHat RHEL4

Byetzion

This is a rather common knowledge now that on RHEL4 you need to state inside /etc/modprobe.conf the following line, when you want more than one bonding interfaces: options bonding max_bonds=2 Then you attempt to use a trick to address different bonding devices with their name (aka, bond0 and bond1, and maybe bond2, etc), using an…

Vlan Tagging with bonding network interface on RHEL4

Byetzion

This is not a simple task, as there are few things which should actually happen for it to work. First – the switch port should support vlan tagging (of course, right?) I have used vlan2 for “external” network, and vlan3 for “internal” network. My configuration looks like this: ifcfg-eth0: DEVICE=eth0 BOOTPROTO=none ONBOOT=yes MASTER=bond0 SLAVE=yes ISALIAS=no…

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RedHat 4 working cluster (on VMware) config

Byetzion

I have been struggling with RH Cluster 4 with VMware fencing device. This was also a good experiance with qdiskd, the Disk Quorum directive and utilization. I have several conclusions out of this experience. First, the configuration, as is: <?xml version=”1.0″?> <cluster alias=”alpha_cluster” config_version=”17″ name=”alpha_cluster”> <quorumd interval=”1″ label=”Qdisk1″ min_score=”3″ tko=”10″ votes=”3″> <heuristic interval=”2″ program=”ping vm-server…