The first step in my exploration of IPV6 was to get an IPV6 address via an IPV4 to IPV6 tunnel. A little research lead me to the fine folks at SixXS.
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- Format and mount the SAN LUN.
- Start a write to the mounted filesystem
cat /dev/zero >> /pathto/mnt/testfile &
- Now connect to the multipath daemon in interactive mode
- View current paths with
show maps topology
multipathd> show maps topology reload: mpath5 (360060e801045249004f2a5f900000031) dm-7 HITACHI,DF600F [size=128G][features=0][hwhandler=0][rw] \_ round-robin 0 [prio=1][active] \_ 1:0:0:4 sdb 8:16 [active][ready] \_ round-robin 0 [prio=0][enabled] \_ 2:0:0:4 sdc 8:32 [active][ready]
- There are two paths shown as sdb and sdc. Delete one path.
del path sdb
- Suspend with ctrl-z and check that the write is still happening.
ls -l /pathto/mntIf testfile is still growing then the path sdc is working.
- Resume multipath with
fg 2. Re-add the path.
add path sdb
- Now remove the other path.
del path sdc
- Again suspend iwth ctrl-z and check that the test file is growing. If so
then resume multipath and re-add the path.
add path sdc
- Testing complete. Exit with
ctrl-c. Kill the write job with
kill %1. Remove the test file.
|Show network info||
|Segment network into 2 50 node subnets||
|Add/delete IP addresses||
Linux Ethernet bonding
Click for more Ethernet bonding information.# Loading module: # for Red Hat AS4, may work with other 2.6 Linuxes. install bond0 /sbin/modprobe bonding -o bond0 mode=0 miimon=100 # for Red Hat AS3, may work with other 2.4 Linuxes. alias bond0 bonding options bond0 -o bonding mode=0 miimon=100 # For Redhat distributions # ifcfg-ethx DEVICE=ethx USERCTL=no ONBOOT=yes MASTER=bond0 SLAVE=yes BOOTPROTO=none # ifcfg-bond0 DEVICE=bond0 USERCTL=no ONBOOT=yes IPADDR=172.16.48.66 NETMASK=255.255.255.0 GATEWAY=172.16.48.1
OSI model diagram
This entry offers solutions to system administration problems using the configuration management tool Cfengine 2. Cookbook now available for Cfengine 3.
This entry presents an overview of how to build a DB2 service cluster using the Red Hat Cluster Suite. This procedure can be useful in learning how to setup clusters for other services.