Difference between revisions of "Training-high-availability"
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mdadm --assemble --config /clusterconf/NA1/mdadm.conf /dev/md0 | mdadm --assemble --config /clusterconf/NA1/mdadm.conf /dev/md0 | ||
| + | |||
| + | == Create lvm == | ||
| + | pvcreate /dev/md0 | ||
| + | vgcreate sapvg /dev/md0 | ||
| + | lvcreate -L 145G sapdb | ||
== Start lvm == | == Start lvm == | ||
Revision as of 15:30, 29 April 2009
Contents |
Concepts
Cluster Resource Agents are told by the Cluster Manager "start up" or "shut down".
Host-based mirroring
Host-based mirroring is done with mdadm. Besides, there is
- log shipping
- synchronous mirroring
Autoyast
install=http://... autoyast=http://...
Migration
A migration in the sense of SAP is a change of OS or DB, but not an upgrade or update.
URLs
IPs
10.31.19.101 sapna1ci 10.31.19.102 sapna1db
Definitions
- SID is NA1
- user na1adm id 2000, group 2000
- user sdb 2001, group 2001
- user sqdna1 id 2002
- ascs gets instance number 00
- ci gets instance number 02
- we use IBM Java 1.4.2
Decisions
- We use a simple stack, that means, if a server goes down, the complete stack switches over to the other node, accepting downtime.
Progress
Start multipath
/etc/init.d/boot.multipath start /etc/init.d/multipathd start multipath -ll
fdisk
Make a little partition for the quorum (SFEX) and a large partition for the rest.
mdadm
mdadm.conf:
DEVICE /dev/disk/by-id/scsi-360a98000486e5337524a4f6a4e43542d-part2 ARRAY /dev/md0 level=raid0 num-devices=1 UUID=357d721b:86058e8c:8d746cf9:a620ae3c
mdadm --assemble --config /clusterconf/NA1/mdadm.conf /dev/md0
Create lvm
pvcreate /dev/md0 vgcreate sapvg /dev/md0 lvcreate -L 145G sapdb
Start lvm
vgscan vgdisplay lvdisplay vgchange -a y sapvg
Mount the vgs
mount /dev/sapvg/usrsap /usr/sap mount /dev/sapvg/sapdb /sapdb mount /dev/sapvg/sapmnt /sapmnt
Java
Install java
yast -i java-1.4.2-ibm
SAP
Install
ASCS
./sapinst SAPINST_USE_HOSTNAME sapna1as
Choose Netweaver -> Application Server ABAP -> MaxDB -> High Availability -> ASCS
DB
./sapinst SAPINST_USE_HOSTNAME sapna1db
Choose Netweaver -> Application Server ABAP -> MaxDB -> High Availability -> db instance
CI
./sapinst SAPINST_USE_HOSTNAME sapna1ci
Start
startsap sapna1as startsap sapna1ci
Pitfalls
- forgot to have luns before installing
- forgot to use SAPINST_USE_HOSTNAME => had to uninstall ASCS
