====== DB2 pureScale ======
===== Installation & Configuration =====

**Linux pre-requisites :**
<sxh bash>
yum -y install 
</sxh>

**Change redhat release :**
<sxh bash>
Red Hat Enterprise Linux Server release 6.7 (Santiago)
</sxh>

**Install DB2 on-all nodes !**

**Prepare /var/ct/cfg/netmon.cf :**
<sxh bash>
!IBQPORTONLY !ALL
!REQD eth0 192.168.88.10
!REQD eth3 192.168.56.1
</sxh>

**Update existing instance to pureScale **:
<sxh bash>
./db2iupdt -cf db2dev01 -cfnet db2dev01-hadr -m db2dev01 -mnet db2dev01-hadr -mid 0 -instance_shared_dev /dev/sda -tbdev /dev/sdb -u db2pure1 db2pure1
</sxh>

**Create new instance :**

===== GPFS =====
==== Create GPFS FS Cluster ====
**Create GPFS Cluster filesystem domain :**
<sxh bash>
db2cluster -cfs -create -domain db2cluster_TEST.unixguest.eu -host db2purescaleA
</sxh>

**Set the GPFS Tiebreaker to disk device :**
<sxh bash>
db2cluster -cfs -set -tiebreaker -disk /dev/sdb
</sxh>

**Start the GPFS Cluster :**
<sxh bash>
db2cluster -cfs -start -all
</sxh>

**Create Instance shared FS :**
<sxh bash>
db2cluster -cfs -create -filesystem db2inst1_shared -disk /dev/sdc -mount /db2inst1/shared
</sxh>


**List shared filesystems :**
<sxh bash>
db2cluster -cfs -list -filesystem
</sxh>

**Stop GPFS filesystems :**
<sxh bash>
db2cluster -cfs -stop -all
</sxh>

**Add new GPFS filesystem :**
<sxh bash>
db2cluster -cfs -create -filesystem db2fs_data_01 -disk /dev/sdb -mount /db2_DATA_01
</sxh>

**Remove shared GPFS FS & GPFS Domain :**
<sxh bash>
# List the FS
db2cluster -cfs -list -filesystem

# Change the tiebreaker to Majority
db2cluster -cfs -stop -all
db2cluster -cfs -set -tiebreaker -majority
db2cluster -cfs -start -all

# Delete all shared files
db2cluster -cfs -mount -filesystem db2fs1
rm -rf </mount/point>/.*

# Remove the Shared FS
db2cluster -cfs -delete -filesystem db2fs1

# Remove the RSCT Domain
db2cluster -cfs -stop -all
db2cluster -cfs -list -domain
db2cluster -cfs -delete -domain <DOMAIN>

# Clear the DB2 glogal registry
db2greg -delvarrec service=GPFS_CLUSTER,variable=NAME,installpath=-
db2greg -delvarrec service=DEFAULT_INSTPROF,variable=DEFAULT,installpath=-
</sxh>

**Enable PR-3 Reservations :**
<sxh bash>

</sxh>

===== GPFS =====
**Check GPFS cluster configuration :**
<sxh bash>
mmlscluster
</sxh>


===== Troubleshooting =====
**If primary GPFS cluster fails, designate new primary server :**
<sxh bash>
mmchcluster -p <NEWPRIMARY> -s <NEWSECONDARY>
</sxh>

**Cluster Ping tool :**
<sxh bash>
[[http://www-01.ibm.com/support/docview.wss?uid=swg21967473]]
</sxh>

**Enable member node as Quorum node :**
<sxh bash>
export CT_MANAGEMENT_SCOPE=2
chrsrc -s 'Name="<NODENAME>"' IBM.PeerNode IsQuorumNode=1
</sxh>

**Enable failback mode for RG :**
<sxh bash>
1. Log in as root from any cluster node
2. export CT_MANAGEMENT_SCOPE=2
3. rgreq -o lock db2_db2sdin1_0-rg
4. rgreq -o lock db2_db2sdin1_1-rg
5. chrsrc -s "MemberOf = 'db2_db2sdin1_0-rg'" IBM.ManagedResource SelectFromPolicy=3
6. chrsrc -s "MemberOf = 'db2_db2sdin1_1-rg'" IBM.ManagedResource SelectFromPolicy=3
7. rgreq -o unlock db2_db2sdin1_0-rg
8. rgreq -o unlock db2_db2sdin1_1-rg
</sxh>

**Attaching to DB2 processes / generating core dumps :**
<sxh bash>

-Lock all member resource groups as root

rgreq -o lock db2_inst0_0-rg
rgreq -o lock db2_inst0_1-rg
rgreq -o lock db2_inst0_2-rg
rgreq -o lock db2_inst0_3-rg

-Gather a core file ( on Linux attach and gcore from gdb, on AIX by gencore )

-Unlock all members?as follows as root

rgreq -o unlock db2_inst0_0-rg
rgreq -o unlock db2_inst0_1-rg
rgreq -o unlock db2_inst0_2-rg
rgreq -o unlock db2_inst0_3-rg
</sxh>

**Enable GPFS failover on multipath :**
<sxh bash>
http://www-01.ibm.com/support/docview.wss?uid=swg22003235&myns=swgimgmt&mynp=OCSSEPGG&mync=E&cm_sp=swgimgmt-_-OCSSEPGG-_-E
</sxh>

**Kerberos authentication**
  - Create KRB database
<sxh bash>
kdb5_util create -s
</sxh>