1. Steeleye HA 솔루션에서 사용되는 Datakeeper는 물리적으로 독립된 Storage 또는 Data Volume을 사용하는 n개의 HA DB Node간 Data sync를 위해 사용되는 솔루션으로 Shared 구조의 DB Volume 환경에서는 이용되지 않는다.
따라서 Datakeeper Solution이 설치된 HA 환경에서는 Datakeeper Sync 아키텍처 구조에 따라 아래와 같이 mdadm 으로 구성된 Software RAID Device를 확인 할 수 있다.
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[root@TESTDB01 ~]#
[root@TESTDB01 ~]# lklicmgr
License File: 20111021.lic
Product Type Expiry Other
SteelEye Data Replication ARK Perm
LifeKeeper for Linux Perm
Oracle Listener Recovery Kit Perm
Oracle Recovery Kit Perm
LVM Recovery Kit (1/2) Perm
LVM Recovery Kit (2/2) Perm
[root@TESTDB01 ~]#
[root@TESTDB01 ~]#
[root@TESTDB01 ~]# mdadm --detail --scan
ARRAY /dev/md0 level=raid1 num-devices=2 metadata= bitmap=/opt/LifeKeeper/bitmap__data
ARRAY /dev/md4 level=raid1 num-devices=2 metadata= bitmap=/opt/LifeKeeper/bitmap__archive
ARRAY /dev/md3 level=raid1 num-devices=2 metadata= bitmap=/opt/LifeKeeper/bitmap__pg_xlog
[root@TESTDB01 ~]#
[root@TESTDB01 ~]#
[root@TESTDB01 ~]# mirror_status 0
Mirror Configuration:
[ ] TESTDB01 -> HMSDB02 (10.220.142.185)
Status: Fully Operational
[===================>] 100%
Type: Synchronous
Bitmap: 2498560 bits (chunks), 2 dirty (0.0%)
[root@TESTDB01 ~]#
[root@TESTDB01 ~]#
[root@TESTDB01 ~]# mirror_status 4
Mirror Configuration:
[ ] TESTDB01 -> HMSDB02 (10.220.142.185)
Status: Fully Operational
[===================>] 100%
Type: Synchronous
Bitmap: 3276758 bits (chunks), 0 dirty (0.0%)
[root@TESTDB01 ~]#
[root@TESTDB01 ~]#
[root@TESTDB01 ~]# mirror_status 3
Mirror Configuration:
[ ] TESTDB01 -> HMSDB02 (10.220.142.185)
Status: Fully Operational
[===================>] 100%
Type: Synchronous
Bitmap: 655360 bits (chunks), 2 dirty (0.0%)
[root@TESTDB01 ~]#
[root@TESTDB01 ~]# |
2. Steeleye Datakeeper 데이터 흐름도
HA VIP (Active Node) -> Database Listener -> Filesystem Mount Point (/data) -> Kernel Software RAID Device (RAID 0 - /dev/md0) -> Local Disk (/dev/sda5) / NBD Device (/dev/nbd0) -> Standby Node NBD Server (Data sync)
