Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi list,
I've just set up a 2 node cluster:
Hardare: 1 CPU (current Xeon), 12 GB RAM, RAID 1, 1 *100 Mbit, 1* 1Gbit Ethernet
Storage: Raid 1 (300GB), partitions for OS, Swap and DRBD-Device (160GB).
Software: SLES 11, drbd 8.2.7, heartbeat 2.99, Oracle 10.2.0.4
Current drbd settings:
global {
dialog-refresh 1;
minor-count 5;
}
common {
syncer {
rate 50M;
}
net {
after-sb-1pri discard-secondary;
after-sb-2pri disconnect;
after-sb-0pri discard-zero-changes;
}
startup {
degr-wfc-timeout 120;
wfc-timeout 0;
}
handlers {
split-brain "/usr/lib/drbd/notify-split-brain.sh root";
}
}
resource oradata {
protocol C;
disk {
on-io-error pass_on;
}
on elsserverbeta {
device /dev/drbd0;
address 192.168.5.3:7788;
meta-disk internal;
disk /dev/sda3;
}
on elsserveralpha {
device /dev/drbd0;
address 192.168.5.2:7788;
meta-disk internal;
disk /dev/sda3;
}
}
DRBD uses the Gbit-Ethernet connection for replication.
The DRBD-device holds the Oracle data (data and redolog files).
The application which runs on top of the HA-Stack uses a lot of small transactions.
Oracle throws following warning: "log write time 760 ms, size 8 KB".
If the drbd-stack on the second node (elsserverbeta) is stopped, the application is "fast" (2 to 3 times faster).
Any idea ?
Regards, Klaus
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