New to DRBD; using it with two Dell PE2900 systems, CentOS 5.5 64-bit. Two
questions:
(1) I am using dual back-to-back gigabits with mtu=9000 for replication
with bonding in balance-rr mode with no issues. The documentation suggests
that active-backup mode be used. I'm getting an iperf performance across
this link of 1.97 Gbits/sec, and a drbd sync of a single volume gets about
133 MB/sec, which is just a hair quicker than bonnie++ tells me that this
file system can block-write. I'm interested in why the active-backup
recommendation, and other folks' experiences with bonding.
(2) System A (primary) and system B (secondary). If B is shut down, A
maintains a list of out-of-sync blocks for B. Where is this kept? If in
the metadata (internal), how often is it updated on disk? If A is shut
down and rebooted before B comes alive, any chance of losing any updates?
Steve
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Steve Thompson E-mail: smt AT vgersoft DOT com
Voyager Software LLC Web: http://www DOT vgersoft DOT com
39 Smugglers Path VSW Support: support AT vgersoft DOT com
Ithaca, NY 14850
"186,300 miles per second: it's not just a good idea, it's the law"
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