[DRBD-user] Opteron/Xeon - Kernel 2.4/2.6 setup
helmut.wollmersdorfer at gmx.at
Mon Jun 14 11:57:04 CEST 2004
Daniel Khan schrieb:
> rsync has another disandavantage - it's consumes much CPU power on
> checking for updates.
> I tried this once and I had massive load peaks.
Don't think, that CPU usage of DRBD is unimportant.
During full sync with drbd on 600 MHz / 1200 BogoMips, 100 Mbit NIC, I
get total CPU usage of 50% (without it is "idle" at 0.5 - 1.5%, plain
IDE disks, no memory problems). This means, that I will hit the CPU
bottleneck at a sync-rate of 200 Mbit, before the PCI-Bus limit of 400 Mbit.
For a sync-rate of 1 Gbit on a 3 GHz CPU I would estimate 100% CPU
usage, but you will hit the disk bottleneck before.
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