[DRBD-user] Transfer rates
helmut.wollmersdorfer at gmx.at
Thu Jun 24 18:32:17 CEST 2004
Daniel Khan schrieb:
> Could someone provide some figures which real troughput can be expected
> with drbd and 1000Mbit.
> 0: cs:SyncingAll st:Primary/Secondary ns:20803700 nr:0 dw:0 dr:20803860
> pe:15 ua:0
> [>...................] sync'ed: 3.8% (305724/317546)M
> finish: 2:59:12h speed: 29,274 (28,962) K/sec
That's near the maximum speed of yor disks - isn't it?
At sync you have only drbd in a very efficient mode, the disks and the
network. You have only read on primary disk, write on secondary disk.
> NFS gives me only 120Mbit if I test with dd.
Now you add dd and NFS to the above "time consumers", plus write on
primary disk. This definitely cannot be faster than sync at maximum
possible speed, it should be slower. Here it's ~50% of sync, not a
> So something might be wrong here....
- check, that you can exclude network, storage, cpu as reason
- review your drbd and NFS config, try to fine tune it
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