[DRBD-user] Performance issue

Maciej Bogucki macbogucki at gmail.com
Tue Aug 12 16:12:55 CEST 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

Sampo Blom wrote:
> I have two:
> Intel Q6600 boxes with 4GB of RAM
> 8 x 750Gb (4,5TB RAID5EE, Adaptec 2820SA)
> 2 x 1Gbit Ethernet
> eth0: LAN
> eth1: DRBD SYNC (crosscable between machines)
> /dev/sda2 ~4,5TB for DRBD
> The problem is that, when I connect to an ftp/samba server on LAN 
> (eth0) and I start uploading a file. Transfer rate is about 20-40MB/s 
> about 10-15 seconds, then it starts lagging, about 4-10MB/s. 
> Transfer-rate sleeps 0MB/s 5 seconds for example and all ftp transfers 
> gets timeout.
> I have monitored eth1 with iptraf, and it doesn’t sync more that 
> 6-10MB/s while drbd state is (cs:Connected st:Primary/Secondary 
> ds:UpToDate/UpToDate C r---).
> When drbd does sync while other end has been offline for a while… sync 
> rate is about 20-25MB/s.

1. Test You network between the two boxes with fe. netperf
2. Test disc read/write speed with fe. bonnie++

Best Regards
Maciej Bogucki

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