[DRBD-user] Speed Sync seems to be limited on gigabit ethernet

Mark Watts m.watts at eris.qinetiq.com
Thu Jun 21 10:53:48 CEST 2007

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

> Hi Mike,
> yes i'm sure the interface is right... Checking it with ifconfig i see
> tons of gigabytes transferred on the crossover interface and no data on
> the esternal
> interface during sync and with tcpdump too.
> As i said before i hope there is something to modify in the config to
> reach more speed.
> This are the results of syncing 2 different resources (56Gb each) on the
> same 2 machines and disks at the same time:
> drbd0: Resync done (total 4428 sec; paused 0 sec; 9992 K/sec)
> drbd0: drbd0_worker [31817]: cstate SyncSource --> Connected
> drbd1: Resync done (total 5556 sec; paused 0 sec; 10568 K/sec)
> drbd1: drbd1_worker [31821]: cstate SyncSource --> Connected
> So the connection is able to reach at least 20Mb/sec using drbd. The
> problem seems to be the stability. When i sync only one resource i get
> no more than 14/15Mb/sec as average. Instead syncing 2 resources the
> average goes to 20Mb/sec so it seems to be really some limitation
> on the drbd resource sync.
> Someone else around have a similar config:
> 2 HP Proliant DL380 with 2 processors Xeon 3Ghz 2 GB ram.
> 2 disks SCSI Ultra 320 of 146 Gb in raid 1 on each machine  with Smart
> array 6i controller?

When I did the initial (~300GB) sync from the internal raid-1 of one Dell 
PowerEdge 1950 to another identical one (both 2 x Xeon) across a GigE x-over 
cable, I was averaging ~55MB/sec, which is about the limits of those systems.


Mark Watts BSc RHCE MBCS
Senior Systems Engineer
QinetiQ Trusted Information Management
Trusted Solutions and Services Group
GPG Key: http://keyserver.veridis.com:11371/search?q=0x455420ED
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