Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
May be you can increase the rate value of syncer, instead 50M, try 700M. Also
what is the result of command "netstat -i" ? Your device TX or RX is without
errors ?
--
Jeronimo Zucco
LPIC-1 Linux Professional Institute Certified
Núcleo de Processamento de Dados
Universidade de Caxias do Sul
http://jczucco.blogspot.com
Citando Ralf Schenk <rs at databay.de>:
> Hello !
>
> I've a performance problem running drbd 8.0.1 on a XEN Domain-0 (XEN
> 3.0.4-1, Kernel 2.6.16.33 all built from source, Distribution is Ubuntu
> Dapper Server).
>
> DRBD is working, but it's dead slow.
>
> The network is a Gigabit crosslink cabled Network (Intel onboard PCIe
> E1000 Card). The servers are 2x DualXEON 5130 machines (Supermicro). The
> storage System is a 3Ware 9550SX Controller with 3 500GB Seagate SATA
> HDD's as RAID 5. I optimized Controller performance by setting some
> settings /sys/block/sda/queue/XXX as advised by 3Ware and I found one
> comment from one of the DRBD Authors to set "echo 1024 >
> /sys/block/sda/queue/nr_requests" because of the queue depth of the
> 3Ware driver/controller. I also tested with standard settings.
>
> The network interface shows a performance of about 985 Mbit throughput
> measured with iperf. For low CPU usage I set the interfaces to MTU 9000
> (Jumbo frames) but I also tested with MTU of 1500.
>
> Speed on LVM Volume:
> dm -a 0 -o /dev/mb01a/shared -b 1M -s 3g -m -y -p
> 64.03 MB/sec (3221225472 B / 00:47.977005)
>
> Speed on DRBD Device built on above Volume in _disconnected_ mode:
> dm -a 0 -o /dev/drbd2 -b 1M -s 3g -m -y -p
> 34.95 MB/sec (3221225472 B / 01:27.886889)
>
> Thats already disappointing (I hoped to get 75% of the native
> performance out of the drbd device and my network connection could take
> that easily).
>
> Thats what I get in connected mode on the primary
> dm -a 0 -o /dev/drbd2 -b 1M -s 3g -m -y -p
> 2.66 MB/sec (3221225472 B / 19:13.836492)
>
> Thats hard. Are there any experiences out there like this. I think I
> have a problem in my I/O subsystem perhaps related to the combo XEN/DRBD.
>
> All tests were done in a minimal Domain-0 limited to 768 MB memory and
> no other Domains or prcesses running exept a SSH server.
>
> I already tried a bunch of max-buffer/snd-bufffer/unplug watermark etc.
> settings but I couldn't increase the data transfer rate above 5-6
> MB/sec. Also I tried the setting use-bmbv in the disk section which
> didn't help.
>
> This is the latest config:
> resource "shared" {
> protocol C;
> startup {
> wfc-timeout 0; ## Infinite!
> degr-wfc-timeout 120; ## 2 minutes.
> }
> disk {
> on-io-error detach;
> use-bmbv;
> }
> net {
> # allow-two-primaries;
> cram-hmac-alg sha1;
> shared-secret "EV8CbHPLwzIW";
> # timeout 60;
> # connect-int 10;
> # ping-int 10;
> # sndbuf-size 1M;
> max-buffers 8192;
> max-epoch-size 1024;
> # unplug-watermark 32768;
> }
> syncer {
> rate 50M;
> al-extents 257;
> }
>
> on megabad01a {
> device /dev/drbd2;
> disk /dev/mb01a/shared;
> address 10.10.10.1:7791;
> meta-disk /dev/mb01a/drbd[2];
> }
>
> on megabad01b {
> device /dev/drbd2;
> disk /dev/mb01b/shared;
> address 10.10.10.2:7791;
> meta-disk /dev/mb01b/drbd[2];
> }
> }
>
> Bye
> --
> __________________________________________________
>
> Ralf Schenk
> fon (02 41) 9 91 21-0
> fax (02 41) 9 91 21-59
> rs at databay.de
> __________________________________________________
>
> _______________________________________________
> drbd-user mailing list
> drbd-user at lists.linbit.com
> http://lists.linbit.com/mailman/listinfo/drbd-user
>
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