Mailing List Archive: DRBD: Users

DRBD 10Gb performance

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julio at knet

Nov 12, 2009, 10:49 AM

Post #1 of 4 (947 views)
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DRBD 10Gb performance

Hello, I have 1 drbd with a size of 2 TB, connected to a dedicated 10Gb Ethernet connection.
The network configuration is:

common {
syncer { rate 100M; }
}

resource vg1Sata {
protocol C;
startup {
wfc-timeout 0; ## Infinite!
degr-wfc-timeout 120; ## 2 minutes.
}

disk {
on-io-error detach;
}

net {
# timeout 60;
# connect-int 10;
# ping-int 10;
# max-buffers 2048;
# max-epoch-size 2048;
max-buffers 20480;
max-epoch-size 16384;
sndbuf-size 128k;
}

on san001.knet.es {
device /dev/drbd2;
disk /dev/sdb2;
address 10.255.255.1:7790;
meta-disk internal;
}

on san002.knet.es {
device /dev/drbd2;
disk /dev/sdb2;
address 10.255.255.2:7790;
meta-disk internal;
}
}

I'm not sure that is correct because I have the following results:

2: cs:SyncSource ro:Primary/Secondary ds:UpToDate/Inconsistent C r----
ns:111347040 nr:0 dw:0 dr:211941504 al:0 bm:12935 lo:0 pe:100 ua:0 ap:0 ep:1 wo:b oos:2226482392
[>....................] sync'ed: 4.8% (2174296/2283032)M
finish: 6:57:24 speed: 88,848 (73,156) K/sec

What are the best values or configuration for a 10Gb connection?

Thanks

Julio Rodan?s Martinez
SISTEMAS DE COMUNICACI?N

[cid:image9c7c78.gif [at] 5d1871b1]
[cid:imageb5f3e0.gif [at] 4cf03eba] Avda. Club Deportivo, 55
26007 Logro?o (La Rioja)
T. 902 44 90 90 F. 941 51 93 92
www.knet.es<http://www.knet.es/>

Pol?tica de privacidad<http://www.knet.es/mail/politica_privacidad.htm>

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m.watts at eris

Nov 13, 2009, 6:10 AM

Post #2 of 4 (905 views)
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Re: DRBD 10Gb performance [In reply to]

On Thu, 2009-11-12 at 19:49 +0100, Julio Rodanes - KNET wrote:
> Hello, I have 1 drbd with a size of 2 TB, connected to a dedicated
> 10Gb Ethernet connection.

<snip>

> What are the best values or configuration for a 10Gb connection?

What kind of disk subsystem do you have? 10Gb networking is irrelevant
if the disks aren't able to write that fast.

Mark.

--
Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower
www.QinetiQ.com
QinetiQ - Delivering customer-focused solutions
GPG Key: http://www.linux-corner.info/mwatts.gpg

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julio at knet

Nov 13, 2009, 10:08 AM

Post #3 of 4 (905 views)
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Re: DRBD 10Gb performance [In reply to]

The subsystem disk is a Adaptec 51645 RAID 5 with 3 disk ST31000340NS

Julio

On Thu, 2009-11-12 at 19:49 +0100, Julio Rodanes - KNET wrote:
> Hello, I have 1 drbd with a size of 2 TB, connected to a dedicated
> 10Gb Ethernet connection.

<snip>

> What are the best values or configuration for a 10Gb connection?

What kind of disk subsystem do you have? 10Gb networking is irrelevant if the disks aren't able to write that fast.

Mark.

--
Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower www.QinetiQ.com QinetiQ - Delivering customer-focused solutions GPG Key: http://www.linux-corner.info/mwatts.gpg

Julio Rodanés Martinez
SISTEMAS DE COMUNICACIÓN
Avda. Club Deportivo, 55
26007 Logroño (La Rioja)
T. 902 44 90 90 F. 941 51 93 92
http://www.knet.es/
http://www.knet.es/mail/politica_privacidad.htm

_______________________________________________
drbd-user mailing list
drbd-user [at] lists
http://lists.linbit.com/mailman/listinfo/drbd-user

m.watts at eris

Nov 16, 2009, 4:55 AM

Post #4 of 4 (856 views)
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Re: DRBD 10Gb performance [In reply to]

On Fri, 2009-11-13 at 19:08 +0100, Julio Rodanes - KNET wrote:
> The subsystem disk is a Adaptec 51645 RAID 5 with 3 disk ST31000340NS

Well, those are 7200 rpm 1TB SATA-II disks.
In theory, they vary from ~55MB/sec to ~100MB/sec across the platters
during linear operations, but RAID-5 does add overhead.

The Adaptec card I would expect to be able to extract full performance
from each drive on their own, but I have no idea

Have you tried any benchmarks on the array both with and without DRBD to
see what the native performance actually is? Preferably you'd test using
striping and mirroring too so you get a feel for how much of an impact
raid-5 is.

Mark.

--
Mark Watts BSc RHCE MBCS
Senior Systems Engineer, Managed Services Manpower
www.QinetiQ.com
QinetiQ - Delivering customer-focused solutions
GPG Key: http://www.linux-corner.info/mwatts.gpg

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