[DRBD-user] Increase perfomance with external meta-disk driver...

Gilberto Nunes Ferreira gilberto.nunes at selbetti.com.br
Fri Oct 30 12:03:44 CET 2009

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


Hi

I am very newbie on DRBD...
But I am search with some tricks to improve performance.
I deploy a drbd resource and use this drbd.conf:

global { usage-count no; }
common {
         syncer
        {
                rate 200M;
                al-extents 3833;
        }

        disk {
                no-disk-barrier;
                no-disk-flushes;
                no-md-flushes;
                use-bmbv;
        }
}
resource r0 {
        protocol C;
        startup {
                wfc-timeout 15;
                degr-wfc-timeout 60;
                become-primary-on both;
        }
        net {
                sndbuf-size 0;
                rcvbuf-size 0;
                max-buffers     16384;
                unplug-watermark   16384;
                max-epoch-size  16384;
                cram-hmac-alg sha1;
                shared-secret "drbd123";
                allow-two-primaries;
                after-sb-0pri discard-zero-changes;
                after-sb-1pri discard-secondary;
                after-sb-2pri disconnect;
       }
       on kvm-0 {
                device /dev/drbd0;
                disk /dev/sda3;
                address 10.0.0.100:7788;
                meta-disk internal;
        }
        on kvm-1 {
                device /dev/drbd0;
                disk /dev/sda3;
                address 10.0.0.110:7788;
                meta-disk internal;
        }
}
                
    The net adresses run on gigabyte network cards with crossover
pathcable....

    Google's results show me some testimonial that an external meta-disk
can be used to improve some performance...

    My question is: Is that true? If yes, how can I do to have external
driver to do meta-disk??? 

   Thanks

Gilberto Nunes Ferreira
TI
Selbetti Gestão de Documentos
Telefone: +55 (47) 3441-6004
Celular: +55 (47) 8861-6672 


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