Hi, Warning, I inserted a major confusion in my previous email.
When I wrote : >> When I had these horrible performances I was not in a good situations : >> - One 2GB disk SSD 7200RPM per node. >> - DRBD 8.3, Protocol C, Active-Active >> - 2 Network interfaces on a 100Mbits network switch. This is of course SATA Magnetic/Mecanic drive. Thanks for pointing that SSD has to revolution per minute metrics. I'm deeply sorry, So, yes, the SSD completely changed the performances for this solution from a useless one to a working one. And also, the Gigabit card is necessary to reach acceptable performances. When you need fast resync, it's interesting to split your volumes in 2, to have 2 DRBD clusters : with Cross-Cable, you always have the full duplex active, and if you cross sync 2 DRBD volume pairs, you can replicate at 90MB/s in one way, and 90MB/s the other way. (total 180MB/s for resyncing to DRBD volumes with one volume master on each node.) Regards, ----- Mail original ----- De: "Eduardo Diaz - Gmail" <[email protected]> À: "Arnold Krille" <[email protected]> Cc: [email protected] Envoyé: Jeudi 5 Janvier 2012 10:45:21 Objet: Re: [DRBD-user] drbd performance issue on SATA The cost of one PCI-E 1Gb card is for 10€, if you want use a Intel good card, you cand speed 30€.... Change to 1G, this is you problem... On Thu, Jan 5, 2012 at 1:07 AM, Arnold Krille <[email protected]> wrote: > On Wednesday 04 January 2012 13:18:32 François Delpierre wrote: >> I noticed I did not reply to the list. So, here is the copy : >> >> >> Hi Eduardo, >> >> >> When I had these horrible performances I was not in a good situations : >> - One 2GB disk SSD 7200RPM per node. >> - DRBD 8.3, Protocol C, Active-Active >> - 2 Network interfaces on a 100Mbits network switch. > > That will give you 12MB/s for drbd-io. Maybe 24 if trunked/bonded and your > switch does its job right (my hp-switch at home doesn't(*)). > Better not set your hopes to high with the ssd... Altough I never heard of an > ssd with revolutions-per-minute. > > If you encounter low io performance (and you will unless your disks are way > old and PATA without DMA), invest that ~50€ and give each server a gigabit > card. > > Have fun, > > Arnold > > _______________________________________________ > drbd-user mailing list > [email protected] > http://lists.linbit.com/mailman/listinfo/drbd-user > _______________________________________________ drbd-user mailing list [email protected] http://lists.linbit.com/mailman/listinfo/drbd-user
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