<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Times New Roman; font-size: 12pt; color: #000000'>Hi,<br><br>Warning, I inserted a major confusion in my previous email. <br><br>When I wrote :<br>>> When I had these horrible performances I was not in a good situations :<br>>> - One 2GB disk SSD 7200RPM per node.<br>>> - DRBD 8.3, Protocol C, Active-Active<br>>> - 2 Network interfaces on a 100Mbits network switch.<br><br>This is of course SATA Magnetic/Mecanic drive. Thanks for pointing that SSD has to revolution per minute metrics.<br><br>I'm deeply sorry, <br><br>So, yes, the SSD completely changed the performances for this solution from a useless one to a working one.<br><span>And also, the Gigabit card is necessary to reach acceptable performances.<br>When you need fast resync, it's interesting to split your volumes in 2, to have 2 DRBD clusters :<br>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.)<br><br>Regards,<br><br><br></span><br><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;"><b>De: </b>"Eduardo Diaz - Gmail" <ediazrod@gmail.com><br><b>À: </b>"Arnold Krille" <arnold@arnoldarts.de><br><b>Cc: </b>drbd-user@lists.linbit.com<br><b>Envoyé: </b>Jeudi 5 Janvier 2012 10:45:21<br><b>Objet: </b>Re: [DRBD-user] drbd performance issue on SATA<br><br>The cost of one PCI-E 1Gb card is for 10€, if you want use a Intel<br>good card, you cand speed 30€....<br><br>Change to 1G, this is you problem...<br><br>On Thu, Jan 5, 2012 at 1:07 AM, Arnold Krille <arnold@arnoldarts.de> wrote:<br>> On Wednesday 04 January 2012 13:18:32 François Delpierre wrote:<br>>> I noticed I did not reply to the list. So, here is the copy :<br>>><br>>><br>>> Hi Eduardo,<br>>><br>>><br>>> When I had these horrible performances I was not in a good situations :<br>>> - One 2GB disk SSD 7200RPM per node.<br>>> - DRBD 8.3, Protocol C, Active-Active<br>>> - 2 Network interfaces on a 100Mbits network switch.<br>><br>> That will give you 12MB/s for drbd-io. Maybe 24 if trunked/bonded and your<br>> switch does its job right (my hp-switch at home doesn't(*)).<br>> Better not set your hopes to high with the ssd... Altough I never heard of an<br>> ssd with revolutions-per-minute.<br>><br>> If you encounter low io performance (and you will unless your disks are way<br>> old and PATA without DMA), invest that ~50€ and give each server a gigabit<br>> card.<br>><br>> Have fun,<br>><br>> Arnold<br>><br>> _______________________________________________<br>> drbd-user mailing list<br>> drbd-user@lists.linbit.com<br>> http://lists.linbit.com/mailman/listinfo/drbd-user<br>><br>_______________________________________________<br>drbd-user mailing list<br>drbd-user@lists.linbit.com<br>http://lists.linbit.com/mailman/listinfo/drbd-user<br></div><br></div></body></html>