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<TD class=txt width=400 bgColor=#d8d8d8><FONT face="Trebuchet MS; verdana; arial" size=2>Thu, 23 Sep 2004 14:26:04 +0200</FONT></TD></TR></TBODY></TABLE></DIV>
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<TD class=txt width=400 bgColor=#d8d8d8><FONT face="Trebuchet MS; verdana; arial" size=2>Re: [DRBD-user] drbd tranfer limitations (random and sequential acccess) using raw</FONT></TD></TR></TBODY></TABLE></DIV>
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<DIV>> / 2004-09-23 09:01:50 -0300</DIV>
<DIV>> \ crsurf:</DIV>
<DIV>> > Hello list</DIV>
<DIV>> > I?m using drbd in a Gigabit network (crossover cable) and when I</DIV>
<DIV>> > synchronize data (sequential read/write) the tranfer hit to 30~40</DIV>
<DIV>> > Mb/s, but when I make inserts into database (random read/write) that</DIV>
<DIV>> > access drbd device via raw, the transfer rate hit only 5~6 Mb/s.</DIV>
<DIV>> > Exists some way to improve this performance? I increased the</DIV>
<DIV>> > sndbuf-size to 256K, but no such effect. I increase interface MTU to</DIV>
<DIV>> > 9000 and no such effect too. One database process that run in 4 min.</DIV>
<DIV>> > without replication, run in 30 min. with replication. Now I?m trying</DIV>
<DIV>> > using filesystem jfs instead raw to view if the performance will be</DIV>
<DIV>> > improved.</DIV>
<DIV>> > Maybe sync-nice can help us?</DIV>
<DIV>> </DIV>
<DIV>> I am not sure which transfer rate you are talking about.</DIV>
<DIV>> the throughput of your applications, or the resync throughput?</DIV>
<DIV>> </DIV>
<DIV> </DIV>
<DIV>With resync tha transfer hit 40~50 Mb/s, afer I changed MTU.</DIV>
<DIV> </DIV>
<DIV>> or the resync throughput while you have resynchronization and</DIV>
<DIV>> applications running concurrently?</DIV>
<DIV>> </DIV>
<DIV> </DIV>
<DIV>And when I make a insert into database the transfer hit to 4~6 Mb/s, without full synchronization, only online synchronization.</DIV>
<DIV> </DIV>
<DIV>> and when you talk about sync-nice, you are using drbd 0.6 ?</DIV>
<DIV> </DIV>
<DIV>Yes, I´m using 0.6.13</DIV>
<DIV> </DIV>
<DIV>> </DIV>
<DIV>> maybe you want to use 0.7 instead. it reduces the amount of data</DIV>
<DIV>> transfered to a minimum, thus reducing the time for resynchronization to</DIV>
<DIV>> some one to three minutes, typically.</DIV>
<DIV> </DIV>
<DIV>Well, I´m already compiled 0.7.4, but my question is: I can use the config file of 0.6 in 0.7? And the drbdsetup commands to replicate and define primary node are the same?</DIV>
<DIV> </DIV>
<DIV>I will read documentation now, but if you comment this I win some time.</DIV>
<DIV> </DIV>
<DIV>> </DIV>
<DIV>> lge</DIV>
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<DIV>> </DIV>
<DIV> </DIV>
<DIV>Grateful</DIV>
<DIV> </DIV>
<DIV>Cristiano da Costa</DIV></DIV>