Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi, thanks for answers. Comments inline Siim Vahtre wrote: > On Wed, 20 Jun 2007, Marcello Lupo wrote: > >> If i force the sync of the partitions to drbd with invalidate_remote >> it do not go over 12 Mb/sec. > > This doesn't seem normal. > > > Some obligatory questions: > > * Are you sure you actually have working fullduplex Gbit link? (check > with ethtool) > Yes. Settings for eth1: Supported ports: [ MII ] Supported link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Supports auto-negotiation: Yes Advertised link modes: 10baseT/Half 10baseT/Full 100baseT/Half 100baseT/Full 1000baseT/Half 1000baseT/Full Advertised auto-negotiation: Yes Speed: 1000Mb/s Duplex: Full Port: Twisted Pair PHYAD: 1 Transceiver: internal Auto-negotiation: on Supports Wake-on: g Wake-on: d Current message level: 0x000000ff (255) Link detected: yes > * Are you sure you actually can write to your disks faster than > 12Mbytes/sec? (try with benchmarking tool that comes with drbd 'dm.c') > I tried to copy with scp from one machine to the other a 4GB file and it went at ~40Mb/s. Tool you said dm.c the documentation says that is untouched from version 0.6 and not working currently with 0.7 version. SOme times in cat /proc/drbd i see some peak of speed around 18/20 Mb/sec but it is very rare. the average is everytime around 14/15 Mb/sec. Now i tried with bonnie++ and this is the result Version @version@ ------Sequential Output------ --Sequential Input- --Random- -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks-- Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP host0 4G 40987 99 85422 33 45074 11 53951 99 120726 15 1152.6 2 host0 4G 41007 99 88090 34 44630 11 53664 99 122682 16 1169.1 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files:max:min /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP host0 16 17641 99 +++++ +++ 16958 99 19706 100 +++++ +++ 16110 99 host0 16 15767 76 +++++ +++ 17099 99 19778 99 +++++ +++ 16256 10 > * Are you sure nothing else is writing to disks at the same time? > Yes the servers are not used at the moment. I'm just making all preinstall tests of speed and so on before install. >> i tried with rate option to 50M,40M,30M and it is the same. > > * Did you drbdadm adjust after changing config? > I made drbd completely stop and start to be sure all the times i changed the config. > > * Have you searched the mailing-list archives? I think I have seen > several questions like yours, maybe someone has already solved problem > like this. > > I searched for something but found nothing that was usefull to me.. May be i didn't searched so well. Thanks, Bye, Marcello