Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hello! I test the I/O Performance using dm and bonnie. I am confused that the drbd Performance is only the half than directly on the /dev/sda device. For testing purposes I've only one single node because i want to test the I/O of the SCSI Controller, not of DRBD. 633#po-b:/root/dm -a 0 -o /srv/ha/drbd0/test.bin -y -p -s 3000M 49.45 MB/sec (3145728000 B / 01:00.673287) 634#po-b:/root/dm -a 0 -o /tmp/test.bin -y -p -s 3000M 89.42 MB/sec (3145728000 B / 00:33.549299) DRBD Partition: Version 1.03 ------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 po-b 16G 41103 83 50722 17 27017 7 32580 58 51254 5 660.8 1 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ test,16G,41103,83,50722,17,27017,7,32580,58,51254,5,660.8,1,16,+++++,+++ +++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++ Normal Partition: Version 1.03b ------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 ubuntu 6G 43931 98 100033 37 41393 9 47964 94 80047 8 1064 4 ------Sequential Create------ --------Random Create-------- -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete-- files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP 16 +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ +++++ +++ ubuntu,6G,43931,98,100033,37,41393,9,47964,94,80047,8,1064.4,4,16,+++++, +++,+++++,+++,+++++,+++,+++++,+++,+++++,+++,+++++,+++ 635#test:cat /proc/drbd version: 0.7.16 (api:77/proto:74) SVN Revision: 2066 build by root at po-b, 2006-05-04 19:43:22 0: cs:WFConnection st:Primary/Unknown ld:Consistent ns:0 nr:0 dw:78907684 dr:50645498 al:23293 bm:23550 lo:0 pe:0 ua:0 ap:0 mfg S.Novak