Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi, Actually my gut feeling was that drbd-8.0 would perform better than drbd-0.7.17, since it allows and uses BIOs up to 32KB of data, while the 0.7 code only allows up to 4KB of data in a single BIO (that is caused by the Linux-2.4.x compatibility) But on recent hardware, the CPU is so fast that the bigger BIOs bring no measurable advantage. CPU: Intel(R) Pentium(R) D CPU 3.20GHz ram: 2G IO subsystem: 3ware Inc 9xxx-series SATA-RAID Kernel: rhas4(centOS) 2.6.9-22.EL [root at node2 tmp]# /root/dm -a 0 -o testfile -s 1G -y -m -p -b 1M version: 8.0pre2a (api:81/proto:80) SVN Revision: 2144M build by root at baumeister, 2006-04-12 11:17:47 Full sync: drbd0: Resync done (total 4372 sec; paused 0 sec; 41388 K/sec) drbd0: Resync done (total 3995 sec; paused 0 sec; 45296 K/sec) with filesystem (dm -a 0 -o testfile -s 1G -y -m -p -b 1M): (outer cylinders?) 33.11 MB/sec (1073741824 B / 00:30.930201) 32.06 MB/sec (1073741824 B / 00:31.941736) 32.29 MB/sec (1073741824 B / 00:31.712577) w/o FS (inner cylinders) 52.30 MB/sec (1073741824 B / 00:19.579340) 54.06 MB/sec (1073741824 B / 00:18.941363) 53.76 MB/sec (1073741824 B / 00:19.047350) version: 0.7.17 (api:77/proto:74) SVN Revision: 2093 + GFP_NOIO fix build by root at baumeister, 2006-03-13 13:19:09 w FS (dm -a 0 -o testfile -s 1G -y -m -p -b 1M): (outer cylinders?) 33.01 MB/sec (1073741824 B / 00:31.020205) 32.55 MB/sec (1073741824 B / 00:31.454737) 32.71 MB/sec (1073741824 B / 00:31.303779) w/o FS (inner cylinders) 54.13 MB/sec (1073741824 B / 00:18.916885) 54.50 MB/sec (1073741824 B / 00:18.788823) 53.22 MB/sec (1073741824 B / 00:19.240387) -Philipp -- : Dipl-Ing Philipp Reisner Tel +43-1-8178292-50 : : LINBIT Information Technologies GmbH Fax +43-1-8178292-82 : : Schönbrunnerstr 244, 1120 Vienna, Austria http://www.linbit.com :