Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Network between two boxes carried data prox. 110MB/s, so I took sync rate 33M (110 x 0,3 = 33M). Command line used: iozone -s 262144 -f /data/export/test Output is in Kbytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 Kbytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 262144 4 401183 529283 3022257 2880264 2431338 1035372 2778243 1177529 2508961 407557 608464 3008315 2866530 iozone test complete. -Sampo -----Original Message----- From: Maciej Bogucki [mailto:macbogucki at gmail.com] Sent: 12. elokuuta 2008 17:13 To: Sampo Blom Cc: drbd-user at lists.linbit.com Subject: Re: [DRBD-user] Performance issue Sampo Blom wrote: > > I have two: > > Intel Q6600 boxes with 4GB of RAM > > 8 x 750Gb (4,5TB RAID5EE, Adaptec 2820SA) > > 2 x 1Gbit Ethernet > > eth0: LAN > > eth1: DRBD SYNC (crosscable between machines) > > /dev/sda2 ~4,5TB for DRBD > > The problem is that, when I connect to an ftp/samba server on LAN > (eth0) and I start uploading a file. Transfer rate is about 20-40MB/s > about 10-15 seconds, then it starts lagging, about 4-10MB/s. > Transfer-rate sleeps 0MB/s 5 seconds for example and all ftp transfers > gets timeout. > > I have monitored eth1 with iptraf, and it doesn't sync more that > 6-10MB/s while drbd state is (cs:Connected st:Primary/Secondary > ds:UpToDate/UpToDate C r---). > > When drbd does sync while other end has been offline for a while... sync > rate is about 20-25MB/s. > 1. Test You network between the two boxes with fe. netperf 2. Test disc read/write speed with fe. bonnie++ Best Regards Maciej Bogucki