Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
> -----Original Message----- > From: Leroy van Logchem [mailto:leroy.vanlogchem at wldelft.nl] > Sent: Wednesday, February 21, 2007 11:04 AM > To: drbd-user at linbit.com > Subject: Re: [DRBD-user] Performance with DRBD + iSCSI > > > > Discover the latency for 1 block sized packet of data to > travel from one > > host to another, say for a 4k packet. > > > > 24 packets transmitted, 24 received, 0% packet loss, time 23022ms > > rtt min/avg/max/mdev = 0.164/0.226/0.290/0.038 ms, pipe 2 > > This is because each 4k io operation, the standard for file system > > operations, needs to travel across the network. > > > Thanks for sharing this. If this proves to be useful, please include > this in the > drbd documentation under section e.g.: expectations. > > When I apply these to our cross linked e1000's: IOPS=3558 at 15MB/s. > Why does normal O_SYNC i/o on ext3 using 0.7.23 top this by a factor 5 > or more? I thought 0.7.x did uses small bio's. Explain the test procedure you used and your setup a little more and I can get a better picture of your scenario. -Ross ______________________________________________________________________ This e-mail, and any attachments thereto, is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution or copying of this e-mail, and any attachments thereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify the sender and permanently delete the original and any copy or printout thereof.