Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Curtis Tiffany wrote: > I used tiobench and bonnie when testing performance. The systems sound similar to yours, they are Dell Poweredge 2650, > dual Xeon, 5 disk RAID5, 2 GB RAM. I've attached the output from each... first of all: Thanks for the output ... i see I have a real performance problem somewhere ... bonnie++ gives around 8 MB/s for writing on the local disks. However the block device for bonnie++ testing was an LVM Logical Volume. I will testing without LVM. Also I try to "tune" the Adaptec controller. I will post new information about this topic tomorrow. Hope to find the problem. > I used tiobench and bonnie when testing performance. The systems sound > similar to yours, they are Dell Poweredge 2650, dual Xeon, 5 disk RAID5, > 2 GB RAM. I've attached the output from each... > > For drbd-3.htm here's a key > /home1000c - testing disk, drbd, and network You used bonnie on a drbd device and got 25.62 (MB/sec?) for Sequential Writes and 6.35 (MB/sec?) for Random Writes? That's a good performance. Tested with tiobench for drbd-3.htm? > /root1000c - testing disk without drbd Why is /root1000c slower (5.22) than /home1000c (6,35) for Random Writes? Thanks a lot! To Lars: Great, i will use the tool tomorrow to find the bottleneck! Also I've made a new posting to the LVM thread. To Holger: > Are the network and disks on a 64-Bit PCI channel and are these working in > 64 bit mode? 32-bit PCI bus will not manage. But even a 32 bit bus should > do more then 7MB/s, so something is wrong with your raid5 or network > card/driver. Are there any messages in /var/log/messages? Nope, no negative messages at all ... but i will watch ... The NICs are onboard (Intel GBit) and the network is not the problem (NetIO with TCP/IP around 100 MB/sec). The disk controller (Adaptec 2110S) is on a PCI X bus, so what? Disks are SCSI U320 10K RPM a 64 GB capacity. Any hints? Again: Thanks to all! Greetings, Andreas Semt