Hi, I´m running Proxmox 4.2 which is debian jessy with a software RAID of 2 Tb SATA disks of 7200 RPM in a dedicated server.
I have set it up using OVH Proxmox installer with ext4. I have realized that another server with just one SATA disk has writes of about 140 MB/s while this server with 2 disks has just reads around 40 MB/s: root@myserver:~# hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 11800 MB in 2.00 seconds = 5903.84 MB/sec Timing buffered disk reads: 136 MB in 3.17 seconds = 42.94 MB/sec root@myserver:~# hdparm -Tt /dev/md4 /dev/md4: Timing cached reads: 11356 MB in 2.00 seconds = 5682.49 MB/sec Timing buffered disk reads: 132 MB in 3.10 seconds = 42.52 MB/sec root@myserver:~# pveperf /vz/ CPU BOGOMIPS: 42669.12 REGEX/SECOND: 935261 HD SIZE: 1809.50 GB (/dev/mapper/pve-data) BUFFERED READS: 94.56 MB/sec AVERAGE SEEK TIME: 17.88 ms FSYNCS/SECOND: 10.15 DNS EXT: 16.93 ms DNS INT: 23.36 ms (ibertrix-node2) from specs from the manufacturer average seek time is around 8 ms writes on the other hand seem to be fine: root@myserver:~# dd if=/dev/zero of=/mytempfile ^C15210305+0 records in 15210305+0 records out 7787676160 bytes (7.8 GB) copied, 52.1116 s, 149 MB/s performance from a VM (I have 5 VMs running in this 32 Gb RAM server) running Centos 6.8: root@vm [~]# dd if=/dev/zero of=/mytempfile ^C9360176+0 records in 9360176+0 records out 4792410112 bytes (4.8 GB) copied, 112.571 s, 42.6 MB/s root@vm [~]# hdparm -Tt /dev/sda /dev/sda: Timing cached reads: 7778 MB in 2.00 seconds = 3892.00 MB/sec Timing buffered disk reads: 122 MB in 3.59 seconds = 34.02 MB/sec I´m running 4.4.15-1-pve kernel. Is there any way to improve the performance of ext4 both in the hosting proxmox server and the virtual machines? Regards,
