Hi,
My configuration is as follow:
Debian Etch x64 on an OVH dedicated server with a quad proc Intel xeon, 2x750GBHDD in SATA HARD RAID1, 4GB DDR2. ReiseFS filesystem for all partition except boot which is in ext3.
Two vritual machines stored on a 600GB datastore. One is using 50GB, the second one, 26GB. The datastore filesystem is ReiserFS.
The virtual Machines are both based on the same template, with Debian Etch x32. Both are running Plesk 9.0. The VM disks are distributed in 4 VMDK each. One per partition. One for root, one for home, one for var and a last one for swap.
Plesk Backup is using tar and gzip.
VM1 has 18 domaines, with average traffic. WM2 has almost no traffic at all.
When plesk backup is running, IOWAIT for VM1 goes up to 99.7% iowait permanently. IOWAIT for VM2 goes up to 99.7% as soon as there is any activity on it. And the host goes up to 40% iowait. It seems pretty c
Questions:
Could it be due to reiserFS ?
Is it a problem to run 4 vmdk per vm on the same host drive ?
How can I troubleshoot this ?
Plesk backup takes hours, and the sites are extreemely slow during that time.
Any help welcome.