when we start copy or clone UI become unresponsive

[Chiranjeevi]

Hi
we have installed Proxmox VE 4.4 , RAID 1 10TB, enabled Cache

we need to move the VMs KVM based raw files from other server to Proxmox, so we have copied those VMs to External HDD and connected though USB3.0 and mounted to proxmox server.

we create the VMs though GUI and i start replaceing the VM file by using 'dd' command

when we start doing this. iodelay will start increaseing and after some time GUI is not resposive we can not see CPU usage graph. and access VM and node show red.
Main issue is it will start blocking the KVM, means the VM which is already running will also become very dead slow.

i saw some threads related to this issue. they are asking to make RAID 1 with Cache

here is my pveperf output

pveperf
CPU BOGOMIPS:      302463.72
REGEX/SECOND:      2058739
HD SIZE:           94.37 GB (/dev/dm-0)
BUFFERED READS:    209.37 MB/sec
AVERAGE SEEK TIME: 6.73 ms
FSYNCS/SECOND:     673.57
DNS EXT:           83.98 ms
DNS INT:           0.92 ms

 

[manu]

the huge amount of I/O wait probably makes the storage status unresponsive, and as the storage is unresponsive, we mark the node as red

if you have any doubt check the command 'pvesm status' on the host
if this command does not return in a couple a seconds the node will be marked red
the solution: use SSDs !