Write speed in QEMU-KVM?

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unlik2015-03-23 18:10:05

Debian

unlik, 2015-03-23 18:10:05

The speed of writing to a hard disk is 15-30 Mb/s.
While the disk itself is 130-150.
What could be the problem?

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5 answer(s)

R

Rainbird, 2015-03-23
@Rainberd

In disk config try
but it's more dangerous on crashes

V

Vadim Galtsev, 2015-03-23
@Leo698

You didn't write how you measure. More details.

A

Armenian Radio, 2015-03-23
@gbg

Try Xen. In paravirtualized mode, even Windows (if there are paravirtualized drivers) under it gives about 8 gigabits over the network and a couple of gigabits over the disk.

V

Vadim Sabynich, 2015-03-23
@vadim_s_sabinich

what is the storage format used for virtual machines?
Somehow conducted a performance comparison. Description and results can be read here: en.5.ispdoc.com/index.php/%D0%A1%D1%80%D0%B0%D0%B2...

H

Harbid Abu Marhamedoff, 2015-04-03
@harbid

I had a performance drop of 8 ... 10%. Tried to use ext4 on a single screw, specified the /dev/md1 device as the disk carrier - there is no difference. Using software raid 1 gives an increase in read speed, write speed is similar to a single screw.