| 1 |
Am 11.06.2014 12:41, schrieb thegeezer: |
| 2 |
|
| 3 |
>> everything around 380 MB/s ... only ~350 MB/s for |
| 4 |
>> /dev/vg01/winserver_disk0 (which still is nice) |
| 5 |
> |
| 6 |
> |
| 7 |
> OK here is the clue. |
| 8 |
> if the LVs are also showing such fast speed, then please can you show |
| 9 |
> your command that you are trying to run that is so slow ? |
| 10 |
|
| 11 |
I originally noticed that virt-backup was slow so I looked into it and |
| 12 |
found some dd-command. |
| 13 |
|
| 14 |
My tests right now are like this: |
| 15 |
|
| 16 |
|
| 17 |
|
| 18 |
booze ~ # dd if=/dev/vg01/winserver_disk0 bs=1M of=/dev/null |
| 19 |
^C25+0 Datensätze ein |
| 20 |
24+0 Datensätze aus |
| 21 |
25165824 Bytes (25 MB) kopiert, 13,8039 s, 1,8 MB/s |
| 22 |
|
| 23 |
booze ~ # dd if=/dev/vg01/winserver_disk0 bs=4M of=/dev/null |
| 24 |
^C6+0 Datensätze ein |
| 25 |
5+0 Datensätze aus |
| 26 |
20971520 Bytes (21 MB) kopiert, 12,5837 s, 1,7 MB/s |
| 27 |
|
| 28 |
booze ~ # dd if=/dev/vg01/winserver_disk0 of=/dev/null |
| 29 |
^C55009+0 Datensätze ein |
| 30 |
55008+0 Datensätze aus |
| 31 |
28164096 Bytes (28 MB) kopiert, 12,611 s, 2,2 MB/s |
| 32 |
|
| 33 |
So no "copy from-to same disk here" ... should be just plain reading, right? |
| 34 |
|
| 35 |
virt-backup does some ionice-stuff as well, but as you see, my |
| 36 |
test-commands don't. |
| 37 |
|
| 38 |
# cat /sys/block/sdc/queue/scheduler |
| 39 |
[noop] deadline cfq |
| 40 |
|
| 41 |
-> noop scheduler to let the controller do its own scheduling |
| 42 |
|
| 43 |
|
| 44 |
|
| 45 |
thanks, Stefan |
Archives