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8efb0d2
2012 Aug 06
0
Problem with mdadm + lvm + drbd + ocfs ( sounds obvious, eh ? :) )
Hi there
First of all apologies for the lenghty message, but it's been a long weekend.
I'm trying to setup a two node cluster with the following configuration:
OS: Debian 6.0 amd64
ocfs: 1.4.4-3 ( debian package )
drbd: 8.3.7-2.1
lvm2: 2.02.66-5
kernel: 2.6.32-45
mdadm: 3.1.4-1+8efb9d1+squeeze1
layout:
0- 2 36GB scsi disks in a raid1 array , with mdadm.
1- 1 lvm2 VG above the raid1 , 4 LV from it, one of them being
'/dev/mapper/vg-lv_opt' , our target .
2- drbd on top of the lvm2 VG : configured as below:
----
resource opt {
device /dev/drbd0 ;
disk...
2014 Jul 24
0
SLOW I/O performance
...write speed test (performed with hdtune)
shows 4 MB/s
And in short disk read perfomance comparing host to guest systems is
reduced for about 10 times.
Can anybody please explain why disk write/read speed is reduced so much
with Xen?
Installes Packages:
mdadm 3.1.4-1+8efb9d1+squeeze1
lvm2 2.02.66-5
libxenstore3.0 4.0.1-4
linux-image-2.6.32-5-xen-amd64 2.6.32-48squeeze3
xen-hypervisor-4.0-amd64 4.0.1-4
xen-linux-system-2.6-xen-amd64 2.6.32+29
xen-linux-system-2.6.32-5-xen-amd64 2.6.32-48squeeze3
xe...