[PVE-User] VM issue when Backup over NAS,

Martin Maurer martin at proxmox.com
Wed Jun 15 18:56:11 CEST 2011


As far as I remember it´s the percentage of time that the CPU was idle during which the system had an outstanding disk I/O request.

So if it is high, your disk subsystem is too slow => use faster disks with a hardware raid controller to get it better.

Martin


From: Muhammad Yousuf Khan [mailto:sirtcp at gmail.com]
Sent: Mittwoch, 15. Juni 2011 18:08
To: Martin Maurer
Cc: pve-user at pve.proxmox.com
Subject: Re: [PVE-User] VM issue when Backup over NAS,

ok Thanks Martin it is resolved. initially IOdelay shoots to 60 precent but gradually it decreases and in a mint or two it reaches 20%  and things got fine. Thank anyways. can you please tell me one more thing what is this IO delay . it is a IO of HD ,Processor or LAN card or mixture of all together ?

Thanks

Myk



On Wed, Jun 15, 2011 at 3:03 PM, Muhammad Yousuf Khan <sirtcp at gmail.com<mailto:sirtcp at gmail.com>> wrote:
ok ill do that an will let you know the update.



On Wed, Jun 15, 2011 at 1:09 PM, Martin Maurer <martin at proxmox.com<mailto:martin at proxmox.com>> wrote:
Based on your hardware the performance is as low as expected. You can limit the speed of vzdump.

Create the /etc/vzdump.conf file with the following content:

bwlimit: 5000

for details, see 'man vzdump'

Martin

From: Muhammad Yousuf Khan [mailto:sirtcp at gmail.com<mailto:sirtcp at gmail.com>]
Sent: Dienstag, 14. Juni 2011 17:31

To: Martin Maurer
Cc: pve-user at pve.proxmox.com<mailto:pve-user at pve.proxmox.com>
Subject: Re: [PVE-User] VM issue when Backup over NAS,

Just FYI
the IOdelay problem is only with the machine that i terminated the vzdump(backup job) during the test backup. other seems to b working fine.

Tthanks



On Tue, Jun 14, 2011 at 8:21 PM, Muhammad Yousuf Khan <sirtcp at gmail.com<mailto:sirtcp at gmail.com>> wrote:


Proxmox

Openfiler

Processors

2.66 Quad Core

P4 3.0 Server board

LAN

8GB

4GB

HD

1TB

250 GB

RAID

No

No

RAM

1GB

1GB



On Tue, Jun 14, 2011 at 7:56 PM, Martin Maurer <martin at proxmox.com<mailto:martin at proxmox.com>> wrote:
Pls provide all information about your boxes like requested below.
Martin

From: Muhammad Yousuf Khan [mailto:sirtcp at gmail.com<mailto:sirtcp at gmail.com>]
Sent: Dienstag, 14. Juni 2011 16:25
To: Martin Maurer
Cc: pve-user at pve.proxmox.com<mailto:pve-user at pve.proxmox.com>
Subject: Re: [PVE-User] VM issue when Backup over NAS,

here you go

CPU BOGOMIPS:      21332.18
REGEX/SECOND:      521349
HD SIZE:           94.49 GB (/dev/mapper/pve-root)
BUFFERED READS:    25.19 MB/sec
AVERAGE SEEK TIME: 32.31 ms
FSYNCS/SECOND:     3.24
DNS EXT:           303.86 ms
DNS INT:           320.81 ms (com)

please tell me what is the ideal approach for controlling the IO delay , ISCSI or local Storage.
right now IO delay is b/w 35 to 50 percent. how can i see the per VM IO so i can manually check what is going on inside rather checking every single VM one by one


On Tue, Jun 14, 2011 at 6:30 PM, Martin Maurer <martin at proxmox.com<mailto:martin at proxmox.com>> wrote:
Looks like your storage/network is overloaded. Try reducing the vzdump bandwith (see 'man vzdump').

Also post the output of 'pveperf' from your Proxmox VE host and give details about the used storage/raid hardware (Proxmox VE host and Openfiler).

Martin

From: pve-user-bounces at pve.proxmox.com<mailto:pve-user-bounces at pve.proxmox.com> [mailto:pve-user-bounces at pve.proxmox.com<mailto:pve-user-bounces at pve.proxmox.com>] On Behalf Of Muhammad Yousuf Khan
Sent: Dienstag, 14. Juni 2011 13:49
To: pve-user at pve.proxmox.com<mailto:pve-user at pve.proxmox.com>
Subject: [PVE-User] VM issue when Backup over NAS,

Openfiler : 2.99
NAS LAN : 1GB (through put is 25% i don't know why, at least acceptable)
RAM :4gb

Proxmox : 1.8
Quadcore : 2.66
Ram : 8GB
Proxmox LAN : 1G

I am using Openfiler as a NAS box. and using NFS and ISCSI both as a storage medium. but i have noticed one thing when i backup a VM on NFS and also copy a huge file inside Running VM which is hosted on ISCSI on same openfiler box. My VM get stuck. i can move the copy window in running VM but can not close task bar or copy window. until the backup task of a VM gets finishes then copy inside VM continue and VM gets usable.

how can i over come that issue. for instance if i run backup backup of my data which is inside VM it will again HANG and thing may unavailable to users during backup which is not an option
any help?


Thanks you
MYK

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