Re: Instance filesystem corrupt

[Ahmed Mostafa <ahmedmostafadev@xxxxxxxxx>]

Well, for me know i know my issue

It is indeed an over-utilization issue, but bot related to ceph

Th cluster is connected via a 1g interfaces, which basixally gets saturated by all the bandwidth generated from theae instances trying to read their root filesystems and mount it, which is stored in ceph

So that explains why restarting the vm later solvs the problem.

On Friday, 28 October 2016, Ahmed Mostafa <ahmedmostafadev@xxxxxxxxx> wrote:

So i couldn't actually wait till the morning

I sat rbd cache to false and tried to create the same number of instances, but the same issue happened again.

I want to note, that if i rebooted any of the virtual machines that has this issue, it works without any problem afterwards.

Does this mean that over-utilization could be the cause of my problem ? The cluster i have have bad hardware and this is the only logical explanation i can reach .

By bad hardware i mean core-i5 processors for instance, i can see the %wa reaching 50-60% too.

Thank you

On Thu, Oct 27, 2016 at 4:13 PM, Jason Dillaman <jdillama@xxxxxxxxxx> wrote:

The only effect I could see out of a highly overloaded system would be that the OSDs might appear to become unresponsive to the VMs. Are any of you using cache tiering or librbd cache? For the latter, there was one issue [1] that can result in read corruption that affects hammer and prior releases.

[1] http://tracker.ceph.com/issues/16002

On Thu, Oct 27, 2016 at 1:34 AM, Ahmed Mostafa <ahmedmostafadev@xxxxxxxxx> wrote:

This is more or less the same bahaviour i have in ky environment 

By any chance is anyone running their osds and their hypervisors on the same machine ?

And could high workload, like starting 40 - 60 or above virtual machines have an effect on this problem ?

 
On Thursday, 27 October 2016, <Keynes_Lee@xxxxxxxxxxx> wrote:

 

Most of filesystem corrupt causes instances crashed, we saw that after a shutdown / restart   

( triggered by OpenStack portal  buttons or triggered by OS commands in Instances )

 

Some are early-detected, we saw filesystem errors in OS logs on instances.

Then we make a filesystem check ( FSCK / chkdsk ) immediately, issue fixed.

 

	Keynes  Lee    李 俊 賢
	Direct:	+886-2-6612-1025
	Mobile:	+886-9-1882-3787
	Fax:	+886-2-6612-1991
	E-Mail:	keynes_lee@xxxxxxxxxxx

 

 

From: Jason Dillaman [mailto:jdillama@xxxxxxxxxx]
Sent: Wednesday, October 26, 2016 9:38 PM
To: Keynes Lee/WHQ/Wistron <Keynes_Lee@xxxxxxxxxxx>
Cc: Will.Boege@xxxxxxxxxx; ceph-users <ceph-users@xxxxxxxxxxxxxx>
Subject: Re: [EXTERNAL] Instance filesystem corrupt

 

I am not aware of any similar reports against librbd on Firefly. Do you use any configuration overrides? Does the filesystem corruption appears while the instances are running or only after a shutdown / restart of the instance?

 

On Wed, Oct 26, 2016 at 12:46 AM, <Keynes_Lee@xxxxxxxxxxx> wrote:

No , we are using Firefly (0.80.7).

As we are using HPE Helion OpenStack 2.1.5, and what the version is was embedded is Firefly.

 

An upgrade was planning, but should will not happen  soon.

 

 

 

 

 

From: Will.Boege [mailto:Will.Boege@xxxxxxxxxx]
Sent: Wednesday, October 26, 2016 12:03 PM
To: Keynes Lee/WHQ/Wistron <Keynes_Lee@xxxxxxxxxxx>; ceph-users@xxxxxxxxxxxxxx
Subject: Re: [EXTERNAL] Instance filesystem corrupt

 

Just out of curiosity, did you recently upgrade to Jewel?

 

From: ceph-users <ceph-users-bounces@xxxxxxxxxx.com> on behalf of "Keynes_Lee@xxxxxxxxxxx" <Keynes_Lee@xxxxxxxxxxx>
Date: Tuesday, October 25, 2016 at 10:52 PM
To: "ceph-users@xxxxxxxxxxxxxx" <ceph-users@xxxxxxxxxxxxxx>
Subject: [EXTERNAL] Instance filesystem corrupt

 

We are using OpenStack + Ceph.

Recently we found a lot of filesystem corrupt incident on instances.

Some of them are correctable, fixed by fsck, but the others have no luck, just corrupt and can never start up again.

 

We found this issue on vary operation systems of instances. They are

Redhat4 / CentOS 7 / Windows 2012

 

Could someone please advise us some troubleshooting direction ?

 

 

	Keynes  Lee    李 俊 賢
	Direct:	+886-2-6612-1025
	Mobile:	+886-9-1882-3787
	Fax:	+886-2-6612-1991
	E-Mail:	keynes_lee@xxxxxxxxxxx

 

 

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--

Jason

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Jason

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