[lustre-discuss] tune2fs being blocked by MMP

Gibbins, Faye Faye.Gibbins at cirrus.com
Thu Aug 11 02:59:08 PDT 2016


 So we have three lustre nodes ATM, say A, B and C. The MSG+OSS and two additional ones which are OSS's too.

 In this case we have an LVM called /dev/mapper/audiodb--1--5-audiodb_0 which is one part of many ext4 file systems that make up the whole audiodb file system under Lustre.

I've checked all three machines and confirmed that only host A mounts that LVM, however all three can see the LVM as we are multi-pathing the fibre to the backend storage.

On host A I can run "tune2fs -l /dev/mapper/audiodb--1--5-audiodb_0" just fine. But when I try to run "tune2fs -e panic /dev/mapper/audiodb--1--5-audiodb_0" this happens:

0 A:~# tune2fs -e panic /dev/mapper/audiodb--1--5-audiodb_0
tune2fs 1.42.13.wc4 (28-Nov-2015)
tune2fs: MMP: device currently active while trying to open /dev/mapper/audiodb--1--5-audiodb_0
MMP error info: last update: Thu Aug 11 10:55:48 2016
 node: A device: dm-20
0 A:~#

Can anyone help with this?


PS Hostnames changed.

-----Original Message-----
From: COUVEE, PHILIPPE [mailto:philippe.couvee at atos.net] 
Sent: 04 August 2016 14:56
To: Gibbins, Faye <Faye.Gibbins at cirrus.com>; Mohr Jr, Richard Frank (Rick Mohr) <rmohr at utk.edu>
Cc: lustre-discuss at lists.lustre.org
Subject: RE: [lustre-discuss] tune2fs being blocked by MMP

If I'm not wrong, MMP stands for Multiple Mount Protection, and is activated to prevent mounting a device that is already mounted on another node in an HA cell.
In your case, are you trying to issue the tunefs command on the "backup" node for that device ? What if you try running tunefs on the OSS where the device is currently mounted ?

-----Original Message-----
From: lustre-discuss [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Gibbins, Faye
Sent: Thursday, August 04, 2016 3:40 PM
To: Mohr Jr, Richard Frank (Rick Mohr)
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] tune2fs being blocked by MMP


 Yes it is mounted. But that's not always a problem. We have a test lustre cluster where it's mounted and the tune2fs works fine. But it fails in production.

 Production have failover turned on for the OSTs. Something absent on that particular test cluster.

 Is it possible there's something in lustre that prohibits tune2fs working only when failover is on for an OST?


-----Original Message-----
From: Mohr Jr, Richard Frank (Rick Mohr) [mailto:rmohr at utk.edu]
Sent: 02 August 2016 17:38
To: Gibbins, Faye <Faye.Gibbins at cirrus.com>
Cc: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] tune2fs being blocked by MMP

> On Aug 2, 2016, at 10:38 AM, Gibbins, Faye <Faye.Gibbins at cirrus.com> wrote:
> tune2fs: MMP: device currently active while trying to open 
> /dev/mapper/scratch--1--5-scratch_3
> MMP error info: last update: Tue Aug  2 15:34:09 2016
> node: edi-vf-1-5.ad.cirrus.com device: dm-19
> 0 edi-vf-1-5:~#

Is the device currently mounted?  If so, that would explain the error.

Rick Mohr
Senior HPC System Administrator
National Institute for Computational Sciences https://urldefense.proofpoint.com/v2/url?u=http-3A__www.nics.tennessee.edu&d=DQIFAg&c=O3LcjD-V2Iepl5V0N1424A&r=zYKOt5zq8DxD76qBilrgQKxtITGPmVmWHHVOs6JpkMQ&m=HHqIHO6NJdOqJbinMrvMmk8S9oklNJRSgMNfnTOJLVk&s=9Ntf1l5dP_4JpRf-8OjiWKFFzwoJ5BP7VC-uNgSLF3k&e=

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