[lustre-discuss] mdt mounting error

[Parag Khuraswar]

I have two mds nodes. For HA purpose I mentioned –service node options

 

mkfs.lustre --servicenode=10.2.1.204 at o2ib --servicenode=10.2.1.205 at o2ib --mgs /dev/mapper/mpathc

 

Do I have to mention mgt in command ?

 

How many mgt’s we can have on one mds or mgs servers ?

 

Regards,

Parag

 

 

From: lustre-discuss [mailto:lustre-discuss-bounces at lists.lustre.org] On Behalf Of Brian Andrus
Sent: Thursday, November , 2017 7:30 AM
To: lustre-discuss at lists.lustre.org
Subject: Re: [lustre-discuss] mdt mounting error

 

I don't think you use the --servicenode option when formatting an mgs-only disk, or the --fsname option. Neither of those apply for an mgs-only with multiple filesystems.

My command for a zfs backed mgs was:

mkfs.lustre --mgs --backfstype=zfs MGT/mgt

Then I created 2 different sets of OSTs/MDTs with different fsnames, but the same mgsnode.

Brian Andrus

 

On 11/1/2017 6:50 PM, Parag Khuraswar wrote:

Hi Raj,

 

But I have two file system. And I think one mgt can be used for two filesystems. Correct me if I am wrong.

 

Regards,

Parag

 

 

From: Raj [mailto:rajgautam at gmail.com] 
Sent: Wednesday, November , 2017 4:57 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

The following can contribute to this issue:

- Missing FS name in mgt creation (it must be <=9 character long): --fsname=

mkfs.lustre --servicenode=10.2.1.204 at o2ib --servicenode=10.2.1.205 at o2ib --fsname=home --mgs /dev/mapper/mpathc

 

- verify if /mdt directory exists

 

 

 

On Wed, Nov 1, 2017 at 6:16 AM Raj <rajgautam at gmail.com> wrote:

What options in mkfs.lustre did you use to format with lustre?

On Wed, Nov 1, 2017 at 6:14 AM Parag Khuraswar <parag_k at citilindia.com> wrote:

Hi Raj,

 

Yes, /dev/mapper/mpatha available. 

I could format and mount using ext4.

 

Regards,

Parag

 

 

From: Raj [mailto:rajgautam at gmail.com] 
Sent: Wednesday, November , 2017 4:39 PM
To: Parag Khuraswar; Lustre discussion
Subject: Re: [lustre-discuss] mdt mounting error

 

Parag, 
Is the device /dev/mapper/mpatha available? 
If not, the multipathd may not have started or the multipath configuration may not be correct. 

On Wed, Nov 1, 2017 at 5:18 AM Parag Khuraswar <parag_k at citilindia.com> wrote:

Hi,

 

I am getting below error while mounting mdt. Mgt is mounted. 

 

Please suggest

 

[root at mds2 ~]# mount -t lustre /dev/mapper/mpatha /mdt

mount.lustre: mount /dev/mapper/mpatha at /mdt failed: No such file or directory

Is the MGS specification correct?

Is the filesystem name correct?

If upgrading, is the copied client log valid? (see upgrade docs)

 

Regards,

Parag

 

 

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