[lustre-discuss] mdt mounting error

[Brian Andrus]

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 
> <mailto:--servicenode=10.2.1.204 at o2ib> --servicenode=10.2.1.205 at o2ib 
> <mailto:--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 
> <mailto: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 <mailto: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
>         <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 <mailto: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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>
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