[lustre-discuss] Mount lustre client with MDS/MGS backup

Pardo Diaz, Alfonso alfonso.pardo at ciemat.es
Thu Sep 1 09:43:54 PDT 2016


I am using a combined MDS/MGS. This is my config:

Checking for existing Lustre data: found
Reading CONFIGS/mountdata

   Read previous values:
Target:     fs-MDT0000
Index:      0
Lustre FS:  fs
Mount type: ldiskfs
Flags:      0x1005
              (MDT MGS no_primnode )
Persistent mount opts: user_xattr,errors=remount-ro
Parameters:  failover.node= at o2ib: at o2ib mdt.identity_upcall=NONE

Alfonso Pardo Diaz
System Administrator / Researcher
c/ Sola nº 1; 10200 Trujillo, ESPAÑA
Tel: +34 927 65 93 17 Fax: +34 927 32 32 37

De: Ben Evans [bevans at cray.com]
Enviado el: jueves, 01 de septiembre de 2016 15:25
Para: Pardo Diaz, Alfonso; Mohr Jr, Richard Frank (Rick Mohr)
Cc: lustre-discuss at lists.lustre.org
Asunto: Re: [lustre-discuss] Mount lustre client with MDS/MGS backup

where is the MGS mounted, and now is it configured?

-Ben Evans

On 9/1/16, 2:16 AM, "lustre-discuss on behalf of Pardo Diaz, Alfonso"
<lustre-discuss-bounces at lists.lustre.org on behalf of
alfonso.pardo at ciemat.es> wrote:

>Oppps, damm copy and paste!
>I am writing the correct output with same result. If the MDT is mounted
>in the backup MDS ( the mounted client work OK, but new
>clients throw the next error:
>mount -v -t lustre at o2ib: at o2ib:/fs /mnt/fs
>arg[0] = /sbin/mount.lustre
>arg[1] = -v
>arg[2] = -o
>arg[3] = rw
>arg[4] = at o2ib: at o2ib:/fs
>arg[5] = /mnt/fs
>source = at o2ib: at o2ib:/fs
>( at o2ib: at o2ib:/fs), target = /mnt/fs
>options = rw
>mounting device at o2ib: at o2ib:/fs at /mnt/fs,
>flags=0x1000000 options=device= at o2ib: at o2ib:/fs
>mount.lustre: mount at o2ib: at o2ib:/fs at /mnt/fs
>failed: Input/output error retries left: 0
>mount.lustre: mount at o2ib: at o2ib:/fs at /mnt/fs
>failed: Input/output error
>Is the MGS running?
>> El 31 ago 2016, a las 15:32, Mohr Jr, Richard Frank (Rick Mohr)
>><rmohr at utk.edu> escribió:
>>> On Aug 31, 2016, at 8:12 AM, Pardo Diaz, Alfonso
>>><alfonso.pardo at ciemat.es> wrote:
>>> I mount my clients: mount -t lustre mds1 at o2ib:mds2 at o2ib:/fs /mnt/fs
>>> 1) When both MDS are OK I can mount without problems
>>> 2) If the MDS1 is down and my clients have lustre mounted, they use
>>>MDS2 without problems
>>> 3) If the MDS1 is down and I try to mount a new client, It can¹t mount
>>>lustre with the next error:
>> <snip>
>>> arg[4] = at o2ib: at o2ib:/fs
>> The client is resolving both hostnames (mds1 and mds2) to the same IP
>>address.  I am guessing that this corresponds to mds1, so when it is
>>down, there is no second host for the client to try.  Try specifying IP
>>addresses instead of hostnames and see if that make a difference.
>> --
>> Rick Mohr
>> Senior HPC System Administrator
>> National Institute for Computational Sciences
>> http://www.nics.tennessee.edu
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>lustre-discuss at lists.lustre.org

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