Ron
2008-Aug-14 21:29 UTC
[Lustre-discuss] mounting an OST from another node attached to a fibre channel switch
Hi, We have set up a couple of test systems where the OSTs are mounted on the same node as the MDT. The OSTs are LUNS on a SATA Beast controller accessible from multiple systems attached to a fibre channel switch,. We would like to umount an OST from the MDT system and mount it on another system. We''ve tried doing this and even though there is network traffic between the new system and the mds system, the mds system seems to be ignoring the OST mount. Can the an OSTs OSS change? Thanks, Ron
Klaus Steden
2008-Aug-14 21:33 UTC
[Lustre-discuss] mounting an OST from another node attached to a fibre channel switch
Yes. There is an entry in the manual on this topic. You''ll have to stop Lustre and update the MGS configuration, but it''s a pretty quick operation. cheers, Klaus On 8/14/08 2:29 PM, "Ron" <ron.rex at gmail.com>did etch on stone tablets:> Hi, > We have set up a couple of test systems where the OSTs are mounted on > the same node as the MDT. The OSTs are LUNS on a SATA Beast > controller accessible from multiple systems attached to a fibre > channel switch,. We would like to umount an OST from the MDT system > and mount it on another system. We''ve tried doing this and even though > there is network traffic between the new system and the mds system, > the mds system seems to be ignoring the OST mount. Can the an OSTs > OSS change? > Thanks, > Ron > _______________________________________________ > Lustre-discuss mailing list > Lustre-discuss at lists.lustre.org > http://lists.lustre.org/mailman/listinfo/lustre-discuss
Ron
2008-Aug-15 21:18 UTC
[Lustre-discuss] mounting an OST from another node attached to a fibre channel switch
Which section of which manual? Please. I.e are you talking about: Part No. 820-3681-10 Lustre manual version: Lustre_1.6_man_v1.10 December 2007 4.2.3.2 Running the Writeconf Command and/or 4.2.3.3 Changing a Server NID Our MGS is not changing nodes, but the OSTs are. Is there really just one simple MGS only operation? Those sections do not quite fit (to my way of thinking, which is in the process of being adjusted :} Thanks, Ron On Aug 14, 4:33 pm, Klaus Steden <klaus.ste... at thomson.net> wrote:> Yes. There is an entry in the manual on this topic. You''ll have to stop > Lustre and update the MGS configuration, but it''s a pretty quick operation. > > cheers, > Klaus > > On 8/14/08 2:29 PM, "Ron" <ron.... at gmail.com>did etch on stone tablets: > > > Hi, > > We have set up a couple of test systems where the OSTs are mounted on > > the same node as the MDT. The OSTs are LUNS on a SATA Beast > > controller accessible from multiple systems attached to a fibre > > channel switch,. We would like to umount an OST from the MDT system > > and mount it on another system. We''ve tried doing this and even though > > there is network traffic between the new system and the mds system, > > the mds system seems to be ignoring the OST mount. Can the an OSTs > > OSS change? > > Thanks, > > Ron > > _______________________________________________ > > Lustre-discuss mailing list > > Lustre-disc... at lists.lustre.org > >http://lists.lustre.org/mailman/listinfo/lustre-discuss > > _______________________________________________ > Lustre-discuss mailing list > Lustre-disc... at lists.lustre.orghttp://lists.lustre.org/mailman/listinfo/lustre-discuss
Klaus Steden
2008-Aug-15 22:16 UTC
[Lustre-discuss] mounting an OST from another node attached to a fibre channel switch
Yes. The MGS contains all the configuration information for the file system it serves, including the locations and network paths for all the MDS and OSS nodes within the file system. What you want to do is tell the MGS that your OSS(es) have been moved to new addresses and have it update its records. At that point, your file system will be usable in the new configuration. hth, Klaus On 8/15/08 2:18 PM, "Ron" <ron.rex at gmail.com>did etch on stone tablets:> Which section of which manual? Please. I.e are you talking about: > Part No. 820-3681-10 > Lustre manual version: Lustre_1.6_man_v1.10 > December 2007 > > 4.2.3.2 Running the Writeconf Command > and/or 4.2.3.3 Changing a Server NID > > Our MGS is not changing nodes, but the OSTs are. > Is there really just one simple MGS only operation? > Those sections do not quite fit (to my way of thinking, which is > in the process of being adjusted :} > > Thanks, > Ron > > On Aug 14, 4:33 pm, Klaus Steden <klaus.ste... at thomson.net> wrote: >> Yes. There is an entry in the manual on this topic. You''ll have to stop >> Lustre and update the MGS configuration, but it''s a pretty quick operation. >> >> cheers, >> Klaus >> >> On 8/14/08 2:29 PM, "Ron" <ron.... at gmail.com>did etch on stone tablets: >> >>> Hi, >>> We have set up a couple of test systems where the OSTs are mounted on >>> the same node as the MDT. The OSTs are LUNS on a SATA Beast >>> controller accessible from multiple systems attached to a fibre >>> channel switch,. We would like to umount an OST from the MDT system >>> and mount it on another system. We''ve tried doing this and even though >>> there is network traffic between the new system and the mds system, >>> the mds system seems to be ignoring the OST mount. Can the an OSTs >>> OSS change? >>> Thanks, >>> Ron >>> _______________________________________________ >>> Lustre-discuss mailing list >>> Lustre-disc... at lists.lustre.org >>> http://lists.lustre.org/mailman/listinfo/lustre-discuss >> >> _______________________________________________ >> Lustre-discuss mailing list >> Lustre-disc... at lists.lustre.orghttp://lists.lustre.org/mailman/listinfo/lustr >> e-discuss > _______________________________________________ > Lustre-discuss mailing list > Lustre-discuss at lists.lustre.org > http://lists.lustre.org/mailman/listinfo/lustre-discuss