Andreas Dilger
2006-May-19 07:36 UTC
[Lustre-discuss] Re: including extra ost''s for future use
--24zk1gE8NUlDmwG9 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Jun 22, 2005 11:56 -0600, Ruth Klundt wrote:> I''d like to format a large number of OSS nodes, and include only a=20 > subset of them when the MDS is brought up. >=20 > Do I need to do lconf --write-conf for the MDS each time the subset of=20 > OST''s changes ( either larger or smaller )?Yes, without this (a) the MDS won''t connect to them and (b) neither will the clients.> Can the MDS be made to ignore OSS nodes that are down and/or OST''s not=20 > present for whatever reason, even when they appear in the config.xml?It can if they fail during operation, or if they are manually deactivated, but not otherwise. Note that the OSTs need to be present at MDS startup. What seems to be the best solution for now is if you include all of the OSTs into the initial config, but during your MDS startup process you should run "lctl --device %{OST_NAME} deactivate". That will prevent the MDS from allocating any objects on these OSTs, and the clients will also ignore them as a result. Cheers, Andreas -- Andreas Dilger Principal Software Engineer Cluster File Systems, Inc. --24zk1gE8NUlDmwG9 Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) iD8DBQFCua3gpIg59Q01vtYRAjJCAKC/tbZsvK8hx141S5/T38O0VJAYfwCgjFIU F/WZOq2Hi8RKQu/aJiWBP+U=Y1FN -----END PGP SIGNATURE----- --24zk1gE8NUlDmwG9--
Hi, I''d like to format a large number of OSS nodes, and include only a subset of them when the MDS is brought up. Do I need to do lconf --write-conf for the MDS each time the subset of OST''s changes ( either larger or smaller )? Can the MDS be made to ignore OSS nodes that are down and/or OST''s not present for whatever reason, even when they appear in the config.xml? Thanks, Ruth Klundt