In our lab, we've never had a problem with simply having 1 MGS per filesystem. Mountpoints will be unique for all of them, but functionally it works just fine.
-Ben Evans -----Original Message----- From: [email protected] on behalf of Thomas Roth Sent: Fri 1/21/2011 6:43 AM To: [email protected] Subject: [Lustre-discuss] MDT raid parameters, multiple MGSes Hi all, we have gotten new MDS hardware, and I've got two questions: What are the recommendations for the RAID configuration and formatting options? I was following the recent discussion about these aspects on an OST: chunk size, strip size, stride-size, stripe-width etc. in the light of the 1MB chunks of Lustre ... So what about the MDT? I will have a RAID 10 that consists of 11 RAID-1 pairs striped over. giving me roughly 3TB of space. What would be the correct value for <insert your favorite term>, the amount of data written to one disk before proceeding to the next disk? Secondly, it is not yet decided whether we wouldn't use this hardware to set up a second Lustre cluster. The manual recommends to have only one MGS per site, but doesn't elaborate: what would be the drawback of having two MGSes, two different network addresses the clients have to connect to to mount the Lustres? I know that it didn't work in Lustre 1.6.3 ;-) and there are no apparent issues when connecting a Lustre client to a test cluster now (version 1.8.4), but what about production? Cheers, Thomas _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
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