Hello Lustre users We have a Lustre setup consisting of 2 Lustre servers exporting 7 OSTs and 1 MGS/MDT. The storage devices are FibreChannel-RAIDs connected through a QLogic SANbox 5602 with the two servers. The servers run the Lustre-patched 2.6.18 Vanilla sources. We use Lustre 1.6.4.3.
On Client side we have about 180 hosts with Lustre patchless Client and Gentoo kernel 2.6.22. We experienced a major problem when accessing many files at a time. Especially a `find` does perform very very slowly in our setup. The 4 core MGS/MDT server has nearly 100% system CPU time and the client nearly the same amount CPU wait time. It's similar when doing a `ls` or deleting files in a directory with thousands of files. I did already search though the list, but couldn't find anything similar. It seems to me like the MGS/MDT is the bottleneck here, but I have no idea about tuning it. The MDT storage is a Transtec 4Gbps FibreChannel SAS Raid. It's configured to use Raid level 1+0. Does anybody have hints, recommendations, experiences to this topic? Kind regards Reto Gantenbein -- Universität Bern Abt. Informatikdienste Gruppe Zentrale Systeme Reto Gantenbein Administrator UBELIX Gesellschaftsstrasse 6 CH-3012 Bern Raum -104 Tel. +41 (0)31 631 87 97 _______________________________________________ Lustre-discuss mailing list [email protected] http://lists.lustre.org/mailman/listinfo/lustre-discuss
