Hi, I'm seeing what appears to be LU-4397<https://jira.hpdd.intel.com/browse/LU-4397> on a newly installed Lustre 2.8.0 (CentOS 7) system. I disabled an OST on the MGS using lctl conf_param data-OST0001.osc.active=0, and the clients can mount and use the file system, however df on the clients hangs for about 100s before returning the results. Setting lazystatfs using lctl conf_param data.llite.lazystatfs=1 resolves the issue.
Interestingly, CentOS 6 clients don't have this issue, only CentOS 7 clients. Also of note, CentOS 6 clients show the OST as Inactive, but the CentOS 7 clients don't (note data-OST0001 in these two listings). [root@x92 ~]# lctl dl 0 UP mgc MGC10.1.0.200@o2ib 1a4b524d-6171-72a0-670b-58524f5135c9 5 1 UP lov data-clilov-ffff8804bcaafc00 a4e753f1-6495-dfe9-d854-8d3e7305b6e8 4 2 UP lmv data-clilmv-ffff8804bcaafc00 a4e753f1-6495-dfe9-d854-8d3e7305b6e8 4 3 UP mdc data-MDT0000-mdc-ffff8804bcaafc00 a4e753f1-6495-dfe9-d854-8d3e7305b6e8 5 4 UP osc data-OST0005-osc-ffff8804bcaafc00 a4e753f1-6495-dfe9-d854-8d3e7305b6e8 5 5 UP osc data-OST0002-osc-ffff8804bcaafc00 a4e753f1-6495-dfe9-d854-8d3e7305b6e8 5 6 UP osc data-OST0004-osc-ffff8804bcaafc00 a4e753f1-6495-dfe9-d854-8d3e7305b6e8 5 7 UP osc data-OST0003-osc-ffff8804bcaafc00 a4e753f1-6495-dfe9-d854-8d3e7305b6e8 5 8 IN osc data-OST0001-osc-ffff8804bcaafc00 a4e753f1-6495-dfe9-d854-8d3e7305b6e8 5 [root@x87 ~]# lctl dl 0 UP mgc MGC10.1.0.200@o2ib e5ab9926-ffa3-2c47-3851-e480303a42cc 5 1 UP lov data-clilov-ffff88031ef85000 213b8ef0-18f9-b7d7-7c43-c8dfb333a11f 4 2 UP lmv data-clilmv-ffff88031ef85000 213b8ef0-18f9-b7d7-7c43-c8dfb333a11f 4 3 UP mdc data-MDT0000-mdc-ffff88031ef85000 213b8ef0-18f9-b7d7-7c43-c8dfb333a11f 5 4 UP osc data-OST0005-osc-ffff88031ef85000 213b8ef0-18f9-b7d7-7c43-c8dfb333a11f 5 5 UP osc data-OST0002-osc-ffff88031ef85000 213b8ef0-18f9-b7d7-7c43-c8dfb333a11f 5 6 UP osc data-OST0004-osc-ffff88031ef85000 213b8ef0-18f9-b7d7-7c43-c8dfb333a11f 5 7 UP osc data-OST0003-osc-ffff88031ef85000 213b8ef0-18f9-b7d7-7c43-c8dfb333a11f 5 8 UP osc data-OST0001-osc-ffff88031ef85000 213b8ef0-18f9-b7d7-7c43-c8dfb333a11f 4 Ron Jerome Team Leader, Infrastructure/Operations Supercomputing Directorate Shared Services Canada / Government of Canada
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