All, I have a lustre filesystem with an unregistered OST:
[root@submit-0 ~]# lfs df UUID 1K-blocks Used Available Use% Mounted on WORK-MDT0000_UUID 393147136 15389780 350856224 4% /work[MDT:0] WORK-OST0000_UUID 17170063404 8058677632 8236276288 49% /work[OST:0] WORK-OST0001_UUID 15619171724 10586931900 5022400004 68% /work[OST:1] WORK-OST0002_UUID 15619171724 10665764164 4163865152 72% /work[OST:2] WORK-OST0003_UUID 15619171724 10918155860 3911965996 74% /work[OST:3] WORK-OST0004_UUID 7809493364 6952521872 465368976 94% /work[OST:4] OST0005 : Resource temporarily unavailable WORK-OST0006_UUID 7809493364 6998187284 731734676 91% /work[OST:6] WORK-OST0007_UUID 7809493364 7069544608 660517748 91% /work[OST:7] WORK-OST0008_UUID 7809493364 6925302272 804469140 90% /work[OST:8] WORK-OST0009_UUID 7809493364 6969095244 760770748 90% /work[OST:9] WORK-OST000a_UUID 7809493364 6861984936 867665884 89% /work[OST:10] WORK-OST000b_UUID 7809493364 6829602016 899989432 88% /work[OST:11] WORK-OST000c_UUID 7809493364 6887468640 842232976 89% /work[OST:12] WORK-OST000d_UUID 7809493364 6950260396 779567540 90% /work[OST:13] WORK-OST000e_UUID 17170063404 3780405388 13192036608 22% /work[OST:14] WORK-OST000f_UUID 17170063404 1129149016 15838115900 7% /work[OST:15] WORK-OST0010_UUID 17170063404 1114116516 15853122088 7% /work[OST:16] WORK-OST0011_UUID 17170063404 876476892 16090299340 5% /work[OST:17] filesystem summary: 202993272468 109573644636 89120398496 55% /work Now when someone connects and does an 'ls' that involves a file/directory that has parts on the missing OST, the CPU starts climbing until it is WAY high (eg: 171.51). I see many process: ldlm_bl_xx where xx is a number. Each of those are eating 100% CPU. What is happening and how to I prevent this? The OST cannot be registered for other problems we are looking into. If I do attempt register it, I get the same (and worse) behavior. Since it is not registered, it does not exist in /proc/fs/lustre/* so I cannot make/change any settings there. Brian Andrus ITACS/Research Computing Naval Postgraduate School Monterey, California voice: 831-656-6238
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