Hello<br><br>System: Two brand new Dell 1950 servers with dual Intel Quadcore Xeon connected to an EMC CX3-20 SAN. Running CentOS 5 x86_64 - both with kernel 2.6.18-8.1.6-el5 x86_64.<br><br>I just noticed a panic on one of the servers:
<br><br>Jul 2 04:08:52 megasrv2 kernel: (3568,2):dlm_drop_lockres_ref:2289 ERROR: while dropping ref on 87B24E40651A4C7C858EF03ED6F3595F:M00000000000000021af916b7dfbde4 (master=0) got -22.<br>Jul 2 04:08:52 megasrv2 kernel: (3568,2):dlm_print_one_lock_resource:294 lockres: M00000000000000021af916b7dfbde4, owner=0, state=64
<br>Jul 2 04:08:52 megasrv2 kernel: (3568,2):__dlm_print_one_lock_resource:309 lockres: M00000000000000021af916b7dfbde4, owner=0, state=64<br>Jul 2 04:08:52 megasrv2 kernel: (3568,2):__dlm_print_one_lock_resource:311 last used: 4747810336, on purge list: yes
<br>Jul 2 04:08:52 megasrv2 kernel: (3568,2):dlm_print_lockres_refmap:277 refmap nodes: [ ], inflight=0<br>Jul 2 04:08:52 megasrv2 kernel: (3568,2):__dlm_print_one_lock_resource:313 granted queue: <br>Jul 2 04:08:52 megasrv2 kernel: (3568,2):__dlm_print_one_lock_resource:328 converting queue:
<br>Jul 2 04:08:52 megasrv2 kernel: (3568,2):__dlm_print_one_lock_resource:343 blocked queue: <br>Jul 2 04:08:52 megasrv2 kernel: ----------- [cut here ] --------- [please bite here ] ---------<br><br>After booting the server I'm getting a lot of the following messages:
<br><br>Jul 5 11:09:54 megasrv2 kernel: Additional sense: Logical unit not ready, manual intervention required<br>Jul 5 11:09:54 megasrv2 kernel: end_request: I/O error, dev sdd, sector 0<br>Jul 5 11:09:54 megasrv2 kernel: Buffer I/O error on device sdd, logical block 0
<br>Jul 5 11:09:54 megasrv2 kernel: sd 1:0:0:2: Device not ready: <6>: Current: sense key: Not Ready<br><br>But I guess this one has something to do with EMC PowerPath as sdd is not a valid device. And there is no PowerPath for use with RHEL5 yet...
<br><br>I'm sorry I haven't had the time to investigate this much. But right now I have no clue what caused this panic, or if it will happen again...<br>