I am wondering if anyone has experienced issues with md / mdadm in the 1.8.7-wc1 patched server kernels.? we have historically used software raid on our OSS machines because it provided a 20-30% throughput in our hands, over raid provided from our storage arrays (coraid ATA over ethernet shelves). In 1.8.5 this has worked more or less flawlessly, but we now have new storage, with 3Tb rather than 2Tb disks and new servers with 1.8.7-wc1 patched kernels.
md is unable to reliably shut down and restart arrays after the machines have been rebooted (cleanly) - the disks are no longer recognized as part of the arrays they were created within. In the kernel log we have seen the following messages below, which include the following: md: bug in file drivers/md/md.c, line 1677 looking through the mdadm changelogs, it seems like there are some possible patches for md in 2.6.18 kernels but I cannot tell if they are applied here, or whether this is even relevant. I am not clear whether this is an issue with 3Tb disks, or something else related to mdadm and the patched server kernel. My suspicion is that something has broken with > 2.2Tb disks. Does anyone have any ideas about this? thanks sam aparicio --------------- Mar 19 21:34:48 OST3 kernel: md: ********************************** Mar 19 21:34:48 OST3 kernel: Mar 19 21:35:20 OST3 kernel: md: bug in file drivers/md/md.c, line 1677 Mar 19 21:35:20 OST3 kernel: Mar 19 21:35:20 OST3 kernel: md: ********************************** Mar 19 21:35:20 OST3 kernel: md: * <COMPLETE RAID STATE PRINTOUT> * Mar 19 21:35:20 OST3 kernel: md: ********************************** Mar 19 21:35:20 OST3 kernel: md142: Mar 19 21:35:20 OST3 kernel: md141: Mar 19 21:35:20 OST3 kernel: md140: <etherd/e14.16><etherd/e14.15><etherd/e14.14><etherd/e14.13><etherd/e14.12><etherd/e14.11><etherd/e14.10><etherd/e14.9><etherd/e14.8><etherd/e14.7><etherd/e14.6><etherd /e14.5><etherd/e14.4><etherd/e14.3><etherd/e14.2><etherd/e14.1><etherd/e14.0> Mar 19 21:35:20 OST3 kernel: md: rdev etherd/e14.16, SZ:2930265344 F:0 S:0 DN:16 Mar 19 21:35:20 OST3 kernel: md: rdev superblock: Mar 19 21:35:20 OST3 kernel: md: SB: (V:1.0.0) ID:<9859f274.34313a61.00000030.00000000> CT:5d3314af Mar 19 21:35:20 OST3 kernel: md: L234772919 S861164367 ND:1970037550 RD:1919251571 md1667457582 LO:65536 CS:196610 Mar 19 21:35:20 OST3 kernel: md: UT:00000800 ST:0 AD:1565563648 WD:1 FD:8 SD:0 CSUM:00000000 E:00000000 Mar 19 21:35:20 OST3 kernel: D 0: DISK<N:-1,(-1,-1),R:-1,S:-1> Mar 19 21:35:20 OST3 kernel: D 1: DISK<N:-1,(-1,-1),R:-1,S:-1> Mar 19 21:35:20 OST3 kernel: D 2: DISK<N:-1,(-1,-1),R:-1,S:-1> Mar 19 21:35:20 OST3 kernel: D 3: DISK<N:-1,(-1,-1),R:-1,S:-1> Mar 19 21:35:20 OST3 kernel: md: THIS: DISK<N:0,(0,0),R:0,S:0> < output truncated > Professor Samuel Aparicio BM BCh PhD FRCPath Nan and Lorraine Robertson Chair UBC/BC Cancer Agency 675 West 10th, Vancouver V5Z 1L3, Canada. office: +1 604 675 8200 lab website http://molonc.bccrc.ca _______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss
