Bug 16021
| Summary: | mptsas target reset under heavy duty | ||
|---|---|---|---|
| Product: | IO/Storage | Reporter: | dujun |
| Component: | SCSI | Assignee: | kashyap (kashyap.desai) |
| Status: | RESOLVED INVALID | ||
| Severity: | normal | CC: | akpm, alan, dujun |
| Priority: | P1 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Kernel Version: | 2.6.32 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
https://bugzilla.kernel.org/show_bug.cgi?id=14831 with patch from above bug report, it seems it solved the problem. However the performance is much worse than before. |
We have mptsas driver 4.22.00.00 from lsi official web site driving 1068e chip which is connected to two lsi 12x expander chips. Each of the chips connects 8 sata disks. Under heavy duty, i.e., when we connect 16 hdd and build the linux software raid5, there are lots of error reports in dmesg: [20826.611906] mptscsih: ioc0: task abort: FAILED (sc=ffff88007b348c00) [20826.611919] mptscsih: ioc0: attempting target reset! (sc=ffff88007dc78700) [20826.611921] sd 4:0:16:0: [sdq] CDB: Read(10): 28 00 54 94 55 00 00 00 90 00 [20827.361823] mptscsih: ioc0: target reset: SUCCESS (sc=ffff88007dc78700) [20837.361008] mptscsih: ioc0: attempting task abort! (sc=ffff88007dc78700) [20837.361011] sd 4:0:16:0: [sdq] CDB: Test Unit Ready: 00 00 00 00 00 00 [20837.385655] mptbase: ioc0: LogInfo(0x31112000): Originator={PL}, Code={Reset}, SubCode(0x2000) [20838.111238] mptbase: ioc0: LogInfo(0x31130000): Originator={PL}, Code={IO Not Yet Executed}, SubCode(0x0000) This would halt the io for about two minutes and then after successful target reset, the io is continuing. If we reduce the hdd to less than 12, or we set the scsi command depth of each of the disks to 1, the build process could complete without any error. We also tested the same scenario with lsi 36x expander chip without any problem. Is this a mptsas driver bug or just the 12x expander chip bug?