Hi, I am trying to create a mirrored disk log. I have four block devices, two for the log (which is a mirror!) and two for the actual mirror device. But I can't use the mirror device at all. It just hangs for any read/write. Here are the details of dmsetup calls. I am using RHEL5 (2.6.18-8.el5). Looks like a mirror module bug and I appreciate any help. dev1="/dev/sda1" dev2="/dev/sdb1" dev3="/dev/sdc1" dev4="/dev/sdd1" echo "0 8192 mirror core 1 512 2 $dev1 0 $dev2 0" | dmsetup create log echo "0 24576 mirror disk 2 /dev/mapper/log 512 2 $dev3 0 $dev4 0" | dmsetup create mirror The following are the stack traces for kmirrord and the "dd if=/dev/mapper/mirror of=/dev/null" command on the mirror: crash> bt 312 PID: 312 TASK: c00000001dd311d0 CPU: 1 COMMAND: "kmirrord" #0 [c00000001dd577d0] .schedule at c0000000003483c8 #1 [c00000001dd578e0] .io_schedule at c000000000349094 #2 [c00000001dd57970] .sync_io at d0000000002777f4 #3 [c00000001dd57a20] .dm_io_sync_vm at d0000000002778a0 #4 [c00000001dd57af0] .disk_flush at d0000000000808cc #5 [c00000001dd57b90] .do_work at d00000000008342c #6 [c00000001dd57d50] .run_workqueue at c00000000007b76c #7 [c00000001dd57df0] .worker_thread at c00000000007c4d8 #8 [c00000001dd57ee0] .kthread at c000000000080fb8 #9 [c00000001dd57f90] .kernel_thread at c0000000000264bc crash> bt 2489 PID: 2489 TASK: c00000000747cbc0 CPU: 1 COMMAND: "dd" #0 [c00000000717b5c0] .schedule at c0000000003483c8 #1 [c00000000717b6d0] .io_schedule at c000000000349094 #2 [c00000000717b760] .sync_page at c0000000000aa180 #3 [c00000000717b7e0] .__wait_on_bit_lock at c0000000003492c0 #4 [c00000000717b880] .__lock_page at c0000000000a9fa4 #5 [c00000000717b950] .do_generic_mapping_read at c0000000000aad00 #6 [c00000000717baa0] .__generic_file_aio_read at c0000000000aba74 #7 [c00000000717bb70] .generic_file_read at c0000000000ad0c8 #8 [c00000000717bcf0] .vfs_read at c0000000000e0f10 #9 [c00000000717bd90] .sys_read at c0000000000e13f4 #10 [c00000000717be30] syscall_exit at c00000000000869c syscall [c00] exception frame: R0: 0000000000000003 R1: 00000000ffedf650 R2: 000000000fff9450 R3: 0000000000000000 R4: 0000000010030000 R5: 0000000000000200 R6: 000000001001d1a8 R7: 0000000000000000 R8: 00000000000001ff R9: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000010025144 R14: 0000000000000000 R15: 0000000010040a60 R16: 000000001001d190 R17: 000000001001d198 R18: 0000000000000000 R19: 000000001001d1f4 R20: 000000001001d128 R21: 000000001001d178 R22: 000000001001d160 R23: 000000001001d1bc R24: 0000000010030000 R25: 000000001001d170 R26: 000000001001d170 R27: 0000000000000000 R28: 0000000010030000 R29: 0000000000000200 R30: 000000001001d008 R31: 0000000010030200 NIP: 000000000ff1a6d4 MSR: 000000000000d032 OR3: 0000000000000000 CTR: 000000000ff1a6c0 LR: 0000000010001df4 XER: 0000000000000000 CCR: 0000000044000428 MQ: c000000000421ae8 DAR: 0000000010050c64 DSISR: 0000000042000000 Syscall Result: 0000000000000200 -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
