<HTML><BODY>Hello! I have an IBM System x3200 M2 with Fibre HBA: Brocade Communications Systems, Inc. 415/815/41B/81B 4Gbps/8Gbps PCIe single port FC HBA (rev 01), on it installed Red Hat Enterprise Linux 5 kernel 2.6.18-238.19.1. used native multipath-tools v0.4.7 (03/12, 2006) and mdadm.#modinfo bfafilename: /lib/modules/2.6.18-238.19.1.el5/kernel/drivers/scsi/bfa/bfa.ko version: 2.1.2.0 author: Brocade Communications Systems, Inc. description: Brocade Fibre Channel HBA Driver fcpimand IBM DS 3512 with 2 LUN, LUN this raid6configured multipath configuration:#cat /etc/multipath.confdefaults { # user_friendly_names no # polling_interval 2 # path_selector "round-robin 0" # selector "round-robin 0" # polling_interval 2 # find_multipaths yes # flush_on_last_del yes # checker_timeout 10 # failback immediate # failback manual # path_checker readsector0 # path_checker rdac # path_grouping_policy failover # path_grouping_policy multibus # rr_min_io 100 # features 0 # no_path_retry fail # getuid_callout "/sbin/scsi_id -g -u -s /block/%n" # getuid_callout "/lib/udev/scsi_id --whitelisted --device=/dev/%n." # prio_callout "/sbin/mpath_prio_rdac /dev/%n" # dev_loss_tmo 10 # fast_io_fail_tmo 5 }#defaults #################### blacklist { devnode "sda" wwid * }#blacklist #################### blacklist_exceptions { #osnovnoy_1 wwid 360080e50002ef5ee00000bbe524a8ced #rezerv_1 wwid 360080e50002ef5ee00000bc1524a8d93 }#blacklist_exceptions #################### devices { device { vendor "IBM" product "1746 FAStT" # path_checker rdac # path_selector "round-robin 0" }#device }#devices #################### multipaths { multipath { wwid 360080e50002ef5ee00000bbe524a8ced alias osnov_1 } multipath { wwid 360080e50002ef5ee00000bc1524a8d93 alias rezerv_1 } } #lsscsi [0:2:0:0] disk IBM ServeRAID-MR10k 1.40 /dev/sda [3:0:0:0] disk IBM 1746 FAStT 1070 /dev/sdb [3:0:0:1] disk IBM 1746 FAStT 1070 /dev/sdf [3:0:0:31] disk IBM Universal Xport 1070 - [3:0:1:0] disk IBM 1746 FAStT 1070 /dev/sdh [3:0:1:1] disk IBM 1746 FAStT 1070 /dev/sdi [3:0:1:31] disk IBM Universal Xport 1070 - [3:0:2:0] disk IBM 1746 FAStT 1070 /dev/sdj [3:0:2:1] disk IBM 1746 FAStT 1070 /dev/sdk [3:0:2:31] disk IBM Universal Xport 1070 - [3:0:3:0] disk IBM 1746 FAStT 1070 /dev/sdl [3:0:3:1] disk IBM 1746 FAStT 1070 /dev/sdm [3:0:3:31] disk IBM Universal Xport 1070 - [4:0:0:0] disk IBM 1746 FAStT 1070 /dev/sdc [4:0:0:1] disk IBM 1746 FAStT 1070 /dev/sdd [4:0:0:31] disk IBM Universal Xport 1070 - [4:0:1:0] disk IBM 1746 FAStT 1070 /dev/sde [4:0:1:1] disk IBM 1746 FAStT 1070 /dev/sdg [4:0:1:31] disk IBM Universal Xport 1070 - [4:0:2:0] disk IBM 1746 FAStT 1070 /dev/sdn [4:0:2:1] disk IBM 1746 FAStT 1070 /dev/sdo [4:0:2:31] disk IBM Universal Xport 1070 - [4:0:3:0] disk IBM 1746 FAStT 1070 /dev/sdp [4:0:3:1] disk IBM 1746 FAStT 1070 /dev/sdq [4:0:3:31] disk IBM Universal Xport 1070 - #multipath -ll osnov_1 (360080e50002ef5ee00000bbe524a8ced) dm-2 IBM,1746 FAStT [size=11T][features=3 queue_if_no_path pg_init_retries 50][hwhandler=1 rdac][rw] \_ round-robin 0 [prio=400][active] \_ 4:0:0:0 sdc 8:32 [active][ready] \_ 3:0:1:0 sdh 8:112 [active][ready] \_ 3:0:3:0 sdl 8:176 [active][ready] \_ 4:0:2:0 sdn 8:208 [active][ready] \_ round-robin 0 [prio=0][enabled] \_ 3:0:0:0 sdb 8:16 [active][ghost] \_ 4:0:1:0 sde 8:64 [active][ghost] \_ 3:0:2:0 sdj 8:144 [active][ghost] \_ 4:0:3:0 sdp 8:240 [active][ghost] rezerv_1 (360080e50002ef5ee00000bc1524a8d93) dm-3 IBM,1746 FAStT [size=11T][features=3 queue_if_no_path pg_init_retries 50][hwhandler=1 rdac][rw] \_ round-robin 0 [prio=400][active] \_ 4:0:0:1 sdd 8:48 [active][ready] \_ 3:0:1:1 sdi 8:128 [active][ready] \_ 3:0:3:1 sdm 8:192 [active][ready] \_ 4:0:2:1 sdo 8:224 [active][ready] \_ round-robin 0 [prio=0][enabled] \_ 3:0:0:1 sdf 8:80 [active][ghost] \_ 4:0:1:1 sdg 8:96 [active][ghost] \_ 3:0:2:1 sdk 8:160 [active][ghost] \_ 4:0:3:1 sdq 65:0 [active][ghost] configured mdadm configuration:#mdadm -D /dev/md0 mdadm: metadata format 1.00 unknown, ignored. /dev/md0: Version : 1.00 Creation Time : Tue Oct 22 12:34:01 2013 Raid Level : raid1 Array Size : 11718818096 (11175.94 GiB 12000.07 GB) Used Dev Size : 11718818096 (11175.94 GiB 12000.07 GB) Raid Devices : 2 Total Devices : 2 Preferred Minor : 0 Persistence : Superblock is persistentIntent Bitmap : InternalUpdate Time : Thu Oct 24 11:45:38 2013 State : active Active Devices : 2 Working Devices : 2 Failed Devices : 0 Spare Devices : 0Name : 0 UUID : cfffde5b:3f232606:f45a5be9:d7a5c4b2 Events : 21Number Major Minor RaidDevice State 0 253 4 0 active sync /dev/dm-4 1 253 5 1 active sync /dev/dm-5 #cat /proc/mdstat Personalities : [raid1] md0 : active raid1 dm-4[0] dm-5[1] 11718818096 blocks super 1.0 [2/2] [UU] bitmap: 0/11 pages [0KB], 524288KB chunkunused devices: <none> md0 is formatted in ext3#tune2fs -l /dev/md0 tune2fs 1.39 (29-May-2006) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: 6a2352e4-be78-4c53-80a3-a7e7614cb6c2 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal resize_inode dir_index filetype needs_recovery sparse_super large_file Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 1464860672 Block count: 2929704524 Reserved block count: 29297045 Free blocks: 2883691408 Free inodes: 1464860662 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 325 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 16384 Inode blocks per group: 512 Filesystem created: Wed Oct 23 09:16:11 2013 Last mount time: Thu Oct 24 11:45:33 2013 Last write time: Thu Oct 24 11:45:33 2013 Mount count: 5 Maximum mount count: 38 Last checked: Wed Oct 23 09:16:11 2013 Check interval: 15552000 (6 months) Next check after: Mon Apr 21 09:16:11 2014 Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 Default directory hash: tea Directory Hash Seed: 82383c38-be3a-4096-9082-ad295ee3404e Journal backup: inode blocksmd0 mounted on /osnov. and using the command: #dd if=/dev/zero of=/osnov/test bs=1MB count=1000 or simply copy from MCvswe get:Code: 0f 0b 68 ce fc 2c 88 c2 95 04 8d 42 01 66 89 45 00 c7 43 50 RIP [<ffffffff80218ab2>] bitmap_startwrite+0xb5/0x101 RSP<ffff81105fbb9c20> <0>Kernel panic - not syncing: Fatal exceptionwithout bitmap all works! You can get rid of this problem without installing new drivers and programs? -- Yuriy Vet </BODY></HTML>