Hi all, I have setuped a multipath enviornment as follows: (S/W) Linux distribution – RHEL 4 Linux kernel --- 2.6.10 or later (kernel.org) QLogic driver version – 8.00.00b21 Multipath I/O kernel patch – 2.6.10-rc1-udm1 Multipath I/O tools – multipath-tools-0.4.3 Udev version – v045 (H/W) 2 QLogic ISP2312 dual port FC HBA Emulex 375 Fiber Channel switch( 2 ports are connected to JBOD) Adaptec Fiber Channel JBOD First, I edit /etc/multipath.conf to add alias for sda and sdc. Then, multipathd multipath mkfs /udev/disk1 -t ext3 Now, sda is formating and sometimes some error messages appeared on screen: ################# mke2fs 1.35 (28-Feb-2004) max_blocks 4294967295, rsv_groups = 0, rsv_gdb = 1024 Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) 4447744 inodes, 8891620 blocks 444581 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=12582912 272 block groups 32768 blocks per group, 32768 fragments per group 16352 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624 Writing inode tables: done inode.i_blocks = 98312, i_size = 4243456 Creating journal (8192 blocks): done Writing superblocks and filesystem accounting information: 1:0:0:0: sg_io failed status 0x0 0x2 0x0 0x0 1:0:0:0: Unable to get INQUIRY vpd 1 page 0x0. pb getting path info, free 1:0:1:0: sg_io failed status 0x0 0x1 0x0 0x0 1:0:1:0: Unable to get INQUIRY vpd 1 page 0x0. pb getting path info, free 1:0:2:0: sg_io failed status 0x0 0x1 0x0 0x0 ....... ############################# In the meanwhile, I can get some error messages from dmesg as follows: ############################ qla2300 0000:07:01.1: Performing ISP error recovery - ha= c2314250. SCSI error : <1 0 0 0> return code = 0x20000 end_request: I/O error, dev sdd, sector 42731920 qla2300 0000:07:01.0: LIP reset occured (f7f7). qla2300 0000:07:01.0: LIP occured (f7f7). qla2300 0000:07:01.1: Parity error -- HCCR=5cb0. qla2300 0000:07:01.0: LIP reset occured (f7f7). qla2300 0000:07:01.0: LIP occured (f7f7). qla2300 0000:07:01.1: Performing ISP error recovery - ha= c2314250. ############################ Any comments for it? Thanx. -Aaron