William L. Maltby wrote: > On Mon, 2009-09-21 at 17:05 -0700, Bazooka Joe wrote: >> I have a usb hd that I use for backup. Occasionally it dies. >> >> scsi 6:0:0:0: rejecting I/O to dead device >> scsi 6:0:0:0: rejecting I/O to dead device >> scsi 6:0:0:0: rejecting I/O to dead device >> scsi 6:0:0:0: rejecting I/O to dead device >> Buffer I/O error on device sdc1, logical block 0 >> lost page write due to I/O error on sdc1 >> EXT2-fs error (device sdc1): read_inode_bitmap: Cannot read inode >> bitmap - block_group = 129, inode_bitmap = 4227073 >> scsi 6:0:0:0: rejecting I/O to dead device >> scsi 6:0:0:0: rejecting I/O to dead device >> scsi 6:0:0:0: rejecting I/O to dead device >> Buffer I/O error on device sdc1, logical block 0 >> lost page write due to I/O error on sdc1 >> EXT2-fs error (device sdc1): ext2_readdir: bad page in #2 >> scsi 6:0:0:0: rejecting I/O to dead device >> scsi 6:0:0:0: rejecting I/O to dead device >> Buffer I/O error on device sdc1, logical block 0 >> lost page write due to I/O error on sdc1 >> EXT2-fs error (device sdc1): ext2_get_inode: unable to read inode >> block - inode=2, block=1027 >> scsi 6:0:0:0: rejecting I/O to dead device >> scsi 6:0:0:0: rejecting I/O to dead device >> Buffer I/O error on device sdc1, logical block 0 >> lost page write due to I/O error on sdc1 >> EXT2-fs error (device sdc1): ext2_readdir: bad page in #2 >> >> If i unmount it and try to remount it it says sdc1 does not exist. > > It may not be the USB drive. I have one that daoe the same, usually only > after long periods oh high (in)activity. > > On another node, no problems ever using that same drive. > > On the system with the problem, CentOS 4.7, Via Kt-400A chipset. > > One the other system, Centos 5.3, Via KT-880 chipset. > > I've not bothered to google yet, since it seems to occur after leaving > it attached for long periods and what I do doesn't take long > > Maybe there's a clue? This can happen if the drive has power-saving features and it's gone to sleep after no activity. What does 'sdparm -a /dev/sdc' yield? And what make/model is the disk?