I have some embedded boards running American Megatrends bios with embedded linux as the OS. The problem I have is that the industrial flash ide's will be corrupted on power loss. I have them formatted as ext4. Whenever this happens, I can usually fix the flash with fsck, but this will not be possible in our deployments. I have heard that disabling the write-caching should help, but I can't figure out how to do it. Also, is there any thing else I should do?
The drive is a 4gb ide flash module. I have one partition which is ext4. The O.S. is installed on that partition and grub is my bootloader.
fdisk -l shows /dev/sda as my flash module with /dev/sda1 as my primary partition.
After a power loss I usually cannot make it entirely through the boot init scripts.
When I mount the drive on another P.C. I run fsck /dev/sda1. It always shows messages like
"zero datetime on node 1553 ... fix (y)?"
I fix them and it boots fine until the next power loss.
When I get to the office tomorrow, I will post the actual output of fdisk -l
This is all I know about how the system works. I am not a systems guy, I am a Software Engineer that has a habit of getting into predicaments that are outside of his job description. I know how to format drives, install a bootloader, write software, and hack on an operating system.
Here is the output from dumpe2fs
#sudo dumpe2fs /dev/sda1 dumpe2fs 1.41.12 (17-May-2010) Filesystem volume name: VideoServer Last mounted on: / Filesystem UUID: 9cba62b0-8038-4913-be30-8eb211b23d78 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: ext_attr resize_inode dir_index filetype extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize Filesystem flags: signed_directory_hash Default mount options: (none) Filesystem state: not clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 245760 Block count: 977949 Reserved block count: 48896 Free blocks: 158584 Free inodes: 102920 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 239 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 8192 Inode blocks per group: 512 Flex block group size: 16 Filesystem created: Fri Feb 4 15:12:00 2011 Last mount time: Sun Oct 2 23:48:37 2011 Last write time: Mon Oct 3 16:34:01 2011 Mount count: 2 Maximum mount count: 26 Last checked: Tue Oct 4 07:44:50 2011 Check interval: 15552000 (6 months) Next check after: Sun Apr 1 07:44:50 2012 Lifetime writes: 21 GB Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Default directory hash: half_md4 Directory Hash Seed: 249d2b79-1e20-49a3-b324-6cb631294a63 Journal backup: inode blocks