Hey, I have two identical machines setup with a RAID 5 array. One of them is used for failovers and data from the master is synced everyday using rsync to the failover machine. The data on this disks are usually intranet KB's, DB's etc.. The RAID 5 arrays are formatted using the default options i,e mkfs.ext3 /dev/Xda. The RAID controller is 3ware escalade and each disk member in the RAID 5 array are 400Gb IDE. Now the wierd part is, after syncing the failover with the master and comparing the size of each dir and file I find some files where the size mismatches.. [root@storage-master repositories]# du --si "/store1/SystemAdministration-OldVideos/SysAd Training/Technology Basics/000_READ_ME_FIRST_FOR_INDEX_OF_VIDEOS.txt" 8.2k /store1/SystemAdministration-OldVideos/SysAd Training/Technology Basics/000_READ_ME_FIRST_FOR_INDEX_OF_VIDEOS.txt root@storage-slave compare]# du --si "/store1/SystemAdministration-OldVideos/SysAd Training/Technology Basics/000_READ_ME_FIRST_FOR_INDEX_OF_VIDEOS.txt" 4.1k /store1/SystemAdministration-OldVideos/SysAd Training/Technology Basics/000_READ_ME_FIRST_FOR_INDEX_OF_VIDEOS.txt stat on the same file shows.. [root@storage-master repositories]# stat "/store1/SystemAdministration-OldVideos/SysAd Training/Technology Basics/000_READ_ME_FIRST_FOR_INDEX_OF_VIDEOS.txt" File: `/store1/SystemAdministration-OldVideos/SysAd Training/Technology Basics/000_READ_ME_FIRST_FOR_INDEX_OF_VIDEOS.txt' Size: 1126 Blocks: 16 IO Block: 4096 regular file Device: 801h/2049d Inode: 10403842 Links: 1 Access: (0775/-rwxrwxr-x) Uid: ( 48/ apache) Gid: ( 48/ apache) Access: 2006-09-11 12:22:24.000000000 +0530 Modify: 2004-09-23 16:45:31.000000000 +0530 Change: 2006-02-23 18:31:42.000000000 +0530 root@storage-slave compare]# stat "/store1/SystemAdministration-OldVideos/SysAd Training/Technology Basics/000_READ_ME_FIRST_FOR_INDEX_OF_VIDEOS.txt" File: `/store1/SystemAdministration-OldVideos/SysAd Training/Technology Basics/000_READ_ME_FIRST_FOR_INDEX_OF_VIDEOS.txt' Size: 1126 Blocks: 8 IO Block: 4096 regular file Device: 801h/2049d Inode: 23019536 Links: 1 Access: (0775/-rwxrwxr-x) Uid: ( 48/ apache) Gid: ( 48/ apache) Access: 2001-01-28 21:10:14.000000000 +0530 Modify: 2004-09-23 16:45:31.000000000 +0530 Change: 2001-01-28 21:10:14.000000000 +0530 The number of blocks allocated on the master seems to be 16 and the failover is 8. Is this the reason for the file size difference even though the content is the same ? I rsynced the same file from the master to a different server and the file size matched. Any reason why the no. of blocks allocated is different across both this machines ? The file i gave above is just a example and there are many more files like this. Also only 10% of the files have different sizes. I.e out of 263032 files/folders only 17655 have the above problem. Below is the ext3 filesystem info on both the master and failover. [root@storage-master repositories]# dumpe2fs -h /dev/sda1 dumpe2fs 1.35 (28-Feb-2004) Filesystem volume name: /store1 Last mounted on: <not available> Filesystem UUID: 2368a03d-f21f-4c5e-b12a-cbd2c726237c Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode filetype needs_recovery sparse_super large_file Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 97681408 Block count: 195354408 Reserved block count: 9767720 Free blocks: 22200635 Free inodes: 97329015 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 1024 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 16384 Inode blocks per group: 512 Filesystem created: Tue Jun 28 17:06:41 2005 Last mount time: Tue Oct 10 20:22:02 2006 Last write time: Tue Oct 10 20:22:02 2006 Mount count: 93 Maximum mount count: -1 Last checked: Thu Oct 20 19:03:56 2005 Check interval: 0 (<none>) Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) First inode: 11 Inode size: 128 Journal inode: 8 First orphan inode: 52691033 Default directory hash: tea Directory Hash Seed: 0449f257-e47d-4faf-92fa-fa497efab3a1 Journal backup: inode blocks [root@storage-slave compare]# dumpe2fs -h /dev/sda1 dumpe2fs 1.35 (28-Feb-2004) Filesystem volume name: <none> Last mounted on: <not available> Filesystem UUID: b003440d-d153-4cec-a668-94f5482d54cf Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem features: has_journal ext_attr resize_inode filetype needs_recovery sparse_super large_file Default mount options: (none) Filesystem state: clean Errors behavior: Continue Filesystem OS type: Linux Inode count: 97681408 Block count: 195354408 Reserved block count: 9767720 Free blocks: 26532722 Free inodes: 97327187 First block: 0 Block size: 4096 Fragment size: 4096 Reserved GDT blocks: 1024 Blocks per group: 32768 Fragments per group: 32768 Inodes per group: 16384 Inode blocks per group: 512 Filesystem created: Tue Jun 28 14:37:12 2005 Last mount time: Thu Nov 16 01:11:30 2006 Last write time: Thu Nov 16 01:11:30 2006 Mount count: 65 Maximum mount count: -1 Last checked: Thu Oct 6 15:11:41 2005 Check interval: 0 (<none>) 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: fa6b4317-d51d-4050-b0f3-c72b45148777 Journal backup: inode blocks tia dushy _______________________________________________ Ext3-users mailing list Ext3-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ext3-users
