File size differences

Wed Dec 6 19:22:42 UTC 2006

Have you MD5SUM'd the file on both sides?  If it is the same, then you 
have no problems.

% md5sum filename

On each side, compare output.

Justin.

On Wed, 6 Dec 2006, dushy wrote:

> 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 at 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 at 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 at 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 at 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 at 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 at 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
> 
> 
> 
> 
> 
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