df, lvm and 6TB arrays oh my!

[Mark Haney]

Robert Locke wrote:
> On Mon, 2006-02-13 at 08:22 -0500, Mark Haney wrote:
>   
>> Robert Locke wrote:
>>     
>>>>     
>>>>         
>>> OK, so lvdisplay showing the full amount is good, so the underlying
>>> virtual partition is 6.36TB....  Now the tune2fs I was suggesting was
>>> simply the -l option that would dump the ext2/3 superblock.  We should
>>> be able to see the "block count" and the "block size" which when
>>> multiplied should be 6.36TB.  Since you are at least on a 2.6 kernel, I
>>> don't think we have the 2TB filesystem limit, though I don't remember
>>> when that got bumped up to 32....
>>>
>>> --Rob
>>>
>>>   
>>>       
>> I hate to be a complete idiot, but I can't get tune2fs to work on the 
>> lv, I must be doing something wrong.  Can you use tune2fs on an lvm volume?
>>
>>     
>
> <big grin>
>
> Should just be "tune2fs -l /dev/vgname/lvname".  So try:
>
> tune2fs -l /dev/Volume02/Volume02lv
> tune2fs -l /dev/Volume03/Volume03lv
>
> That should generate about a page of each....
>
> --Rob
>
>   
I just got time to actually figure that out.  I'm not a complete 
imbecile, I swear.  Here's the output of one 6.36TB array:

ilesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          d775f424-2a12-44ac-9260-c00013f963ee
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal filetype needs_recovery 
sparse_super large_file
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              316325888
Block count:              632648704
Reserved block count:     31632435
Free blocks:              622713507
Free inodes:              316325877
First block:              0
Block size:               4096
Fragment size:            4096
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         16384
Inode blocks per group:   512
Filesystem created:       Thu Jan  5 13:41:11 2006
Last mount time:          Mon Feb 13 14:06:06 2006
Last write time:          Mon Feb 13 14:06:06 2006
Mount count:              2
Maximum mount count:      31
Last checked:             Thu Jan  5 13:41:11 2006
Check interval:           15552000 (6 months)
Next check after:         Tue Jul  4 14:41:11 2006
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:      62d0ad33-5300-481b-8620-bbdb6fd30a5b
Journal backup:           inode blocks


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Mark Haney
Sr. Systems Administrator
ERC Broadband
(828) 350-2415