[gpfsug-discuss] Biggest file that will fit inside an inode? 3876!
Marc A Kaplan
makaplan at us.ibm.com
Mon Oct 3 15:53:51 BST 2016
Pretty easy to determine experimentally, with a few trials....
And the answer is 3876 for an simple file with just a selinux EA which is
apparently created by default on my test system.
So apparently there are actually only 220 bytes of metadata in this case
(4096-3876=220).
As they say YMMV ;-)
[root at bog-wifi cmvc]# mmlsfs yy -i
flag value description
------------------- ------------------------
-----------------------------------
-i 4096 Inode size in bytes
[root at bog-wifi isize]# stat i387[67]
File: ‘i3876’
Size: 3876 Blocks: 0 IO Block: 262144 regular file
File: ‘i3877’
Size: 3877 Blocks: 16 IO Block: 262144 regular file
[root at bog-wifi isize]# ls -ild i3876
19406 -rw-r--r--. 1 root root 3876 Oct 3 10:39 i3876
tsdbfs yy
inode 19406
Inode 19406 [19406] snap 0 (index 14 in block 303):
Inode address: 1:511600 size 4096 nAddrs 323
indirectionLevel=INODE status=USERFILE
objectVersion=2 generation=0x7C5599C4 nlink=1
owner uid=0 gid=0 mode=0200100644: -rw-r--r--
...
Data [3876]:
0000000000000000: 136D7B1F 1D29CA0C B59BC917 D9AE0220 *.m{..)..........*
0000000000000010: F18512CF 998AC02E DC6926FA 3FDC3EAF *.........i&.?.>.*
...
0000000000000F20: EFF02209 00000000 05077365 6C696E75 *..".......selinu*
trailer: 0x20005993FD8 diskAddrs 323 xattrLen 48 (free 3856/3904) res
0,0,0
overflow pri 0 vers 0 nsub 0 repl 1/2 DA Null
[0] id 0x5 prefLen 8 keyLen 7 key security.selinux len 37 val
'756E636F6E66696E65645F753A6F626A6563745F723A756E6C6162656C65645F743
A733000'
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