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The command dumpfs outputs the super block and cylinder group information for the specified file system. This command can, for example, be used to determine the block and fragment sizes which are specifed for the file system as well as the minimum required storage space in percent.
Syntax
dumpfs file_system |
Name of the file system for which the information is to be output. This command may only be entered by the POSIX administrator. It is only of use to system maintenance staff for diagnostic purposes. |
Hint
| The dumpfs command is not supported for bs2fs file systems. |
Example
Printing out information on the root file system: # dumpfs /
magic 11954 version 0 time Thu Jun 18 10:29:10 2020
sblkno 4 cblkno 6 iblkno 8 dblkno 72
sbsize 4096 cgsize 4096 cgoffset 8 cgmask 0xfffffff8
ncg 147 size 150528 blocks 140527 ocgmask 0x00000000
bsize 8192 shift 13 mask 0xffffe000
fsize 4096 shift 12 mask 0xfffff000
frag 2 shift 1 fsbtodb 1
minfree 10% maxbpg 1024
maxcontig 1 rotdelay 0ms rps 60
csaddr 72 cssize 4096 shift 9 mask 0xfffffe00
ntrak 8 nsect 16 spc 128 ncyl 2352
cpg 16 bpg 512 fpg 1024 ipg 2048
nindir 2048 inopb 64 nspf 2
nbfree 50121 ndir 322 nifree 293245 nffree 76
cgrotor 73 fmod 0 ronly 0 flags 0x00
cs[].cs_(nbfree,ndir,nifree,nffree):
(197,7,2021,1) (22,7,1980,2) ...
cg 0:
magic 190255 tell 6000 time Mon Jun 22 19:40:00 2020
cgx 0 ncyl 16 niblk 2048 ndblk 1024
nbfree 198 ndir 7 nifree 2013 nffree 1
rotor 628 irotor 32 frotor 624
frsum 1
sum of frsum: 1
iused: 0-31, 33-35
free: 94-95, 629-1023
...
cg 146:
magic 90255 tell 24816000 time Thu Sep 7 13:46:32 2017
cgx 146 ncyl 0 niblk 2048 ndblk 1024
nbfree 478 ndir 0 nifree 2048 nffree 0
rotor 0 irotor 0 frotor 0
frsum 0
sum of frsum: 0
iused:
free: 0-19, 88-1023
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