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I cannot figure out the mapping between different logical and physical block device names. The output of "cat /proc/diskstats" is :

 104    0 cciss/c0d0 ...
 104    1 cciss/c0d0p1 ...
 104    2 cciss/c0d0p2 ...
 104    16 cciss/c0d1 ...
 253    0 dm-0 ...
 253    1 dm-1 ...
 253    2 dm-2 ...
 253    3 dm-3 ...

The output of "df -h" is :

/dev/cciss/c0d0p1                 99M   39M   56M  42% /boot
/dev/mapper/VolGroup01-LogVol02   908G  760G  103G  89% /home
/dev/mapper/VolGroup01-LogVol03   193G  181G  2.6G  99% /opt
/dev/mapper/VolGroup00-LogVol00   54G   11G   41G  21%  /

Where do I find the mapping between "cciss" , "dm-#", and "VolGroup##" ?

Thanks

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Everything in the /dev/mapper directory is typically a symlink to the actual device. – jw013 Jun 19 '12 at 1:29

2 Answers

up vote 6 down vote

There're handy dmsetup ls --tree and lsblk utils.

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Although that doesn't give you the mapping between VGs and their PVs. For that, you'd need to run pvdisplay and vgdisplay and correlate their output to that of dmsetup ls. – Alexios Jun 19 '12 at 9:54
@Alexios, ? Didn't try lsblk? – poige Jun 20 '12 at 13:17
up vote 1 down vote

Ok, finally figured that out.

pvscan command provides the mapping I'm looking for.

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pvs, rather, or did I misunderstand the question? – Gilles Jun 19 '12 at 23:37

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