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vmware storage issue

Posted on 2011-09-29
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Last Modified: 2012-05-12
hi

im fairly new to storage and was wondering if someone could provide me answers please

1. when you go into /vmfs/volumes and do an ls  i get the lun names e.g. lun1, lun2 etc and then i also get numbers like 4db34dgfs and a lot more digits etc. what are these? are they vml's from the luns to the actual volumes they see?

2. if i do a hexdump -c on a vmfs volume - what is this magic number i hear people on about and what does it mean ?//
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Question by:mikeleahy
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Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE) earned 250 total points
ID: 36816769
the 4e787d23-510cff25-2b5a-984be106c904 is the actually datastore (GUUID), which is linked to the friendly name you have also provided the datastore.

if you do a ls - al , you will see the symlinks.
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LVL 118
ID: 36816775
e.g.

lrwxr-xr-x    1 root     root                 35 Sep 29 17:45 iSCSI-lun1 -> 4e79251f-de887b6c-f3e5-984be108a569
lrwxr-xr-x    1 root     root                 35 Sep 29 17:45 iSCSI-lun2 -> 4e7b4ff6-78633f91-9737-984be106c904
lrwxr-xr-x    1 root     root                 35 Sep 29 17:45 iSCSI-lun3 -> 4e82209c-7fa9e707-3ed6-984be106c904
lrwxr-xr-x    1 root     root                 17 Sep 29 17:45 nfs -> 892c4679-1a95feb0
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LVL 118
ID: 36816786
you should also be able to access the contents of the datastore using the friendly name you have given the datastore or the datastore GUUID

by using

e.g.
cd "4e79251f-de887b6c-f3e5-984be108a569"

or

cd" iSCSI-lun1"
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LVL 118
ID: 36816791
as for 2. if i do a hexdump -c on a vmfs volume - what is this magic number i hear people on about and what does it mean ?//

you'll need to expand?
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LVL 118
ID: 36816800
maybe you are referring to Partition Alignment or Offset?

in what context have you seen the hexdump used?
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Author Comment

by:mikeleahy
ID: 36817074
thanks for that = what i mean is if i do a hexdump of a lun how can i tell if its a vmfs partition ?
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Author Comment

by:mikeleahy
ID: 36817081
and also how do i find the links between /dev/sda / b /c etc to the guuid and friendlly name ?
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LVL 118

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 250 total points
ID: 36817123
you would use fdisk and check for the partition type of fb to indetify if the LUN was VMFS.

/dev/sda are Linux terms

use

esxcfg-mpath -l
fdisk -lu

and you will see the relationship between hba, storage paths, device names, runtime names
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Author Comment

by:mikeleahy
ID: 36817163
thanks
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LVL 118
ID: 36817171
No problems
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Author Closing Comment

by:mikeleahy
ID: 36817175
very fast response and excellent knowledge
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