What does Fdisk-lu actually mean?


I'm not a Linux guy, so forgive me for this question "junior."  When I 1st started with VMware I loaded ESX 3.5 and thought that the default partitions proposed by the GUI should be good enough. 1 year later, 2 guests ran fine without any problems, everything should be OK. Recently, I upgraded to ESX 4.0 via the Update Manager Vcenter, so always good. Of course along the way, I found many, many opinions on what "partition" best sizes should be for ESX. OK, I was able to understand some issues, as if the default location for the unannounced dumps core is full, he picks up the file system in the partition.

Study for my VCP - 410 exam, there are many references to the size of 'minium' partition to install ESX4.0. My experience in the world of Windows "diskpart" was a subject that you didn't really want to play around. So today, I decided to 'see' what were the partitions on my server ESX4.0 (pasted below). Using fdisk-lu, df-h and vdf - h, I realized that "dev/cciss/c0d0px" partitions are on the system drive local (locally for this ESX host boots), which is a HP Smartarray RAID1 72 GB table on a server BL680. I can deal with that, I see 7 partitions, which I can understand the VMFS file would be based on the size of the partition.

What I can't understand where is the/dev/sdax "disks/partitions" coming from? It seems that/dev/sda5 = / dev/cciss/c0d0p2 &/dev/sda2 = / dev/cciss/c0d0p7 (I assume that on the size of the partition). Can someone tell me what the "decoder" secret of ring, it's that I'm missing here? Is there a 'physical' of 'logic' device name mapping device that I need to understand?

PS: Yes I'm not run cleanup ESX3.5 script (/ usr/sbin/cleanup-esx3) yet. Had only 5 days on ESX4.0.

# fdisk - read

Disk/dev/cciss/c0d0: 73.3 GB, 73372631040 bytes

255 heads, 63 sectors/track, 8920 cylinders, total of 143305920 areas

Units is 1 * 512 sectors is 512 bytes

Device boot start end blocks Id system

/ dev/CCISS/c0d0p1 * 63 208844 104391 83 Linux 104 MB

/ dev/CCISS/c0d0p2 208845 10442249 5116702 + 83 Linux 5.1 GB

/ dev/CCISS/c0d0p3 10442250 137901959 63729855 fb VMware VMFS 63.7 GB

/ dev/CCISS/c0d0p4 137901960 143299799 2698920 f W95 Ext'd (LBA) 2.6 GB

/ dev/CCISS/c0d0p5 143091018 143299799 fc VMware VMKCORE 104 MB 104391

/ dev/CCISS/c0d0p6 137902086 139010444 554179 + 82 Linux swap / Solaris 554 MB

/ dev/CCISS/c0d0p7 139010508 143090954 2040223 + 83 Linux 2.0 GB

Partition table entries are not in the order of disc

Disk/dev/sda: 8459 MB, 8459911168 bytes

255 heads, 63 sectors/track, cylinders of 1028, total 16523264 areas

Units is 1 * 512 sectors is 512 bytes

Device boot start end blocks Id system

/ dev/sda1 63 2184839 1092388 + 82 Linux swap / Solaris

/ dev/sda2 2184840 6281414 2048287 + 83 Linux

/ dev/sda3 6281415 16514819 5116702 + 5 extended

/ dev/sda5 6281478 16514819 5116671 83 Linux

Size of filesystem used Avail use % mounted on

/ dev/sda5 4.9 G 1.7 G 3.0 G 37%.

/ dev/sda2 2.0 G 67 M 1.8 G 4% / var/log

/ dev/CCISS/c0d0p1 99 M 71 M 24 M 75% / Boot

/ dev/CCISS/c0d0p2 4.9 G 1.7 G 2.9 G 38% / esx3-installation

/ dev/CCISS/c0d0p1 99 M 71 M 24 M 75% / esx3-installation/boot

/ dev/CCISS/c0d0p7 2.0 G 900 M 962 M 49% / esx3-installation/var/log

# vdf h

Size of filesystem used Avail use % mounted on

/ dev/sda5 4.9 G 1.7 G 3.0 G 37%.

/ dev/sda2 2.0 G 68 M 1.8 G 4% / var/log

/ dev/CCISS/c0d0p1 99 M 71 M 24 M 75% / Boot

/ dev/CCISS/c0d0p2 4.9 G 1.7 G 2.9 G 38% / esx3-installation

/ dev/CCISS/c0d0p1 99 M 71 M 24 M 75% / esx3-installation/boot

/ dev/CCISS/c0d0p7 2.0 G 900 M 962 M 49% / esx3-installation/var/log

/ vmfs/68 0 68 0% / vmfs/material

/ vmfs/volumes/48189b1c-009bf40e - b 7, 75 - 001e0b921f54 60G 30 G 29G 50% vmfs/volumes / esx100:storage1

/ vmfs/volumes/481e4761-7ba08156-89f9-001e0b921f54 98G 44 G 53G 45% / vmfs/volumes/Raid 10 secondary


So you say to the COS ESX uses this VMDK 'reader' divided into partitions/dev/sda1/2/3/5, Yes?

Right... are partintions of a single vmdk file.

dev/cciss/c0/d0/p7, 2 = the 'old' partitions COS divides for ESX 3.5?

You must read the point of editing... for example with the release of df:

/ dev/CCISS/c0d0p2 4.9 G 1.7 G 2.9 G 38% / esx3-installation

/ dev/CCISS/c0d0p1 99 M 71 M 24 M 75% / esx3-installation/boot

/ dev/CCISS/c0d0p7 2.0 G 900 M 962 M 49% / esx3-installation/var/log

As you can see also/dev/cciss/c0d0p1 wore on old ESX installation

/ dev/CCISS/c0d0p5 = ESX 4.0 Kernal partition?

Yes... to exit fdisk:

/ dev/CCISS/c0d0p5 143091018 143299799 fc VMware VMKCORE 104 MB 104391

/ dev/CCISS/c0d0p6 = swap for ESX Kernal?

Yes... but is not used by ESX 4.0, it was former swap space

/ dev/CCISS/c0d0p1 = the boot partition?

Yes... output of df:

/ dev/CCISS/c0d0p1 99 M 71 M 24 M 75% / Boot

As you see it is as well the boot for ESX 3.5 and 4.0 partition... It is usual


Tags: VMware

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