How to replace ESXi properly to keep the iSCSI datastore?

Hi guys,.

I explore ESXi on a usbstick. It connects

a NAS server using iSCSI. It works fine, until I screwed something on the

Configuration of ESXi that it cannot be managed again VI client.

Thus,.

I have replace the usbstick by a new one. Again install ESXi and iSCSI.

He finds the logic unit number, but it gives warning that using this LUN will destroy

all data in this document, which destroys fortunately when I click OK.

Thus,.

in this case, it is good way to regain the intact data store if we

you will need to change the ESXi? Or, there is no such scenario?

Thank you.

Hello

So a VMFS store be reintroduced to ESX or ESXi the VMFS volume must be readable and correspond to the EUI header / NAA set to paths of storage host created in the esx.conf file or the VC DB vml. If this information is not present while the volume will not be presented as a usable existing VMFS store. I have a blog with some examples to reinstate VMFS stores based on OpenSolaris and ZFS iSCSI volumes.

http://blog.laspina.ca/roller/ubiquitous/entry/provisioning_disaster_recovery_with_zfs

You can examine the EUI or NAA on any VMFS work and ESX volume with the following command.

esxcfg-vmhbadevs - m

This gives command the name of dev which are associated with the volume and this info you can use hexdump similar to the following.

hexdump - n 1100000/dev/sda1

The hexagonal header data will present it as this example output, the value in bold is the guid of stores.

0100000 d00d 0003 0000 0010 0000 1602 0002 c001

0100010 0600 5553 204th 2020 2020 4f43 534 d 4154

0100020 2052 2020 2020 2020 2020 2e31 2030 0160

0100030 f044 0004 0000 2 a 49 142F 0400 4f43 d47e

0100040 0000 0000 0000 0000 0000 0000 534 d 4154

0100050 0000 0000 0000 0000 0000 0200 0000 f800

0100060 0031 0000 0001 0000 0000 031f 031f ffd4

0100070 0000 0321 0000 0000 0000 0000 0110 0000

0100080 0000 3eee 492 has 7cb8 960f 2-0200-6755 16 c

4e14 0100090 7fda dec9 5 c 68 0004 cf98 managenment 5 c 68

01000a 0 0004 0000 0000 0000 0000 0000 0000 0000

01000b 0 0000 0000 0000 0000 0000 0000 0000 0000

With this information, you can recreate the vml, but it is difficult you should know the format, but for example, we can go.

Use the following command to see what exists in a lot of work.

cat /etc/vmware/esx.confcat /etc/vmware/esx.conf | grep vml

/Storage/LUN/VML.0200020000600144f07ed404000000492a2e140004434f4d535441/adapteriqn.1998-01.com.VMware:vh0.1/targetiqn.1986-03.com.Sun:02:1eddb8ec-CC09-62d0-B867-8da28dee9609/

Here we see the part that must match in blue.

Also a little advice on usb based ESXi priming devices, you should not run this type of config at least as the creator of the image usb provided a virtual disk for the swap area.

Flash multi layer devices will fail quickly if the swap partition area is on the flash device.

Kind regards

Mike

Tags: VMware

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