Category Archives: hardware

I’m in Tech Field Day 22!

From Wednesday December 9 to Friday December 11 I’ll be a delegate in Tech Field Day 22. I attended once before, in San Jose in 2014, for Storage Field Day 5 and now, 6 years later I’m in #TFD22! Time sure flies! This week we’ll be talking to some interesting companies once again.

These are the presenting companies and the delegates that will be attending:

Wednesday Thursday Friday
Early Presenting Companies Commvault
Quantum
Veeam
Red Hat
VMware
Delegate Panel Arjan Timmerman, Bart Heungens, Bruno Wollmann, Jasper Bongertz, Kori Younger, Lino Telera, Max Mortillaro, Michael Davis, Ned Bellavance, Phillip Sellers, Rob Koper, Steven Cortez
Late Presenting Companies Cisco
MemVerge
Riverbed Illumio
Delegate Panel Al Rasheed, Ben Mason, Chris Hildebrandt, Chris Maki, David Chapa, Erik Ableson, Jody Lemoine, Justin WarrenMatt Callaway, Matthew LeibNico Stein, Robert Novak, Scott Bollinger

 

It’s going to be an interesting few days and I’m very much looking forward to a renewed participation in this TFD event!

 

For more detailed information, please visit the TechField Day website.

How to match an Windows (HyperV) disk to a SAN attached disk using the wwn

Hard Drive

Where do I find the wwn of a disk in Windows / HyperV? That’s the question.

There are a number of identifiers to find out which LUN is which disk, but the only undeniably unique number to find out which disk is which LUN is by using the globally unique wwn number of a LUN. The question is: “where can I find the wwn of a disk in HyperV?”

The LUN number, as assigned by the storage array can be found by using diskpart:

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New Dell EMC Unity lineup: Unity XT 380F, 480F, 680F and 880F?

While looking for something totally different I stumbled on a few new Unity XT (?) model numbers.

On this dellemc.com website I spotted some Chinese publication on this new model.

[edit] The new and working website is now working: www.dellemc.com.

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Cisco MDS CLI commands when checking for defects or signal degradation

Cisco MDS

Checking the environment of a switch:

  • show environment temp = what are the temperatures of the intake(s) and outlet(s)
  • show environment power = are the PSUs still working fine?
  • show environment fan = are the fans still working fine?

Checking for errors and signal degradation

  • show interface fc1/10 counters = show all standard counters for port fc1/10
  • show interface fc1/10 counters details = show the detailed counters for port fc1/10
  • show interface counters = show all standard counters for all ports
  • show interface detail-counters = show the detailed counters for all ports
  • show interface detail-counters | i CRC = show the detailed counters for all ports which contain the text “CRC”
  • show interface transceiver calibrations = show the specs of all SFPs
  • show interface transceiver details = show the specs and power details of all SFPs
  • show interface transceiver details | i “x Power” = show the current Rx/Tx power of all SFPs

Common knowledges dictates that fiber optice patches need to be cleaned with proper equipment to prevent unnecessary signal loss. See this blog post for more details on how and why to keep optic cables clean.

How to find out the LUN id of a Windows disk

Hard Drive

Attaching multiple LUNs to a Windows host and later trying to figure out which LUN is which can be a drag. I found out that using the “details disk” command in diskpart can help you finding backup the right LUN:

 

diskpart

list disk

select disk 19 (or whatever drive you want to see the details of)

detail disk

HITACHI DF600F  Multi-Path Disk Device
Disk ID: 00000000
Type   : FIBRE
Status : Online
Path   : 0
Target : 2
LUN ID : 7
Location Path : UNAVAILABLE
Current Read-only State : Yes
Read-only  : Yes
Boot Disk  : No
Pagefile Disk  : No
Hibernation File Disk  : No
Crashdump Disk  : No
Clustered Disk  : No

There are no volumes.

 

So in this particular case the Host LUN id was 7. This should help you along a bit 🙂