Tag Archives: EMC

VNX DPE / DAE SAS cabling

A quick note to clarify SAS cabling between EMC VNX and extra enclosures or DAE’s as they are called.

When setting up a VNX with only the base DPE enclosure, there’s no need for cabling.

When adding the first and the second enclosure, you need a special kind of SAS cable, called the “mini-SAS to mini-SAS HD cables”.

When adding a third enclosure or more, you need a “mini-SAS to mini-SAS cable”.



The following is an overview on the partnumbers for both situations:VNXSAS




Dell EMC Unity unboxing

This week we received our Dell EMC Unity (all-flash) demo machine.
Some time ago I already certified to perform EMC Unity implementations and in the meantime I already went onsite with customers to install several boxes.

Unity is SIMPLE, Unity is MODERN, Unity is AFFORDABLE, Unity is FLEXIBLE and therefor the ideal unified storage offering from EMC, now DELL EMC for mid-market today.
You get a flexible storage systems for SAN, NAS. You get things like snapshots, replication, thin provisioning, file, block, vvols, encryption, autotiering, fast cache…. you get a flashy front and some blue flashing lights ūüėČ

With this article I want to show you how the EMC Unity arrives and what’s next, so let’s start…

  1. First there was a box, only 1 box (except if you order extra disk enclosures of course).
    Inside a flat box containing power cables, front bezel, some labels, tie wraps and a quick-start.
    Below all of that, the actual EMC UNITY wrapped and protected in plastic.tla-unity-1tla-unity-2
  2. There you have it, all unwrapped, on the desk in front of you.
    This demo machine is the ALL-FLASH version with 10x400GB 2.5″ flash drives with 12Gbs SAS back-end connections.tla-unity-4tla-unity-6Looking at the back of this demo machine, we see Storage Processor B on top, Storage Processor A at the bottem, both containing builtin 2x10Gbs RJ45 Ethernet, the Converged Network Adapter with 2x10Gbs Optical Ethernet and 1 IO Flex module with 2x16Gbs Fibre Channel and still 1 slot availble for extra connectivity.
    As you can see, I couldn’t wait and already put in some power cables to give it a go.tla-unity-5
  3. The system comes with a Quick-Start guide which will guide you through the simple process to get the system on the network ready for the final configuration.
    The quick-start provides you with very clear instructions how to put the EMC UNITY in the rack, where to put in the management network cables and which tool to use to perform the basic config (setting the IP) and which admin password to use.tla-unity-8
  4. Up next, discover the DELL EMC UNITY on the network using the “Unity Connection Utility” and setting the IP. Therefor you need a PC.tla-unity-12
  5. The Unity Connection Utility you can download from the EMC website. A very easy small tool to get you up2speed with the system. First it discovers the Unity on the network, next you put in IP address settings and a few clicks and minutes later you are able to login to the management webpage, based on HTML5.tla-unity-15tla-unity-16tla-unity-17tla-unity-18
  6. Here you go, the login page… clean and minimalistic, the way I like it. The quick-start guide provides you with the default password to use, keep it mind that you will be asked to change it.tla-unity-19
  7. Between the time you ordered the Dell EMC Unity and the actual delivery you should have received notice from EMC containing licensing information for the system. If you are new to Dell EMC, you should have registered an online account.
    It’s not my intention to go into details about all of this, so I presume by now you downloaded the EMC Unity License file which is a requirement to be able to continue the install.
    The file should look like this: “CKM00xxxxxxxxxx_2859253_12-Oct-2016.lic”.
  8. The Inital Config starts with the usual introduction and copyright messages.
  9. Next you need to change the ADMIN password and SERVICE password.
  10. Then upload your license file.
  11. next DNS and NTP…tla-unity-24
  12. create a first pool of disks…tla-unity-26tla-unity-27Select the Storage Tiers to use in your pool, in our All-Flash system, of course you don’t have multitiering…tla-unity-28then look for the ideal RAID configuration…tla-unity-29tla-unity-30tla-unity-31tla-unity-32tla-unity-33
    Done with the pool
  13. next, you need to enter email settings & support credentials.tla-unity-34tla-unity-35
  14. To end the initial configuration, you can even already configure iSCSI interfaces and/or NAS server settings.tla-unity-36
  15. Done, ready to go !tla-unity-38tla-unity-39


if you find any typos, well that’s because I wrote this on a friday ūüėČ

Workaround Avamar 6.1.2_47 – repl_cron replication issue – Error writing 32-byte header to cache file

found a bug in Avamar 6.1.2_47 with automatic replication / Repl_cron

Replication seems to fail.
When looking a the /usr/local/avamar/var/cron/replicate.log, you will see following entries:

2013/11/07-20:01:51 avtar Info <5688>: Loading hash cache /usr/local/avamar/var/p_bewetbu11.be.blabla.net-begerbu10-AVI_BACKUPS.dat
2013/11/07-20:01:51 avtar Info <8650>: Opening cache file /usr/local/avamar/var/p_bewetbu11.be.blabla.net-begerbu10-AVI_BACKUPS.dat
2013/11/07-20:01:51 avtar Error <5064>: Cannot open file “/usr/local/avamar/var/p_bewetbu11.be.blabla.net-begerbu10-AVI_BACKUPS.dat”
2013/11/07-20:01:51 avtar Info <5065>: Creating new cache file /usr/local/avamar/var/p_bewetbu11.be.blabla.net-begerbu10-AVI_BACKUPS.dat (1,573,408 bytes)
2013/11/07-20:01:51 avtar Error <5803>: Error writing 32-byte header to cache file /usr/local/avamar/var/p_bewetbu11.be.blabla.net-begerbu10-AVI_BACKUPS.dat.  Possibly out of disk space
2013/11/07-20:01:51 avtar FATAL <5225>: Unable to open hash cache in directory ‘/usr/local/avamar/var’
EMC support confirmed this is a bug in Avamar 6.1.2_47 and should be solved in Avamar 7.
Cause: admin ownership of p_cache files
root@begerbu10:/usr/local/avamar/var/#: ls -l p_*
-rw-rw-rw- 1 dpn   admin  1573408 Nov  5 19:02 p_bewetbu10.be.blabla.net-begerbu10-AVI_BACKUPS.dat
-rw-rw-rw- 1 dpn   admin  1573408 Nov  5 19:29 p_bewetbu10.be.blabla.net-begerbu10-EM_BACKUPS.dat
-rw-rw-rw- 1 dpn   admin  1573408 Nov  5 19:29 p_bewetbu10.be.blabla.net-begerbu10-MC_BACKUPS.dat
-rw-rw-rw- 1 dpn   admin 25166368 Nov  5 19:28 p_bewetbu10.be.blabla.net-begerbu10-begerms1.be.blabla.net.dat
-rw-rw-rw- 1 dpn   admin 12583456 Oct 18 11:42 p_bewetbu10.be.blabla.net-begerbu10-vmwarepc064_UDSJFteNWuob4sn3tVBcLQ.dat
-rw-r–r– 1 admin admin¬† 1573408 Nov¬† 7 16:00 p_bewetbu11.be.blabla.net-begerbu10-AVI_BACKUPS.dat
-rw-r–r– 1 admin admin¬† 1573408 Nov¬† 7 16:38 p_bewetbu11.be.blabla.net-begerbu10-EM_BACKUPS.dat
-rw-r–r– 1 admin admin¬† 1573408 Nov¬† 7 16:39 p_bewetbu11.be.blabla.net-begerbu10-MC_BACKUPS.dat
-rw-r–r– 1 admin admin¬† 1573408 Nov¬† 7 16:37 p_bewetbu11.be.blabla.net-begerbu10-begerms1.be.blabla.net.dat
Workaround: change ownership from admin to dpn account
root@begerbu10:/usr/local/avamar/var/#: chown dpn p_bewetbu11.be.blabla.net-begerbu10-AVI_BACKUPS.dat
root@begerbu10:/usr/local/avamar/var/#: chown dpn p_bewetbu11.be.blabla.net-begerbu10-EM_BACKUPS.dat
root@begerbu10:/usr/local/avamar/var/#: chown dpn p_bewetbu11.be.blabla.net-begerbu10-MC_BACKUPS.dat
root@begerbu10:/usr/local/avamar/var/#: chown dpn p_bewetbu11.be.blabla.net-begerbu10-begerms1.be.blabla.net.dat

reset EMC VNXe admin password and management IP

On the back of the enclosure, you’ll find a password reset button labeled as 2 triangles pointing to each other (see pic).VNXe-back

Press that button with a paperclip for a few seconds, the fault led will start flashing.



When it turns to steady blue, the admin/service password will be reset to default and the system will also allow you to use the EMC VNXe Connection Utility to modify the management ip address.

The default password for the admin account is Password123# and the default password for the service account is service .