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EMC: Netto / Raw Capacity of an EMC disk

October 20th, 2011 Matthias Pölzinger No comments

Problem description:

As a DBA, System Archtitect or Engineer you are sometimes faced to create the storage layout for database systems. In order to get a detailed picture on how much capacity is available for your system, you have to calculate the netto capacity for your RAID-Level. Unfortunately EMC disks do not provide the same capacity as they are labeled with (independent of the used RAID-Level). In order to calculate the right capacity for your RAID-Level, you have to calculate with the raw capacity of an EMC disk.

 
Problem resolution:

Below you can find a table of EMC Clariion disks and their actual raw capacity:

Disk Size Raw / Usable Capacity
73 GB 66.61 GB
146 GB 133.65 GB
250 GB 230.13 GB
300 GB 268.37 GB
320 GB 297.01 GB
400 GB 366.76 GB
450 GB 402.57 GB
500 GB 458.56 GB
750 GB 687.86 GB
1 TB 917.15 GB
Categories: Clariion, EMC, Storage Tags:

Navisphere: hostname.domain: is not a Managed Host, unable to retrieve Remote Agent Configuration.

Problem description:

You have installed the Navisphere Host Agent and configured the agent appropriately. Navisphere on storage side still has problems to detect the host and displays messages like “hostname.domain: is not a Managed Host, unable to retrieve Remote Agent Configuration.”:



Cause:
Navisphere has problems to contact the host agent. This can have several causes like:

  • Blocked firewall ports
  • Multiple NICs

Problem resolution:
In my case, the problem was caused by multiple installed network interfaces. In this scenario Navisphere Host Agent does not work properly without creating a special configuration file.

If you have multiple NICs, you have to create the agentID.txt file containing the hostname and IP-address to use. Example:

[root@linux01 /]# cat /agentID.txt
linux01.initso.local
192.168.100.101
[root@linux01 /]#

Afterwards restart the Navisphere Host Agent:

[root@linux01 bin]# service naviagent restart
Shutting down Naviagent:                                   [  OK  ]
Starting Navisphere agent:                                 [  OK  ]
[root@linux01 bin]#
Categories: Clariion, EMC, Linux, Navisphere, Storage Tags: