Category Archives: Configuration - Page 3

Format of CSV on Hyper-V hosts is very slow

Posted by on April 6, 2018 No comments
Hard Drive

When formatting a newly added disk (LUN) to Hyper-V, often you’ll notice the formatting takes forever. Dell EMC therefore advises to disable VAAI on VMware hosts for the same issue, however modern VMware hosts don’t seem to have this problem. Hyper-V however still have this issue. To disable the UNMAP / TRIM from happening, use the following command:

fsutil behavior set DisableDeleteNotify 1

After formatting was performed, you’ll need to re-enable UNMAP / TRIM by issuing the following command:

fsutil behavior set DisableDeleteNotify 0

 

How to set the DNS server in a Brocade switch

Posted by on October 10, 2017 No comments

In order to do DNS lookups in a Brocade SAN switch (for example to read the NTP server’s time), you need to configure DNS first.

By using the command “dnsconfig”, you can configure which 2 DNS servers the switch can use to do lookups:

dnsconfig

Now you see a 4-item menu:

Enter option
1 Display Domain Name Service (DNS) configuration
2 Set DNS configuration
3 Remove DNS configuration
4 Quit
Select an item: (1..4) [4]

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Cisco DCNM server unresponsive

Posted by on July 17, 2017 2 comments
Cisco MDS

You’re running a DCNM virtual appliance and when you’re trying to log on, it looks like the appliance’s webserver is no longer active.

Connect to the Linux prompt of the appliance and do the following:

Stop DCNM services:

/usr/local/cisco/dcm/dcnm/bin/stopLANSANServer.sh

Open the psql prompt:

/usr/local/cisco/dcm/db/bin/psql dcmdb

log on with root password (user root is assumed)

Type the command:

VACUUM FULL ANALYZE VERBOSE;

This will produce tons of output, but just let it run and eventually it all ends and you just need to start the DCNM services again.

When done, quit the psql prompt:

dcmdb=> \q

Start DCNM services:

/usr/local/cisco/dcm/dcnm/bin/startLANSANServer.sh

Source: cisco.com

Brocade SAN Switch commands that prove to be very useful

Posted by on June 8, 2017 No comments

Brocade commands are usually very easy to find out. Simply type “help” and look for the command you think you need, but what exactly does each command do? Here’s a list:

Info

uptime                          – Same as unix uptime
date                              – Same as unix date
version                          – Gives versions of firmwares & OS

Hardware State

faultshow                     – Show switch faults
fanshow                       – Show switch FAN faults
psshow                        – Show switch POWER SUPPLY faults
tempshow                    – Show switch TEMPERATURE values
switchstatusshow          – Overall status of switch

Config

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How to create a snapview snapshot on an existing LUN

Posted by on May 8, 2017 No comments

I apologize in advance for this (6 years or so too late) post, since it’s for creating a snapview snapshot on a LUN on a VNX. It’s simply meant as a reminder for the command line syntax:

Examples for creating snapview snapshots (it only defines it, no COFW is happening at this point):
naviseccli -h 172.16.20.96 snapview -createsnapshot 17 -snapshotname VMFS-001-SNAP
naviseccli -h 172.16.20.96 snapview -createsnapshot 18 -snapshotname VMFS-003-SNAP
naviseccli -h 172.16.20.166 snapview -createsnapshot 27 -snapshotname VMFS-002-SNAP
naviseccli -h 172.16.20.116 snapview -createsnapshot 5 -snapshotname VMFS-004-SNAP

To start an actual point in time session (and the start of COFWs):
naviseccli -h [ip address] snapview -startsession [session name] -snapshotname VMFS-001-SNAP

To stop a session:
cnaviseccli -h [ip address] snapview -stopsession [session name]

To activate a snapview session (make the data visible):
naviseccli -h [ip address] snapview -activatesnapshot [session name] -snapshotname VMFS-001-SNAP

To deactivate a snapview session (stop presenting the data to the hosts):
naviseccli -h [ip address] snapview -deactivatesnapshot [session name] -snapshotname VMFS-001-SNAP