This is a placeholder for me comprehending how video encoding works… I’ll update/edit as I become more familiar.. please don’t assume I have any idea what im talking about.
But, basically you have a GOP (group of pictures) and that GOP has a specified number of frames per second. So lets say you have a 30 FPS video, it has 30 frames per second of data, you can have a number of GOP that is different than that though.
So lets say you have a GOP size of 90, but your frame rate is 30 FPS. You will then have 29 P-Frames per I-Frame, For a total of 87 P-frames and 3 I-Frames.
I-Frames are ENTIRE picture, P-Frames are the “guess” at what changed since the last I-Frame. More I-Frames = more bandwidth.
Well RedHat has made it clear they’re going to enforce their horrible application NetworkManager for a role that has been fine for 25 years as some basic text files… so lets disable it one last time before EL9.
Most us devops engineer nerds have to deal with old java versions for things like IPMI and network device configuration tools… New versions of Java literally refuse to work due to security issues… soooo I present to you.. a solution!
Once you’ve done that, simply open the jnlp file with “OpenWebStart” and it will just “work”. You may need to open the settings app for OpenWebStart and select the OpenJDK JVM over Horacle java.
I constantly switch between speakers and headset.. like 5-6 times per day for conference calls and such…. and changing the audio source was super annoying.. SO THIS BECAME A THING.
Automator:
Using MacOS “Automator” and “switchaudio-osx” from Brew I was able to automate switching to my logitech 533 headset automagically. I have this setup on a key binding for control+F13
The code:
on run {input, parameters}
set theSwitch to "/usr/local/Cellar/switchaudio-osx/1.0.0/SwitchAudioSource"
set theSource to do shell script theSwitch & " -c"
try
if theSource = "Built-in Output" then
do shell script theSwitch & " -t output -s \"G533 Gaming Headset\""
do shell script theSwitch & " -t input -s \"G533 Gaming Headset\""
display notification "Audio switched to G533 Headset." with title " Audio Input/Output Switcher"
else
do shell script theSwitch & " -t output -s \"Built-in Output\""
do shell script theSwitch & " -t input -s \"Built-in Microphone\""
display notification "Audio switched to Internal iMac Devices." with title " Audio Input/Output Switcher"
end if
end try
return input
end run
The CentOS kernel is really old… some hardware requires a newer kernel, like intel VROC requires kernel 4.15+ to work properly…
This guide assumes you’ve installed the kernels for the CentOS AltArch kernel repo: http://mirror.centos.org/altarch/7/kernel/x86_64/
#Download latest pxe kernel initramfs
wget http://mirror.centos.org/centos-7/7/os/x86_64/images/pxeboot/vmlinuz -O /tmp/pxeinitrd.img
#Make a directory
mkdir /tmp/pxeinitrd
cd /tmp/pxeinitrd
#Extract the kernel into the folder
/usr/lib/dracut/skipcpio /tmp/pxeinitrd.img | xzcat | cpio -idmv
#Remove the old kernel modules
rm -rf lib/modules/*
#Copy in the kernel modules from your new kernel, in this case its 4.19.84-300.x64_64 or CentOS AltArch
rsync -r /lib/modules/4.19.84-300.el7.x86_64/* lib/modules/4.19.84-300.el7.x86_64/
#Compile the ramdisk..
find . 2>/dev/null | cpio -c -o | xz -9 --format=lzma > /tmp/initrd.4.19.84-300.el7.x86_64.img
#Grab your files and stick em in your pxe directory
cp /tmp/initrd.4.19.84-300.el7.x86_64.img /var/lib/tftpboot/images/centos7/initrd.img
cp /boot/vmlinuz-4.19.84-300.el7.x86_64 /var/lib/tftpboot/images/centos7/vmlinuz
Default Password for EMC XtremIO: XtremIO Management Server (XMS)
Username: xmsadmin password: 123456 (prior to v2.4) password: Xtrem10 (v2.4+)
XtremIO Management Secure Upload
Username: xmsupload Password: xmsupload
XtremIO Management Command Line Interface (XMCLI)
Username: tech password: 123456 (prior to v2.4) password: X10Tech! (v2.4+)
XtremIO Management Command Line Interface (XMCLI)
Username: admin password: 123456 (prior to v2.4) password: Xtrem10 (v2.4+)
XtremIO Graphical User Interface (XtremIO GUI)
Username: tech password: 123456 (prior to v2.4) password: X10Tech! (v2.4+)
XtremIO Graphical User Interface (XtremIO GUI)
Username: admin password: 123456 (prior to v2.4) password: Xtrem10 (v2.4+)
XtremIO Easy Installation Wizard (on storage controllers / nodes)
Username: xinstall Password: xiofast1
XtremIO Easy Installation Wizard (on XMS)
Username: xinstall Password: xiofast1
Basic Input/Output System (BIOS) for storage controllers / nodes
Password: emcbios
Basic Input/Output System (BIOS) for XMS
Password: emcbios
Objective
You want to add 12 additional SSDs to an existing Starter X-Brick (10TB with only 5TB installed) in your environment (less than 12 is not supported, however it is technically possible).
Prerequisites
Valid support contract with Dell-EMC, you will need to access documentation that requires a valid login to Dell-EMC support.
X-Brick is fully functional and connected to an XMS.
Have a copy of the default passwords for XtremIO, I cannot list them here due to the Dell-EMC partner agreement. The accounts you will be using are: tech and xmsadmin. You have to access Dell-EMC support and search for Article number “332100”.
Have access to the XtremIO Management System (XMS).
The “EMC XtremIO Storage Array Software Installation and Upgrade Guide”, “Chapter 9, Expanding a 10TB Starter X-Brick (5TB)” from Dell-EMC supportcovers this in detail. This procedure does cover the mechanism from the UI and SSH. I had problems with the UI method and was forced to use the SSH procedure.
Step 1 – Install the additional SSD drives into the X-Brick Chassis
Open the rack that houses the X-Brick you want to add storage to.
Remove the 12 plastic SSD fillers from slots 13 to 24.
Install the 12 SSD drives into slots 13 to 24.
Step 2 – Login to the XMS UI
The XMS UI will be used to track the SSD drives being brought online via the Alerts & Events screen.
The SSH session in Step 3 will be used to issue the commands to bring each SSD online. It takes approximately 3 minutes per SSD.
Access the XMS UI by opening a browser and entering https://<XMS IP address> from your JumpBox/Laptop. Download the Java applet and launch it. Accept any Java warnings and login as “tech” (get default password from Dell-EMC support). This is a configured XMS instance, you should see the X-Brick cluster in the UI.
Select the Inventory pane of the UI, select the Table View and then select the SSD object. The new SSDs should have a “DPG State” of “Not in DPG” and “Lifecycle State” of “Uninitialized”. The existing SSDs will be “In DPG” and “Healthy” respectively.
Make a note of the X-Brick ID, the DPG ID and the DPG “Useful SSD Space”and “User Space”.
Keep the XMS UI open with the Alerts & Events window selected. This is how the status of each SSD addition will be tracked.
Step 3 – Initialize each SSD and bring Online
Open Putty and SSH to the XMS IP address and login with “xmsadmin” and then with username “tech” (get default password from Dell-EMC support).
Use the command “show-ssds” to get the SSD list of the X-Brick, including the WWN identifiers. The WWN identifier for each slot will be used in the following steps.
Starting from Slot 13, sequentially execute the following commands. Use the X-Brick, DPG and WWN IDs recorded earlier.
Use the command “add-ssd brick-id=”<X-Brick ID>” ssd-uid=”<SSD-WWN>” is-foreign-xtremapp-ssd” to initialize the SSD in the X-Brick. My use-case had SSDs from another X-Brick, so I had to force the command by using the “is-foreign-xtremapp-ssd” flag.
Use the command “assign-ssd dpg-id=”<DPG ID>” ssd-uid=”<SSD-WWN>””to add the SSD to the Data Protection Group (DPG).
Check the XMS Alerts and Events UI to track the percentage of completion for this task.
As each event has completes (it will turn Green with a “Cleared” state), proceed to the next slot, until Slot 24 is reached and completed.
Select the Inventory pane of the XMS UI, select the Table View and then select the SSD object. All 25 SSDs should have a “DPG State” of “In DPG” and a “Lifecycle State” of “Healthy”.
Then select the Data Protection Groups object and verify the DPG “Useful SSD Space” and “User Space” have doubled.
The XMS Dashboard will also show a doubling of Physical Capacity.
