With SSD arriving more and more in our lives it is natural to find it on linux servers too.
Not working with SSD in this area much, haven't found much interest of finding ssd related things in Linux so far.

So, nowadays one can wonder wondering: how would I know if my disks in Linux are SSD or not?
A valid response would be: close the system, open it up and see what disk you have there :)))

But what if this is a linux server far far away? You need to be able to find out these things from OS level.

So, we need to increase the following OCFS2 partition which sits on a drbd volume (which sits on lvm2 volume).
The grow steps have to be taken in the right order: lvm2, drbd and ocfs2.

This tutorial comes in text (below) and in youtube video (also below).
Enjoy ;)

1. Increase LVM partition on ALL NODES

Command: lvresize -L+20G /dev/dockervg/data

I got this error today while trying to upgrade some php application:

Fatal error encountered: /var/www/html/libs/Zend/Db/Statement/Pdo.php(292): Allowed memory size of 134217728 bytes exhausted (tried to allocate 20480 bytes)

UPS :) Quick! Go check your memory limits... pull your hair out, run around the house senseless! WE ARE DOOMED!
Well, the fix is easy. Read on (or watch the video).

1. Confirm the current php memory limit:

# php -r "echo ini_get('memory_limit').PHP_EOL;"

I have moved last month from home made redneck style rack shelves to a very nice servers cabinet from LanKATT.
This model I have seen with different brands with just minors differences.
So this tutorial is applicable basically to all racks with same components.

Hope you find this useful and if yes, subscribe and thumbs up. Thanks ;)

Hello guys,

In this article I will show you personal thoughts and tests regarding this HDD enclosure from Raidsonic: Icy Box IB-3805-C31.

I have bought Qnap TR-004 recently to use it as simple external enclosure with disks set in individual mode for a linux server. In other words: I had all disks visible separately in the system.
Unfortunately I had to return it for 2 reasons, important for my needs:

1. Inserting or removing a disk interrupts the USB connection with the computer

How to list network adapters:

[root@mini:~] esxcli network nic list
Name    PCI Device    Driver  Admin Status  Link Status  Speed  Duplex  MAC Address         MTU  Description
------  ------------  ------  ------------  -----------  -----  ------  -----------------  ----  -----------
vmnic0  0000:01:00.0  ntg3    Up            Up            1000  Full    68:5b:35:7f:07:8d  9000  Broadcom Corporation NetXtreme BCM57766 Gigabit Ethernet

Of course, the easiest way would be to use rufus via windows but if you do not have a windows around, you need a different approach.
Under macOS there is balenaEtcher but for unknown reasons it doesn't detect the ESXi image as bootable and the result is not bootable either.

What's left is a manual approach, via terminal, that should work under macOS or Linux.
Below is a way to do this under macOS. Under linux is not that different: you need to use fdisk -l instead of diskutil list.

Short and sweet: you need to create a bootable ESXi USB stick and the "normal" method was not doing it.
In my situation, I was using balenaEtcher but even if it was successful, the USB stick was not bootable. The tool did warned me when I have selected the ESXi iso.

So here we are. In order to create a bootable ESXi usb stick, you need to have:
1. ESXi iso image from vmware website (https://my.vmware.com/group/vmware/evalcenter?p=free-esxi7)
2. An empty USB stick.

Seeing this when running dmesg?