linux


If you want to build your own disk array, let’s say RAID, on your computer to increase disk space and efficiency, you should know about few important things in general:

  • You can consider MBR and x86 obsolete. New way is GPT, UEFI, AMD64.
  • Large RAID arrays (over 2TB) will not work with older hardware and OS (except FreeBSD) due to architecture limitations.
  • To use large RAID volumes you must use GPT partition scheme. MBR will not do the job.
  • Some systems can use GPT only with UEFI BIOS (i.e. Windows works with GPT only via UEFI). You may be forced to buy new motherboard.
  • UEFI and GPT is totally different way of bootstrap so you can forget what you know about BIOS and MBR here.
  • Hard Drives have hidden corruption-fix mechanisms in firmware that will make your RAID array fail to operate. For RAID choose dedicated drives such as WD RED (not Green, not Black, not Blue).

In order to use GPT and UEFI I have replaced my nice ASUS M4A88TD-V EVO/USB3 motherboard with M5A97 R2.0 only because M4 series did not support UEFI. New BIOS is totally different, but I am not really sure if replacing the hardware was mandatory..

Summing up, if you want to use large RAID volumes make sure first that you can use GPT and UEFI BIOS is present on your AMD64 hardware. If not, still you can use the FreeBSD as it knows how to bypass some limitations. Also remember to use dedicated HDD for RAID operations.

linux


Q: How to change the default boot menu entry in GRUB2 used widely on Linux systems?

A: You can do it easily as root in three following steps:

  1. Run update-grub program and copy entry name that you want to make default.
  2. Edit /etc/default/grub and add or modify existing GRUB_DEFAULT="your_menu_entry_here".
  3. Run update-grub program again to update the grub bootloader configuration.

linux


Lanmanager to prosty system zarządzania dostępem do routera uniksowego, napisany na potrzeby sieci komputerowej, ułatwiający egzekwowanie opłat. W bardzo prosty sposób pozwala udostępnić połączenie internetowe oraz zasoby serwera jedynie wskazanym komputerom z sieci wewnętrznej.

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