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#Dokumentation u boot how to#
#Dokumentation u boot install#
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Provided the RAID is working fine this can be fixed with: sudo update-initramfs -k all -uįor those that want full control over the RAID configuration, the mdadm CLI provides this. Swap space doesn't come up, error message in dmesg start your server and see if your server can boot from a degraded disk.remove the power and cable data of your first drive.You also can use #dpkg-reconfigure mdadm rather than CLI!.Additionally, this can be specified on the kernel boot line with the bootdegraded=.# Please provide URL to support claim: (this option is not supported from mdadm-3.2.5-5ubuntu3 / Ubuntu 14.04 onwards) change "BOOT_DEGRADED=false" to "BOOT_DEGRADED=true".If your server is located in a remote area, the best practice may be to configure this to occur automatically: If the default HDD fails then RAID will ask you to boot from a degraded disk.

#Dokumentation u boot install#

In case your next HDD won't boot then simply install Grub to another drive: grub-install /dev/sdb Filesystem and mount points will need to be specified for each RAID device.Repeat steps 3 to 7 with each pair of partitions you have created.Select RAID type: RAID 0, RAID 1, RAID 5 or RAID 6.Once you have completed your partitioning in the main "Partition Disks" page select "Configure Software RAID".Repeat steps 2 to 5 for the other hard drive On / partition select "bootable flag" and set it to "on"Ħ. Ubuntu will create 2 partitions: / and swap, as shown below:ĥ. Select the "FREE SPACE" on the 1st drive then select "automatically partition the free spaceĤ. Select your hard drive, and agree to "Create a new empty partition table on this device ?"ģ. Select "Manual" as your partition methodĢ. Warning: this will remove all data on hard drives.ġ. If you want to use some other RAID level for most things, you'll need to create separate partitions and make a RAID1 device for /boot. Warning: the /boot filesystem cannot use any softRAID level other than 1 with the stock Ubuntu bootloader. Install Ubuntu until you get to partitioning the disks Enough drives to meet the requirements of the RAID.

#Dokumentation u boot how to#

Read Getting Ubuntu Alternate Install disk and How to do a Ubuntu Alternate Install If you're building a desktop then you need the "Alternate" install ISO for Ubuntu.

If you're building a server, the server install ISO includes the necessary options.

This is a form of software RAID using special drivers, and it is not necessarily faster than true software RAID. Hardware RAID is generally faster, and does not place load on the CPU, and hardware RAID can be used with any OSįakeRAID: Since RAID hardware is very expensive, many motherboard manufacturers use multi-channel controllers with special BIOS features to perform RAID.

Hardware-RAID: A special controller used to build RAID.

Software-RAID: Where the RAID is created by software.

Prevent data loss in case of drive failure: For example RAID 1, RAID 5, RAID 6, and RAID 10.

If you have 2 x 500 GB HDD then total space become 1 TB. RAID is a method of using multiple hard drives to act as one.

Swap space doesn't come up, error message in dmesg.