Youd need to make a backup just in case and boot from a livecd to create the mirror. Create software raid1 with mdadm part 1 david biers. Installing gentoo linux on zfs with nvme drive part 1. Gentoo forums view topic how to do a gentoo install. Dualboot gentoo and windows 7 with biospowered software raid. Gentoo init boot from linux software raid with superblock metadata version 1. We cover how to start, stop, or remove raid arrays, how to find information about both the raid device and the underlying storage components, and how to adjust the. Not to mention, the raid card itself could also fail which is why you would want to need to buy a few of the same. Wait until the metadevices are completely finished before proceeding. The raid device devmd0 is now ready to be used with lvm. First we cover the configuration of the boot loader itself. This howto assumes you are using sata drives but it should work equally well with ide drives. I have a brand new installation that im trying to install grub2 onto 6 disks, in a linux software raid 5 array.
The advantage here is access to uefi, multiple terminal windows, firefox rather than links and easy network setup required for stage3, portage, emerge etc. Software raid 0 on boot disk windows 7 help forums. If the kernel panics because it can not mount the root drive, then the cause is almost certainly that your kernel is missing the mddegradedboot patch see section 4. But, every kernel i have attempted to run since then gives me the following when i try to boot. Software raid for root file system boot using grub 2. How to do a gentoo install on a software raid by chris atwood 1. Number start end size file system name flags 1 1049kb 500mb 499mb esi boot 2 500mb 35. If somethings wrong please feel free to correct it. About the install before you start reading this howto you should read the x86 install instructions several times to become familiar with the gentoo install process. Installing grub2 on gnulinux software raid sinodun. This documentation is free for all to read and use. Since im running linux software raid md, i wanted home to be on raid 6 for my main storage but i wanted boot and to use raid 1. From now onwards, use devmd1 for the boot partition, devmd2 for the swap partition and devmd3 for the root partition.
When the root file system is located on a software raid, an initramfs is necessary for automatic assembly. Also, if youre doing linux raid then the mb chipset raid stuff is immaterial. You certanly want to setup a regular backup scheme for your data. The renaming of software raid devices is something unproblematic here from md0 to md127.
The important part in our new menuentry stanza is the line set rootmd0 it makes sure that we boot from our raid1 array devmd0 which will hold the boot partition instead of devsda or devsdb which is important if one of our hard drives fails the system will still be able to boot. So for various reasons i wanted to install gentoo utilizing full disk encryption with luks except for boot ofc, mdraid, gpt and grub2 im mostly writing this for myself as copypaste kind of notes, but posting it in case anyone else is looking to do the same kind of installation too. On raid5, the chunk size has the same meaning for reads as for raid0. The linux software raid driver will start creating the metadevices. Im currently booting from devsdb which i made bootable with unetbootin and a gentoo live dvd image.
Gentoo hardened on software raid howto toms basement. Live environments and stage archives can be downloaded using the links below. From now onwards, use devmd1 for the boot partition, devmd2 for the swap partition and devmd3 for the root partition right before chrooting, dont forget to copy over etcnf to mntgentooetc when youre configuring your kernel, make sure you have the appropriate raid support in your kernel and not as module when installing extra tools, emerge sysfsmdadm as well. If youre not running alpine from a hard disk install, use. Gentoo installation with raid, lvm, luks and systemd. Name flags part type fs type label size mb sda1 boot primary linux raid autodetect 509. Note that the situation is completely different in grub 1 and grub 2. Grub needs the first 2mb at the start of an mbr disk, or a partition of its own on. Installation of grub2 software as the boot loader of the system. Nas or desktop hdd for raid 1 or windows software raid hi, i want to buy two new hdd for my raid 1 mirror in desktop to store my data. The gentoo wiki has information that discusses both grub 1 and grub 2. Details contents, hashes, and signatures minimal installation cd, hybrid iso, stage 3. Basically, all the steps that would normally be performed from a gentoo console and gentoo boot disk, are performed from a gnome 3 terminal in fedora.
I dont use an initramfs so they all need to be in the kernel for raid autodetection to work at boot time. Raid 10 is the fastest raid level that also has good redundancy too. How to install windows 7 onto a software raid array. From now onwards, use devmd1 for the boot partition. Gentoo raid installation and other sundry ways to wack your box by g. Your boot partition should either not be on raid, or else be on a. Minimal installation cd 20200223 348 mib hybrid iso livedvd 20160704 2 gib. Creating a raid1 using mdadm have your two disks ready. I created a boot partition that goes to md0p4, but it. To use the raid array in etcfstab at boot, mdadm service must be started at boot level. How to set up software raid1 on a running system incl. It looks like currently most os installers insist on putting boot on a nonraid partition or the kind of raid1 partition that looks like a nonraid partition, even the installers that support raid5 and grub2 im guessing this limitation is a historical relic leftover from grub1. After an extensive research on linux software raid yes, thats the first time im doing software raid on linux, i have created the raid arrays, however, i dont understand why the md0, md1 and the md2 arrays are pointing such small sizes. I would think the correct partition to install grub2 on would be md0, but it fails to install, there.
Installing gentoo with grub2, gpt, luks and software raid mdraidmdadm so for various reasons i wanted to install gentoo utilizing full disk encryption with luks except for boot ofc, mdraid, gpt and grub2. Installing gentoo with grub2, gpt, luks and software raid. First i need to give a huge shoutout to fearedbliss the gentoo linux zfs maintainer who has an article on the gentoo wiki page talking through the steps to get this all up and running. Maybe now you want to setup linux md software raid for your gentoo. At this point the raid module built into the kernel will try to assemble your raid1 array using a nonexistant drive and your secondary, or mirror, drive. Hi, i have a box with lvm and raid that i had originally built with gentoo linux. The performance counter for the harddisk stays with 5.
I have ide 5 hard drives in a software raid 5 array and one sata drive containing my os partitioned as follows. How do i move a linux software raid to a new machine. If you want to protect against this, you need to merge your swap partitions into a raid that has redundancy eg raid1 or raid5 or create a swap file on a raid partition. There are two important aspects to the configuration of grub2. Youre going to do it using mdadm software raid which then has no impact on what windows does. I have a newly built machine with a fresh gentoo linux install and a software raid 5 array from another machine 4 ide disks connected to offboard pci controllers.
Software raid has its own risks, just like everything else in this world. Boot problems with software raid migrated from gentoo. I have a gentoo machine 64bit with software raid on boot which was set up previously by someone who optimised the kernel for that machine. Ive seen this over the last years and you shouldnt worry about it. The price of this performance boost is some additional cpu usage. Software raid has to be managed by the operating system that is currently running, so to use linux on software raid, linux has to be actively running. This should result in a huge jump in io performance on your system. Gentoo forums view topic unable to create software.
The ubuntu live cd installer doesnt support software raid, and the server and alternate cds only allow you to do raid levels 0, 1, and 5. Grub 1 doesnt know anything about raid, but can fake reading from a raid1 device by reading one of the disks this requires a 0. It was fun to do it, but the performance gain for windows wasnt worth it. Move an existing raid 5 array from ubuntu to gentoo server fault. If you want to use software raid device in your gentoo linux system init boot, not systemd with boot partition resided in the raid for better redundancy but using metadata 1. Now i want to shift the disks to a new machine als. The installation of grub2 software is specific to the type of system, and is covered in installing the boot loader. I am not the best typist this side of stone mountain. My understanding is that grub1 doesnt know anything about raid and so cant boot off any kind of raid array. When a chunk is written on a raid5 array, the corresponding parity chunk must be updated as well. All partitions should be software raided although with one drive only, which i will change as soon as i dont need devsdb anymore for booting, for now devsdb is my fallback in case devsda doesnt boot. Btrfs in raid1 as a root filesystem on gentoo github. Formatpartition the array and then hit reset when it begins to copy files over and boot with the gentoo live cd, delete the windows partition and createformat the linux partitions.
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