{"id":503,"date":"2025-10-31T13:02:42","date_gmt":"2025-10-31T10:02:42","guid":{"rendered":"https:\/\/admin.danychrys.ro:4433\/?p=503"},"modified":"2025-11-02T09:34:24","modified_gmt":"2025-11-02T06:34:24","slug":"503-2","status":"publish","type":"post","link":"https:\/\/danychrys.go.ro\/web\/503-2\/","title":{"rendered":"How to Install RAID1 on Ubuntu 24.04"},"content":{"rendered":"

PARTITION HARD DISKS<\/span><\/h3>\n

The first thing we\u2019ll need to do to configure our hard disks is to partition them as Linux RAID auto.<\/span>
\nSTEP1<\/strong><\/span>
\nWe can see our hard disks by using the fdisk command. This will show us how they are named, which we will need for future commands. As you can see in the screenshot below, our disks are called \/dev\/sdb and \/dev\/sdc. These disks are just raw storage at the moment \u2013 they don\u2019t have a partition table or anything else configured.<\/span><\/p>\n

fdisk -l<\/pre>\n
\"\"<\/span><\/p>\n
fdisk shows our two disks that we plan to use for our RAID 1 setup<\/span><\/em><\/span>
\nSTEP2<\/strong><\/span>
\nUse the following command to begin partitioning the first disk. This will open up the fdisk menu. Substitute your own disk name if yours is different.
\n<\/span><\/p>\n
fdisk \/dev\/sdb<\/pre>\n
STEP3<\/strong><\/span>\r\nWe will enter the following commands into the fdisk prompts in order to create a new partition and configure it as Linux RAID autodetect.<\/span>\r\n1. Enter n<\/span> to create a new partition.<\/span>\r\n2. Enter p<\/span> to mark this as a primary partition.<\/span>\r\n3. Enter 1<\/span> for the partition number.<\/span>\r\n4. For first and last sector (2 prompts), just press the enter key for default response.<\/span>\r\n5. Enter t<\/span> to select the partition we\u2019ve just created.<\/span>\r\n6. Enter fd<\/span> to configure Linux RAID autodetect on the partition.<\/span>\r\n7. Enter w<\/span> to write all these changes to the disk.\r\n\"\"<\/span><\/span><\/pre>\n
Partitioning the hard disk<\/em>\r\nSTEP4<\/strong><\/span>\r\nWe now need to do the exact same steps for our second disk. In our case, that would be disk \/dev\/sdc. Repeat Step 2 and Step 3 for your second disk. Afterwards, you should be able to see your newly configured RAID partitions with the fdisk command.\r\n<\/span><\/pre>\n
fdisk -l<\/pre>\n
\"\"<\/span>
\nBoth drives have been partitioned as Linux RAID autodetect<\/span><\/em><\/span><\/p>\n
CREATE RAID DEVICE<\/span><\/h3>\n
Now that we have our hard drives properly partitioned, we can use mdadm to create a RAID device with the following command. Remember that even though we have two hard drives, the system will see them as a single device and mirroring will happen in the background.
\nSTEP1<\/strong><\/span>
\nCreate a RAID array called \/dev\/md0 with this command, substituting your own drive names as necessary.
\n<\/span><\/p>\n
mdadm --create --verbose \/dev\/md0 --level=1 --raid-devices=2 \/dev\/sdb \/dev\/sdc<\/pre>\n
STEP2<\/strong><\/span>\r\nNext, put a file system on the device. We\u2019ll use ext4 in this example.\r\n<\/span><\/span><\/pre>\n
mkfs.ext4 \/dev\/md0<\/pre>\n
STEP3<\/strong><\/span>
\nNow, make a directory to where you can mount the newly created RAID device. And then mount the device there.
\n<\/span><\/p>\n
mkdir -p \/mnt\/raid1<\/pre>\n
mount \/dev\/md0 \/mnt\/raid1<\/pre>\n
STEP4<\/strong><\/span>\r\nYour RAID array should now be accessible at the mount point you defined.\r\n<\/span><\/span><\/pre>\n
cd \/mnt\/raid1<\/pre>\n
We can access our mounted RAID array and also use the df command to view details about it<\/span><\/pre>\n
CONFIGURE PERSISTENT RAID MOUNT<\/span><\/h3>\n
The only issue now is that your RAID mount will not survive a reboot. To avoid needing to manually mount it every time, we can configure the fstab file. We\u2019ll also save our mdadm configuration in the following steps.
\nSTEP1<\/strong><\/span>
\nEdit the fstab file with nano or your favorite text editor,
\n<\/span><\/p>\n
nano \/etc\/fstab<\/pre>\n
and add the following line.<\/span><\/pre>\n
\/dev\/md0 \/mnt\/raid1 ext4 defaults 0 0<\/pre>\n
\"\"<\/span><\/p>\n
Adding the RAID mount to fstab file
\n<\/span><\/em>STEP2<\/strong><\/span>
\n<\/span>Next, use the following command to save your current mdadm configuration.<\/span><\/span><\/p>\n
mdadm -D --scan >> \/etc\/mdadm\/mdadm.conf<\/pre>\n
update-initramfs -u -k all<\/pre>\n
That\u2019s all there is to it. If you\u2019ve made it this far, you should now have a working RAID 1 array that stays mounted even after a system reboot.<\/span><\/p>\n
 <\/p>\n
\n
<\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"
PARTITION HARD DISKS The first thing we\u2019ll need to do to configure our hard disks is to partition them as Linux RAID auto. STEP1 We can see our hard disks by using the fdisk command. This will show us how they are named, which we will need for future commands. As you can see in…<\/p>\n","protected":false},"author":1,"featured_media":526,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-503","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","category-5","description-off"],"_links":{"self":[{"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/posts\/503","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/comments?post=503"}],"version-history":[{"count":24,"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/posts\/503\/revisions"}],"predecessor-version":[{"id":577,"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/posts\/503\/revisions\/577"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/media\/526"}],"wp:attachment":[{"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/media?parent=503"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/categories?post=503"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/danychrys.go.ro\/web\/wp-json\/wp\/v2\/tags?post=503"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}