8/18/2023 0 Comments Softraid convert disk to raid 5![]() ![]() You can, from a rescue system, overwrite the RAID superblock and use the -assume-clean option to avoid a rebuild, but you need to use the same superblock version as before (use mdadm -examine … on one of the component devices to find out). ¹ That is tricky, because there is no good way to reduce the number of disks. Set the new number of disks ( -grow … -n4).Add the extra disks to the RAID-5 as spares ( -grow … -add …) If you put 2 x 500gb partitions on the 1TB drives, youll end up with more than n-1 x 500.Convert the array you want to switch to RAID-5 ( -grow … -l5).Run a consistency check on all devices ( /usr/share/mdadm/checkarray …) For each disk, click the pop-up menu in the Role column and choose RAID slice or Spare to designate the disk as a standard member or spare in the set, then.There is no migration path from RAID-1 to RAID-5, except for the special case with two disks, where RAID-1 conveniently is the same as RAID-4 and RAID-5 (because the parity of a single bit is the bit itself), so the migration code just changes the RAID level without touching the data.Īfter converting to RAID-5, you can add more disks to the array - this migration path exists. Assuming, that you use ext4, this goes via: resize2fs ARRAYīecause of the lengthy re-arrangement of the data, it is often faster to delete the RAID1, then create a fresh RAID5 (which still needs to create parity, but which is an easier operation than to re-shuffle all data) and restore the data from a backup. Choose Create a software RAID partition to create a RAID partition as shown in Figure 10.2, RAID Partition Options. However, while it is in progress, you can still work on the machine, but you should expect degraded disk performance.Īfter the grow operation has finished (use cat /proc/mdstat to see its progress), you can resize the file system. Two Blank Drives, Ready For Configuration In Disk Druid, choose RAID to enter the software RAID creation screen. This is the only slow operation, as it needs to move all data on the disks and generate parity. When a disk fails on a RAID 4 or RAID 5 volume, SoftRAID can take the file data from the remaining disks, along with the parity information, and regenerate the. A software RAID is created either by the operating system of the computer or by the software that is running on the product itself. A hardware RAID is created by a built-in RAID controller and is independent of the computer and the operating system. Grow the RAID5 to the number of available DISKS: mdadm -grow ARRAY -n DISKS AKiTiO's data storage products make use of both hardware and software RAID, depending the model. Please note, that unlike for -fail and -remove, you need to specify the full pathnames of the DEVICEs. Now add all the disks again, that were removed in the first step: mdadm ARRAY -add-spare DEVICE DEVICE. Where ARRAY is the ID of the array like /dev/md2 and DEVICE is a partition of that array like sdc2 or sdd2.Ĭhange the size of the RAID1 to two disks: mdadm -grow ARRAY -n 2Ĭhange the type of array from RAID1 to RAID5: mdadm -grow ARRAY -l 5 To do so, repeatedly execute: mdadm ARRAY -fail DEVICE Important! If you have the information you need to be stored on disks, you must first save it somewhere else.Īfter the conversion and creation of RAID 5, the disks will begin the resynchronization process.Upgrading an N-disk RAID1 to an N-disk RAID5 is possible, though a bit tedious: ![]() Since in our example the disks are empty, click " Yes". After the wizard closes, a message will appear informing you that the discs need to be converted and that all information will be permanently deleted. The duration of this process depends on the volume of disks. Assign a letter to the new volume and a name, as well as a file system:Ħ. After the conversion and creation of RAID 5, the disks will begin the resynchronization process. Following the instructions of the wizard, let's add all our 4 disks to one RAID.ĥ. Inside the Disk Management program, you need to right-click on one of the unpartitioned disks available to us and select the required type of RAID.ģ. In this article, we will look at how to create RAID 5, since creating other types of RAID (volumes) differs slightly.Ģ. ![]() You can do this by right-clicking on the " Start" button and selecting " Disk Management" there:Īvailable RAID types, by default, are RAID Ø (rotateв volume), RAID 1 (mirrored volume), RAID 5, and JBOD (composited volume). First you need to go to the " Disk Management" panel. ![]()
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