– the last line shows that the one disk in the RAID is damaged. The detailed information about the RAID also shows that there are some problems:Īrray Size : 20954112 (19.98 GiB 21.46 GB) When both disks are healthy, the output is. First of all, find out if the disc is damaged and needs to be replaced.įrom the previous command you can see that only one disk is active. If one of the disks in a RAID failed or damaged, you may replace it with another one. I/O size (minimum/optimal): 512 bytes / 512 bytes Recovering from a Disk Failure in RAID, Disk Replacement Sector size (logical/physical): 512 bytes / 512 bytes You can view the brief information using fdisk: Consistency Policy – is the parameter that sets the synchronization type after a failure, rsync is a full synchronization after RAID array recovery (bitmap, journal, ppl modes are available).Spare Devices – number of spare disks in the RAID.Failed Devices – number of failed devices in the RAID.Working Devises – number of working disks in the RAID.Active Devices – number of active disks in the RAID.State – is the current state (clean - it is OK).Total Devices – is the number of disks added to the RAID.Raid Device – the number of disks in the RAID.Used Dev Size – the space size used by devices.Array Size – the size of the RAID disk space.Creation Time – the date and time of RAID creation.Let’s consider the main items in the command listing: You can view more detailed information about the specific RAID using this command: To check the state of all RAIDs available on the server, use this command: #echo 'idle' > /sys/block/md0/md/sync_action Then view the output of the following file: #echo 'check' > /sys/block/md0/md/sync_action To check data integrity in the array, use the following command: How to View State or Check the Integrity of a RAID Array? # nano /etc/fstab /dev/md0 /backup ext4 defaults 1 2 First of all, you have to zero all superblocks on the disks to be added to the RAID: I have two extra disks installed on my Linux server, and I want to create a software mirror on them (RAID1). Libreport-filesystem.x86_64 0:2.1.Ĭreating RAID 1 (Mirror) Using 2 Disks on Linux Installing : libreport-filesystem-2.1.86_64 1/2 Mdadm and the dependent libraries will be installed: Running transaction For Ubuntu/Debian: apt-get install mdadm.For CentOS/Red Hat ( yum/dnf is used): yum install mdadm.To install mdadm, run the installation command: Mdadm: How to Install a Software Raid Management Tool? Mdmonitor: RAID State Monitoring & Email Notifications.How to Add a Hot-Spare Drive to an MDADM Array?.How to Add or Remove Disks to Software RAID on Linux?.Recovering from a Disk Failure in RAID, Disk Replacement.How to View State or Check the Integrity of a RAID Array?.Creating RAID 1 (Mirror) Using 2 Disks on Linux.mdadm: How to Install a Software Raid Management Tool?.Try and minimize the workload on the RAID 5 while it's resyncing because a heavy load will slow down the rebuild. Right-click the missing disk, which no longer has any associated volume, and select Remove Disk. Your RAID 5 volume will now go into a Resyncing state, which can take a long time-it has to repopulate the data/parity information on the new disk to make the RAID 5 volume fault tolerant again.Your new disk will be listed to be used as the replacement.Scroll down to the disk that's missing for your RAID 5 set, right-click it, and select Repair Volume.Ensure that only your new disk is selected to convert and click OK.Once it's initialized, right-click the disk and select Convert to Dynamic Disk.Your replacement disk will be found and you'll be prompted to initialize the disk.Access the Disk Management node of Server Manager.Replace the dead disk with a new on in the server.If you need to replace a disk (like I just did after one of my Western Digital Black drives died after six months), follow the procedure below: If you lose a single disk from the set, no data is lost thanks to the data and parity information on the remaining disks, which can be used to calculate the data on the lost disk. If you're using software RAID 5, you have three or more dynamic disks configured as a single fault-tolerant volume that data and parity information is stored on.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |