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Components can be explicitly given or can be searched for. Mdadm has several major modes of operation:Īssemble Assemble the components of a previously created array into an active array. Other normal arrays (RAID1 etc) can be created inside the container. So when mdadm creates a CONTAINERĭevice, the device just represents the metadata.
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With a CONTAINER, there is one set of metadata that describes all of the arrays in the container. Over the first half of each device, and a RAID0 over the second half. For example, two devices in a 5-device set might form a RAID1 using the whole devices. The set of devices may contain a number of different RAID arrays each utilising some (or all) of the blocks from a This is similar to the set of devicesĬonnected to a hardware RAID controller. A CONTAINER is a collection of devices that are managed as a set. It provides a layer over a true device that can be used to inject faults.ĬONTAINER is different again.
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Use the Device Mapper based multipath-tools instead.įAULTY is also not true RAID, and it only involves one device. Installations should not use md/multipath as it is not well supported and has no ongoing development.
RAID MONITOR LINUX SOFTWARE
MULTIPATH is not a Software RAID mechanism, but does involve multiple devices: each device is a path to one common physical storage device. RAID10, MULTIPATH, FAULTY, and CONTAINER. Linux Software RAID devices are implemented through the md (Multiple Devices) device driver.Ĭurrently, Linux supports LINEAR md devices, RAID0 (striping), RAID1 (mirroring), RAID4, RAID5, RAID6, Some RAID levels include redundancy and so can survive some degree of device This allows multiple devices (typically disk drives or partitions thereof) toīe combined into a single device to hold (for example) a single filesystem. Md10 : active raid10 sdt sds sdp sdn sdm sdl sdk sdjġ1720536064 blocks super 1.2 512K chunks 2 near-copies Lo and behold, mdadm did its magic, and notified me: mdadm: array /dev/md10 started.Īnd indeed, now, /dev/sd10 is active and resyncing: # cat /proc/mdstat Namely, I used the original RAID 10 disks (including the hot spare - /dev/sds1), and added another blank disk (/dev/sdt1) so the total number of disks in the RAID10 is the expected 8. So, I executed mdadm -create /dev/md10 -n 8 -l 10 /dev/sd Is there a way to monitor the progress of the two rebuilding disks?Įven though the mdadm -assemble -scan -v command reported that two disks were rebuilding, after half a day nothing changed. Mdadm: /dev/md/10 assembled from 5 drives and 2 rebuilding - not enough to start the array.Ĭat /proc/mdstat shows: Personalities : Mdadm: added /dev/sdj1 to /dev/md/10 as 0 Mdadm: added /dev/sds1 to /dev/md/10 as 7 replacement Mdadm: no uptodate device for slot 7 of /dev/md/10 Mdadm: no uptodate device for slot 6 of /dev/md/10 Mdadm: added /dev/sdn1 to /dev/md/10 as 5 Mdadm: added /dev/sdp1 to /dev/md/10 as 4 Mdadm: added /dev/sdm1 to /dev/md/10 as 3 Mdadm: added /dev/sdl1 to /dev/md/10 as 2 Mdadm: added /dev/sdk1 to /dev/md/10 as 1 Mdadm: /dev/sdj1 is identified as a member of /dev/md/10, slot 0. Mdadm: /dev/sdp1 is identified as a member of /dev/md/10, slot 4. Mdadm: /dev/sdl1 is identified as a member of /dev/md/10, slot 2. Mdadm: /dev/sds1 is identified as a member of /dev/md/10, slot 7 replacement. Mdadm: /dev/sdm1 is identified as a member of /dev/md/10, slot 3.
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Mdadm: /dev/sdk1 is identified as a member of /dev/md/10, slot 1. I have an inactive RAID 10, and the output of mdadm -assemble -scan -v |& tail -17 is: mdadm: /dev/sdn1 is identified as a member of /dev/md/10, slot 5.