Updating kernel redhat
mdadm checks that the components do form a bona fide array, and can, on request, fiddle superblock information so as to assemble a faulty array.Typically you do this in the init scripts after rebooting.
This leads to 2 frequent questions: In the absence of any other preferences, do that in the /usr/local/src directory.Eventually you have more devices, which you want to keep as stand-by spare-disks, that will automatically become a part of the mirror if one of the active devices break.Ok, now we're all set to start initializing the RAID. the contents (however unimportant now, since the device is still not formatted) of the two devices must be synchronized. It should tell you that the /dev/md0 device has been started, that the mirror is being reconstructed, and an ETA of the completion of the reconstruction. So, your system should still be fairly responsive, although your disk LEDs should be glowing nicely.Of Course, if the wrong disk breaks while the reconstruction is running, you're out of luck.You have three or more devices (four or more for RAID-6) of roughly the same size, you want to combine them into a larger device, but still to maintain a degree of redundancy for data safety.To change the metadata version (the default is now version 1.2 metadata) add the --metadata option after the switch stating what you're doing in the first place. You have two or more devices, of approximately the same size, and you want to combine their storage capacity and also combine their performance by accessing them in parallel.
This will work: Ok, so you have two or more partitions which are not necessarily the same size (but of course can be), which you want to append to each other. Like in Linear mode, spare disks are not supported here either.
It also cannot perform any checks that appropriate devices have been requested.
Because of this, the Build mode should only be used together with a complete understanding of what you are doing.
The reconstruction process is transparent, so you can actually use the device even though the mirror is currently under reconstruction.
Try formatting the device, while the reconstruction is running. Also you can mount it and use it while reconstruction is running.
This is for doing things to specific components of an array such as adding new spares and removing faulty devices.