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If the recovery starts but then stops abruptly at 25%, chances are that the other RAID1 disk member has some serious problem reading from its sectors. Anyway, I strongly suggest you to visit the Linux MDRAID mailing list to directly ask about your problem.


mdadm(8) sez: The GROW mode is used for changing the size or shape of an active array. [...] Currently the supported changes include [...] convert between RAID1 and RAID5, between RAID5 and RAID6, between RAID0, RAID4, and RAID5, and between RAID0 and RAID10 (in the near-2 mode). So, going from RAID1 to RAID0 doesn't appear to be ...


You can't do it with mdadm, but if you're using LVM, you can use lvconvert to make an existing LV mirrored with no downtime and only copying the data once.


Almost certainly not. Every RAID system I'm aware of takes some of the disk space to store its metadata and superblock, and that cuts into the space available to store files. If you had the disk partitioned in "just the right way", you could, theoretically, do it without an extra copy, but it would require an extensive amount of knowledge about how the ...


I agree. Except you don't have to run parted on md0, just create a partition. # mdadm --create /dev/md0 --chunk=2048 --level=6 --raid-devices=10 /dev/sda /dev/sdb /dev/sdc /dev/sdd /dev/sde /dev/sdf /dev/sdh /dev/sdi /dev/sdj /dev/sdk # mkfs.xfs -L /big_raid -b size=4096 -d agcount=64,sunit=4096,swidth=32768 /dev/md0 From my experience, changing block ...


A 2-disk RAID10 is useful for one, and only one, kind of access: single-threaded, sequential, large-block IO read requests. In that specific scenario, it behave similarly to a RAID0 setup. For all other uses, (random read/writes, multithreaded access, ecc) a simple, cleaner RAID1 array is better due to significantly less head seeks (which are very expensive ...


Well, as the second link you provide suggests there's no certainty that mirrored stripes are on separate disks - so to be honest the concept is worthless and dangerous.

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