Question about how to migrate raid0 to raid5
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Hi Neil Brown, Sorry for interrupt you.I'm using linux md raid0 in my server, and it's working very good unless it's outof space recently.
Thanks for you good job. I have two question about linux md, 1. the first one maybe a common one:I install my server /home dir as RAID-0 for speed, this server is usually to code build and development, but recently I need add a 2TB HDD to this md, and I found add disk on RAID-0 is not supported, but I found there will maybe a way to convert my RAID-0 to RAID-5, and then add other disk on the RAID-5 (I don't covert it back).
I sow some patch about md takeover: like md/raid4: permit raid0 takeover md: Fix dev_sectors on takeover from raid0 to raid4/5But I'm a newbie about linux md, can you give a some guide about how to do this or it was not supported ?
My kernel version: Linux 2.6.38-15-server #64-Ubuntu SMP Fri Jul 6 19:08:52 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
mdadm - v3.1.4 - 31st August 2010 2. the second question is about radi0.c : create_strip_zones() function,this function will scan mddev->disks and check them EQUAL size or not, can you give me some guide about where this disks passed to this mddev ?
The reason I ask this question is, I add a new HD, and partition two "Linux raid autodetect" partition on this disk, but I don't know how to add this disk to md1.
So I type: mdadm --add /dev/md1 /dev/sdc and report -EINVAL error.I first tough is I caused by my partition not right, so I partition my sdc to 2 partition, with partition type is "Linux raid autodetect".
and found also failed, so I did some google, and found RAID-0 don't support add disk online.
After did a ubuntu "do-release-upgrade", and reboot, I found kernel will check /dev/sdc, looking at sdc, and then failed to create the zone.
After remove the HD in BIOS, I can success mount the md1 again, so my question is do I need do some mdadm command to remove the /dev/sdc in my md1 (maybe it record the device node in some where ?)
Thanks for you advance. -- BR, Jiejing -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html