Software Raid Question(install new disk with mdraid)
I have 2 harddisks(hda,hdc) and built them as Software RAID array(mdraid) when install FC3.
Now I found that hdc is bad and need to replace. I'm not sure, Can I just replace it with a brandnew disk then mdraid will partition and copy everything for me? or I need to prepare partition table first before replace the old one.
another question is how can I know that mdraid will copy from hda to new hdc(that what I want) or it will copy from hdc to hda.
removing/adding drives to arrays
Hopefully someone will help verify what I am about to say. These commands are found in the Manage mode help/man/info of the mdadm command.
- mark drive to be removed as "failed" if it is not already listed as failed
mdadm /dev/md? -f /dev/hd?
mdadm -D /dev/md? will display the info on the array, mdadm -E /dev/hd? displays pretty much the same info
- remove the failed drive
mdadm /dev/md? -r /dev/hd? removes the failed device from the array, now install the new drive
- hot add the new drive, the new drive will be synched to the drive that remained installed
mdadm /dev/md? -a /dev/hd? adds the drive
Verify the array with mdadm -E /dev/md?
I hope this helps.
Oops, I just realized that you said mdraid. The above is my guess with mdadm. Probably not much help then...
Do you have a mirrored or striped array?
thanks everyone, I try patition new disk the same as another, add partition to array by
mdadm /dev/md? -a /dev/hd?
and now it work.:)
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