On Tuesday July 29, rmichael-raid@xxxxxxxxxxxxxxxx wrote: > I would like to add an internal bitmap to my RAID1 array. It uses > v 0.90 superblocks. > > Reading the man page, I believe I do this with: > > "mdadm --grow --bitmap=internal /dev/mdX" > > correct? Correct! > > How do I know how much space is available on the superblock when mdadm > will perform it's computation "to make best use of available space"? > I'm curious because perhaps I should change to 1.x superblocks in the > future (for non-bootable arrays). with 0.90, there is about 60K guaranteed to be available. This is 491520 bits. With 1.0 there 3K guaranteed to be available, though there might be more. I don't think we use the "more" currently unless you add a bitmap when creating the array. So there is no need to change metadata version for more bitmap space. NeilBrown -- 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
