Subject: [PATCH 000 of 5] md: Introduction
Date: Tuesday 17th January 2006 06:56:04 UTC (over 11 years ago)
Greetings. In line with the principle of "release early", following are 5 patches against md in 2.6.latest which implement reshaping of a raid5 array. By this I mean adding 1 or more drives to the array and then re-laying out all of the data. This is still EXPERIMENTAL and could easily eat your data. Don't use it on valuable data. Only use it for review and testing. This release does not make ANY attempt to record how far the reshape has progressed on stable storage. That means that if the process is interrupted either by a crash or by "mdadm -S", then you completely lose your data. All of it. So don't use it on valuable data. There are 5 patches to (hopefully) ease review. Comments are most welcome, as are test results (providing they aren't done on valuable data:-). You will need to enable the experimental MD_RAID5_RESHAPE config option for this to work. Please read the help message that come with it. It gives an example mdadm command to effect a reshape (you do not need a new mdadm, and vaguely recent version should work). This code is based in part on earlier work by "Steinar H. Gunderson"