Hello Neil ,
On Mon, 23 Jan 2006, Neil Brown wrote:
On Monday January 23, hjohn@xxxxxxxxx wrote:
NeilBrown wrote:
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.
I think my question is already answered by this, but...
Would this also allow changing the size of each raid device? Let's say
I currently have 160 GB x 6, could I change that to 300 GB x 6 or am I
only allowed to add more 160 GB devices?
Changing the size of the devices is a separate operation that has been
supported for a while.
For each device in turn, you fail it and replace it with a larger
device. (This means the array runs degraded for a while, which isn't
ideal and might be fixed one day).
Once all the devices in the array are of the desired size, you run
mdadm --grow /dev/mdX --size=max
and the array (raid1, raid5, raid6) will use up all available space on
the devices, and a resync will start to make sure that extra space is
in-sync.
How does one come up with a accurate '--size=max' ?
I thought someone had asked this question before , but the
message where this was mentioned eluded me .
Tia , JimL
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