Re: RAID5 reconstruction ?
From: John Robinson <hidden>
Date: 2009-05-30 13:35:14
On 30/05/2009 06:44, SandeepKsinha wrote:
Hi all, Say If I have a RAID 5 array of 50GB of five disks of 10GB each. I have data of 5GB. When a disk fails and replaced with a spare disk. Will the reconstruction happen only for the 5GB allocated disk blocks or it will happen for the whole disk size.
The whole disc size, for now anyway; md does not currently note which blocks have been used by its client (the filesystem, LVM, whatever).
Is it possible to make reconstruction intelligent enough to keep it optimized ?
This has been discussed in combination with supporting SSD drives' TRIM function, and would mean md had to keep track of used chunks or possibly even sectors using a bitmap or something like that, but whether anyone's working on it I don't know. Cheers, John.