Weekly edition	Kernel	Security	Distributions	Contact Us	Search
Archives	Calendar	Subscribe	Write for LWN	LWN.net FAQ	Sponsors

Solid-state drives

Posted Aug 3, 2009 20:31 UTC (Mon) by SEJeff (subscriber, #51588)
In reply to: Solid-state drives by dlang
Parent article: A short history of btrfs

If you raid drives with btrfs it lets you raid the metadata. Actually, doesn't it do this by default now?

(Log in to post comments)

Solid-state drives

Posted Aug 3, 2009 20:41 UTC (Mon) by dlang (✭ supporter ✭, #313) [Link]

what I was thinking of is the ability to use different levels of raid for different types of data.
say raid1 for metadata, raid0 for any files in /tmp, raid5/6 for everything else.

Solid-state drives

Posted Aug 3, 2009 21:01 UTC (Mon) by SEJeff (subscriber, #51588) [Link]

btrfs already supports exactly what you asked:
http://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_M...

By default data is striped accross multiple disks and metadata is mirrored. You can even mirror metadata on a single disk to prevent bad blocks from corrupting your data. Chris and company did a great job in designing this beast.