Rich Pieri <[email protected]> writes:
> On Fri, 22 Feb 2013 11:29:42 -0500
> Jerry Feldman <[email protected]> wrote:
>
>> So, assume I have 2 physical volumes, /dev/sda and /dev/sdb.
>> mkfs.btrfs -d raid1 /dev/sda /dev/sdb
>> What happens if I get a failure on /dev/sdb.
>> Assume no snapshots.
>
> "-d raid1" means mirrored data. Metadata is mirrored by default even
> on single drive volumes.
>
> If /dev/sdb faults then you should lose no data since every extent is
> replicated on both /dev/sda and /dev/sdb. If a bit error arises on
> either sda or sdb then a scrub will detect the error and it should
> automatically correct it using the replica on the other device.
I'm sure these are silly questions I could google myself, but: what
happens with more than 2 devices? For example, if I used:
mkfs.btrfs -d raid1 /dev/sda /dev/sdb /dev/sdc /dev/sdd
It this going to be more like raid10?
Also, can you add new devices "later" to an existing FS? E.g., let's
say we start with 2 devices (sda, sdb) -- can I later add more devices?
-derek
--
Derek Atkins, SB '93 MIT EE, SM '95 MIT Media Laboratory
Member, MIT Student Information Processing Board (SIPB)
URL: http://web.mit.edu/warlord/ PP-ASEL-IA N1NWH
[email protected] PGP key available
_______________________________________________
Discuss mailing list
[email protected]
http://lists.blu.org/mailman/listinfo/discuss
