Some time ago, and occasionally since, we've discussed altering the
"RAID-n" terminology to change it to an "NcMsPp" format, where N is the
number of copies, M is the number of (data) devices in a stripe per copy,
and P is the number of parity devices in a stripe.
The current kernel implementation uses as many devices as it can in the
striped modes (RAID-0, -10, -5, -6), and in this implementation, that is
written as "Xs" (with a literal "X"). The Ms and Pp sections are omitted
if the value is 1s or 0p.
The magic look-up table for old-style / new-style is:
single 1c (or omitted, in btrfs fi df output)
RAID-0 1cXs
RAID-1 2c
DUP 2cd
RAID-10 2cXs
RAID-5 1cXs1p
RAID-6 1cXs2p
The following patch set modifies userspace tools to accept c/s/p formats
in input (mkfs and the restriper). The older formats are also accepted. It
also prints the newer formats by default in btrfs fi df, with an option to
show the older format for the traditionalists, and to expand the abbreviation
verbosely for those unfamiliar with it.
v1 -> v2: Changed to use lower-case letters for c/s/p, for readability
Changed mS to Xs for readability
Added "explain" option to df
Switched option parsing for df to getopt_long
Hugo.
Hugo Mills (5):
Use NcMsPp format for mkfs
Move parse_profile to utils.c
Convert balance filter parser to use common NcMsPp replication-level
parser
Change output of btrfs fi df to report new (or old) RAID names
Add man page description for NcMsPp replication levels
cmds-balance.c | 23 +++----
cmds-filesystem.c | 173 ++++++++++++++++++++++++++++++++++++++++++++-------
man/btrfs.8.in | 16 +++++
man/mkfs.btrfs.8.in | 24 ++++++-
mkfs.c | 35 +++--------
utils.c | 94 ++++++++++++++++++++++++++++
utils.h | 1 +
7 files changed, 303 insertions(+), 63 deletions(-)
--
1.7.10.4
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