On Mon, 30 Aug 1999, D. Lance Robinson wrote:
> #define MD_SB_DESCRIPTOR_WORDS 32
> #define MD_SB_DISKS 20
> #define MD_SB_DISK_WORDS (MD_SB_DESCRIPTOR_WORDS * MD_SB_DISKS)
oops. I've just re-checked the superblock layout calculations to prove you
wrong, but actually it turned out that there was a factor of 2 error in
all previous calculations! (done by several people, not only me) - the
actual 'safe limit' for maximum number of disks is 27...
I'll release a new RAID driver probably tomorrow (hopefully) with these
fixes. It looks like the 'big' superblock changes can wait for some time,
27 isnt an all that bad limit after all ...
this is a 100% safe solution - arrays bigger than 12 disks will not be
backwards compatible, but no other problems.
ugh, this is good news indeed for lots of people, thanks Lance for
pointing this out...
-- mingo
