[geeks] RAID quirks and terminology

Sandwich Maker adh at an.bradford.ma.us
Sun Jun 15 12:29:46 CDT 2014


" From: Lionel Peterson <lionel4287 at gmail.com>
" 
" > On Jun 15, 2014, at 10:25 AM, Mouse <mouse at Rodents-Montreal.ORG> wrote:
" >
" > What did it do if you (say) tried to mirror between a stripe of 3 disks
" > of size 2X and a stripe of 2 disks of size 3X?
" 
" That should result in a 2X mirror across two stripe sets, with 1X wasted space
" on the 3X stripe set, right?

i assume mouse meant 2x larger vs. 3x smaller, so that the stripes
were equal in size.  in principle, mirroring 2 equal metadisks
shouldn't be a problem...

i don't know what disksuite would've done.  it might've required a
priori that all disks be the same size.  certainly if you try to
mirror unequals your result should be the size of the smaller.
likewise if you stripe across n disks you should get a volume size of
n * smallest.  but these alone shouldn't ban mouse's example.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh at an.bradford.ma.us                       and think what none thought


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