John R Pierce wrote:
Ruslan Sivak wrote:
John R Pierce wrote:
Yes, if two disks belonging to the same mirror go down, I lose my
data. But if two disks which are not from the same mirror go down,
I would like to be able to boot up without any problems. And as
someone else mentioned, what else am I going to do with those
200mb? I'd rather maintain symmetry and not have to worry which
disks /boot is on, as I'll know that if the data drive survives,
then I won't have any problems with the boot drive either.
so, is your / on a 4 spindle mirror too?
N-way mirrors require every write to be done N times.
No, / is on a 2 raid 1 arrays which are striped using LVM. And the N
times write penalty doesn't really apply to boot, since it rarely
gets written to.
so, if the LVM is built from the 2 raid1 sets md1 and md2, and both
drives of md1 are down, its down. ditto if both drives of md2 are
down. so why not just put the /boot on the same spindles as md1 ?
btw, LVM isn't really striping, its more like globbing. or scattering.
Well the reason not to put /boot on the same spindles as md1 has already
been mentioned a few times. Basically flexibility.
What do you mean LVM doesn't really do striping? What does globbing
mean? Does it mean there is no performance difference between striping
LVM and just concatenating 2 raid1's?
Russ
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