Red Hat Bugzilla – Bug 57261
expand md limit beyond 12 drives
Last modified: 2007-04-18 12:38:37 EDT
Description of problem:
the current implementation of the multiple devices subsystem
limits md devices to 12 drives, including spares. the man page
for raidtab indicates that a patch to extend this to 256 drives
exists. please consider applying this patch to future kernels.
"12" is a bogus limit indeed; the real limit is 27 and we're evaluating if a fix
for that is enough to warrant a raidtools erratum. Above 27 is not possible
without changing the on-disk format and as a result is rather more invasive....
27 would be helpful for us, especially if it is easy to do.
Sounds like going past 27 is something for 8.0.
I haven't tried lately, but is this better in recent kernels?
current limit still is 27 ;(
there is a on-disk layout change required for going above that, and THAT needs
upstream buy-in and such
sorry for not being clear. I haven't tested lately if the limit of 12 has been
removed so the 27 limit can be reached. I agree that exceeding the 27 limit is
an upstream issue and not an easy question.
> 12 should work in current kernels.