Bug 57261 - expand md limit beyond 12 drives
expand md limit beyond 12 drives
Product: Red Hat Linux
Classification: Retired
Component: kernel (Show other bugs)
i386 Linux
medium Severity medium
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Assigned To: Doug Ledford
Brock Organ
: FutureFeature
Depends On:
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Reported: 2001-12-07 18:38 EST by Jim Wright
Modified: 2007-04-18 12:38 EDT (History)
0 users

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Doc Type: Enhancement
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Last Closed: 2003-02-19 11:49:28 EST
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Description Jim Wright 2001-12-07 18:38:54 EST
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.
Comment 1 Arjan van de Ven 2001-12-13 03:53:27 EST
"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....
Comment 2 Jim Wright 2001-12-13 15:48:29 EST
27 would be helpful for us, especially if it is easy to do.

Sounds like going past 27 is something for 8.0.
Comment 3 Jim Wright 2002-10-26 01:31:00 EDT
I haven't tried lately, but is this better in recent kernels?
Comment 4 Arjan van de Ven 2002-10-31 12:38:04 EST
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
Comment 5 Jim Wright 2002-10-31 16:08:39 EST
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.
Comment 6 Bill Nottingham 2003-02-19 11:49:28 EST
> 12 should work in current kernels.

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