[DRBD-user] device size limit now <= 4TB for DRBD disk on DRBD > 0.7.3

Lars Ellenberg lars.ellenberg at linbit.com
Sat Sep 4 10:58:14 CEST 2004

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

On Wed, Sep 01, 2004 at 04:07:01PM +0200, Helmut Wollmersdorfer wrote:
> Philipp Reisner wrote:
> >There are several Limits involved:
> >1. The 32bit overrun in DRBD's size determination code.
> >2. The limit in the kernel's vm - space. Limiting the memory for the 
> >bitmaps.
> >3. Current meta-data layout allows 3.8TB per device.
> >(1) will be fixed rather soon. 
> ACK. Allowing overruns (=> wrong data, unpredictable side effects, 
> crash) is IMHO a bug. According to usual classification systems, a bug 
> causing data damage or crash has severity critical.

this is fixed now.
I just did some configure tests including Philipps recent patches,
and yes, no problem anymore to configure (almost) 4TB:

 | drbd: initialised. Version: 0.7.3 (api:76/proto:74)
 | drbd: SVN Revision: 1530M build by lge at linux, 2004-09-04 00:33:21
 | drbd: registered as block device major 147
 | drbd0: Creating state block
 | drbd0: resync bitmap: bits=1040187392 words=32505856
 | drbd0: size = 3968 GB (4160749568 KB)

 	Lars Ellenberg

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