[DRBD-user] device size limit <= 2TB for DRBD disk on DRBD <= 0.7.3

Jeff Buck jeffb at umci.com
Wed Sep 1 03:08:48 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.


Yeah.. It won't be long before 2T+ is very commonplace... even for cheap
servers. We just built a fairly inexpensive fileserver to use with drbd,
and it's got 1.5T available (and it's like 1/5 the cost of the box it's
replacing).

A 2T system can be put together very easily for under $3000.

Basic "descent" computer w/o drives: $500 (should be easy)
8 port sata raid 5 controller: $480
300Gb sata drives: 8 @ $234 = $1896

$1896 + 480 + 500 = $2876 = 2100 GB system

I know a lot of people that have spent more putting together a personal
computer before.

I suppose you could get around the limit by making 1T drbd devices, and
using lvm to glue them together, but it seems awkward. If we were
upgrading our server just a few months down the road, I'm sure thats
what we'd be looking at since we were just taking the best bang for the
buck approach.


On Tue, 2004-08-31 at 16:27, Helmut Wollmersdorfer wrote: 
> Lars Ellenberg wrote:
> 
> > two drbd with ca. 2TB each will do, probably.  three is unlikely,
> and
> > four of that size is probably not possible currently.
> 
> > this is a known problem, and will eventually be fixed.
> > it does not seem very hard to fix, but as long as we have the
> impression
> > that "the average drbd user" does not use several TB of storage,
> fixing
> > that has low priority...
> 
> Hmm, times are changing very fast. Two years ago I had 12 GB on
> servers 
> and 50 GB in total at home office. Now I have 2 x 240 GB on servers
> and 
> around 1 TB in total.
> 
> At last project they had 27 TB storage system on one server (for _one_
> application) and 17 TB of this mirrored by 11 km fiber to an hot
> standby 
> - not DRBD, obviously.
> 
> Helmut Wollmersdorfer
> 
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