[DRBD-user] system freezes with drbd 0.7.21 on kernel 2.6.18

Florian Haas florian.haas at linbit.com
Tue Jan 29 12:10:06 CET 2008

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

> disk=['file:/home/xen2/openex.img,hda1,w','file:/home/xen2/openex_swap.img,

For Xen, using file-backed VBDs in a file system replicated by DRBD is a 
questionable approach. In effect, any write you issue in your domU is sent on 
the following odyssey:

Xen VBD in domU -> loop device in dom0 -> filesystem in dom0 -> DRBD in 
dom0 -> MD in dom0 -> physical disk

whereas what you could do, an what is recommended to do would be

Xen VBD in domU -> DRBD in domU -> MD in dom0 -> physical disk

for configuration details.


: Florian G. Haas 
: LINBIT Information Technologies GmbH
: Vivenotgasse 48, A-1120 Vienna, Austria

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