[DRBD-user] backing_dev length value limited to 128 bytes

Andreas Kurz andreas.kurz at linbit.com
Thu Feb 25 13:53:30 CET 2010

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


On Thursday 25 February 2010 12:10:40 Christian Iversen wrote:
> On 2010-02-25 10:21, Andreas Kurz wrote:
> > On Wednesday 24 February 2010 14:28:38 Alexander Winkler wrote:
> >> Hello,
> >>
> >> I am curious if it would be possible (perhaps in a future version) to
> >> increase the max length for the backing_dev name to more than 128 bytes
> >> (maybe 255 bytes?)? In my current setup there are iscsi-targets whose
> >> names are generated by udev in the following manner, therefore
> >> exceeding the length-limitation:
> >>
> >> /dev/disk/by-path/ip-x.x.x.x:3260-iscsi-iqn.2001-05.com.equallogic:0-8a0
> >>906 -9f4e88005-913000000484b842-xxx-sda-lun-0
> >>
> >> If this is not possible, any thoughts on how to circumvent this
> >> problem?
> >
> > use /dev/disk/by-id/ paths in your config
> 
> But by-id paths look non-sensical with iSCSI. For instance, they could be
> 
> /dev/disk/by-id/scsi-1494554000000000000000000030000005f4100000d000000
> 
> where the by-path name is very descriptive:
> 
> /dev/disk/by-path/ip-10.0.0.120:3260-iscsi-iqn.2009-09.org.sikkerhed:sikker
> hedorg-swap-lun-10
> 
> In fact, how is it even possible to determine what disk
> you need when using by-id paths? I don't know one.
> 

e.g. # scsi_id -g -s /block/sdx

... where sdx is the destination of the disk/by-path link. 

Regards,
Andreas  



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