'Wiring down' iSCSI devices / stop swapping dev nodes...

[Daniel Braniss]

On May 8, 2014, at 9:32 PM, Karl Pielorz <kpielorz_lst at tdx.co.uk> wrote:

> 
> 
> --On 8 May 2014 17:12:24 +0300 Daniel Braniss <danny at cs.huji.ac.il> wrote:
> 
>> one solution is to use gpart (8)
>> 	gpart create -s GPT /dev/dan
>> 	…
>> 	gpart add -t freebsd-ufs -l d0/p1 /dev/dan
>> 
>> and you can use now
>> 	/dev/gpt/d0/p1
>> 
>> which [should] be true whatever iscsi decides to call device.
> 
> I hadn't thought of that - mostly because the devices underlying the iSCSI are already gparted (i.e. the iSCSI target is a GPT partition on an underlying disk).
> 
> I'm just trying it now - looks like it will work (Ok, it's created - I need to test failure etc.)
> 
> Is there any performance hit from having 'GPT within a GPT' kind of thing going on? - I suppose I could just share out the raw disk (i.e. /dev/daX) via iSCSI and then there'd be only one layer of partitioning going on... I'm not sure if that's a good idea or not :)

just from my guts, I don’t think there is any noticeable overhead, considering that TCP already adds allot, one more indirection
is probably negligible.

danny