Date: Fri, 9 May 2014 09:17:33 +0300 From: Daniel Braniss <danny@cs.huji.ac.il> To: Karl Pielorz <kpielorz_lst@tdx.co.uk> Cc: freebsd-scsi@freebsd.org Subject: Re: 'Wiring down' iSCSI devices / stop swapping dev nodes... Message-ID: <620EE312-8B43-4E65-A534-6CAA92982CAD@cs.huji.ac.il> In-Reply-To: <88E7AF042B7C82964163CEAF@study64.tdx.co.uk> References: <963D4F6D5D95769A2C8A07D1@Mail-PC.tdx.co.uk> <E526E36E-DCBB-48EE-B574-447469D5AB17@cs.huji.ac.il> <88E7AF042B7C82964163CEAF@study64.tdx.co.uk>
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On May 8, 2014, at 9:32 PM, Karl Pielorz <kpielorz_lst@tdx.co.uk> wrote: > > > --On 8 May 2014 17:12:24 +0300 Daniel Braniss <danny@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
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