Date: Thu, 20 Feb 2014 21:15:57 +0000 From: Steve Burton <steve@sliderule.demon.co.uk> To: Dan Nelson <dnelson@allantgroup.com> Cc: FreeBSD Questions <freebsd-questions@freebsd.org> Subject: Re: iSCSI Backing store Message-ID: <5306708D.6090001@sliderule.demon.co.uk> In-Reply-To: <20140220204526.GE80443@dan.emsphone.com> References: <530661A6.1030606@sliderule.demon.co.uk> <20140220204526.GE80443@dan.emsphone.com>
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On 20/02/2014 20:45, Dan Nelson wrote: > In the last episode (Feb 20), Steve Burton said: >> I'm trying to familiarize myself with the iSCSI implementation in FreeBSD >> 10 REL. I have made a target containing two LUNs which are backed by two >> files on my test server (redundant PC). This all worked well though it >> took ages to make the files using dd. >> >> dd if=/dev/zero of=/targets/target0-0 bs=512 count=31250000 >> >> My first question is, is there a better and quicker way to make the >> backing store files? > > A 512-byte blocksize is suboptimal; you're spending most of your time just > processing the read/write syscalls at that size. There isn't much benefit > to using a blocksize over 64k, but using 1m does make it easy to calculate > the count for large volumes :) > >> My second question relates to making iSCSI LUNs using a disk volume. I >> have a second (empty) hard drive. Is it possible to just use the disk as >> backing store for iSCSI? > > I don't see why not. > > I didn't see why not either but so far I can't see how :) Steve.
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