Date: Tue, 22 Dec 2009 10:36:36 +0200 From: Daniel Braniss <danny@cs.huji.ac.il> To: Miroslav Lachman <000.fbsd@quip.cz> Cc: freebsd-scsi@freebsd.org Subject: Re: iSCSI initiator and Dell PowerVault MD3000i Message-ID: <E1NN0EO-000Jyv-Mq@kabab.cs.huji.ac.il> In-Reply-To: <4B2FB9B4.7030401@quip.cz> References: <E1NMgJp-000587-VZ@kabab.cs.huji.ac.il> <4B2FB9B4.7030401@quip.cz>
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> Daniel Braniss wrote: > > [...] > > > it would be helpful if you can describe what you are trying to accomplish. > > To make it short: > I am trying to connect FreeBSD 7.2 machine to storage array Dell PV MD3000i. > MD3000i has 2 controllers to accomplish multipath fail-over in case of > failure of anything in the path (controller, ethernet cable, switch etc.). > FreeBSD machine is connected by 2 NICs (bce1 and bce3), one crosslink > cable to controller 0, one crosslink cable to controller 1. > As I read on the net, it seems possible to run it in this setup with > Windows, Linux, VMware or XenServer. > > It seems not possible to use it this way on FreeBSD (with gmultipath) > > Example of commands and outputs I tried is available at > http://pastebin.com/f2d9566c4 > > Links to MD3000i documentation of redundancy: > Hardware Redundancy and Failover > http://support.dell.com/support/edocs/systems/md3000i/en/2ndGen/HOM/HTML/using.htm#wp1091611 > > RAID Controller Failover Modes > http://support.dell.com/support/edocs/systems/md3000i/en/2ndGen/HOM/HTML/using.htm#wp1093253 > > You can imagine my setup as the one on this page > http://linux.dell.com/wiki/index.php/Products/HA/DellRedHatHALinuxCluster/Storage/PowerVault_MD3000i/Hardware > Except I have just one node and no switches (directly connected) > > I think there is in-band management commands (management over iSCSI > interface of the MD3000i) used to move virtual disks between controllers > driven by connected host / driver in OS. I tend to believe that this is out-of-band, ie, http. when you connect to the target, you get only virtual disks, ie, da0, da3, etc. this are scsi disks. if there was some scsi-raid, then it should appear as some other device, like tape robots, they have st0 for the tape, and ch0 for the 'robot'. > > I am not too experienced with iSCSI / SCSI, so please correct me if I am > doing something wrong or I have wrong expectations. > > Miroslav Lachman if you are not planning to use the network, ie, you mentioned cross cable, and no switches, then you can get the MD3000 (notice no i :-), and you can then connect it using SAS cable(/s) to a raid controller. We do that here, have a dell PowerEdge 2950, running 7.2 (and soon 8.0) conected to a MD3000. btw, SAS is several times faster than iSCSI. We run ZFS on it and provide NAS services via NFS to several hosts. If you go the network/iSCSI route, you can share virtual disks aming hosts - as long as they are readlony, or move them around r/w between hosts. anyways, all this multipath stuff is tickling my curiosity, stay tuned :-) danny
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