iSCSI Targets and VMware

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gkotn
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iSCSI Targets and VMware

Postby gkotn » Fri Jan 08, 2010 4:08 pm

Hello.

I have DS-509+ box attached via iSCSI to 2 VMware ESX 3.5 U4 servers.

The problem is that all defined iSCSI targets on DS509+ box have same LUN ID when presented to VMware hosts and I didn't find any option to change LUN ID. Result is that VMware sees only the first iSCSI target (LUN ID 0) - all the others iSCSI targets are seen as the first one but through different SCSI controllers (SCSI Target 0, SCSI Target 1, ...) - they have different iSCSI names as defined on DS509+ box (iqn.2010-01 ...) but the same size as the first one.

Is there any workaround except that I create one big iSCSI target?

I have effective capacity of 3.5 TB in this NAS box and VMware limitation is 2TB (LUN size, Datastore Size) in ESX version 3.5. I don't wan't to upgrade to vSphere 4 just to be able to see all the capacity.

Are there any changes planned in new release of firmware and if they are, when will it be available ?


Thanks,
Gordan
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Re: iSCSI Targets and VMware

Postby chasler » Tue Jan 12, 2010 11:38 am

Hi,

I have the same issue. For information on vSphere 4 you have the same limitations :
- Only 2TB per iSCSI target
- All synology iSCSI Target have lun 0, son you can only connect the first target!

I hope this issue will be solved by a new firmware (soon...?)
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Re: iSCSI Targets and VMware

Postby gkotn » Thu Jan 14, 2010 9:04 pm

Tnx for the info.

Hopefully someone from Synology would read this post and do something.
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Re: iSCSI Targets and VMware

Postby vm.franklin » Thu Jan 14, 2010 11:54 pm

@all

I'm consulting with our engineers about this, I'll post an update when it is available.

Hope this helps
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Re: iSCSI Targets and VMware

Postby halastrion » Fri Jan 15, 2010 2:28 am

I love this forum... I just installed VMWare 4.0 last week and was trying to figure out how to do this and here is a thread already... Pretty helpful. Hopefully they'll find a fix for the single volume soon...

I'm going to read through the Wiki some more.

John...
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Re: iSCSI Targets and VMware

Postby vm.franklin » Sat Jan 16, 2010 1:01 am

Just as an update for everyone

1. We did change the LUN ID on the iSCSI Targets on the DiskStation - this does not prevent Vmware ESXi 4 from connecting to all the Targets hosted on the DiskStation
1a. User-changeable LUN IDs for iSCSI Targets is on the list for our developers to add in future coming DiskStation Manager firmware
2. Deploying a Fedora 10 with 2 different iSCSI Targets with different LUN IDs did not prevent Vmware from connecting to all of the Targets.

We are still looking into this - please note that a resolution may not come as quickly - as we have seen VMware grab two targets on a regular Fedora computer.

Hope this helps.
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Re: iSCSI Targets and VMware

Postby tris » Tue Jan 19, 2010 5:44 pm

Any update on this issue?
Any way that we can change LUN ID's in a configuration file (through ssh)?

Regards
Tris
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Re: iSCSI Targets and VMware

Postby vm.franklin » Thu Jan 21, 2010 12:19 am

Greetings tris

As stated previously, changing the LUN ID does not resolve the error of ESXi grabbing all of the iSCSI Targets on a Synology DiskStation or even a regular Linux Computer. We are looking at alternative solutions - however I do not believe that these solutions will be available in the short term.

Sorry if this wasn't the answer you were looking for.
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Re: iSCSI Targets and VMware

Postby Devious Dog » Thu Aug 19, 2010 7:16 pm

:evil: I think it is rather stupid that you are allowed to create more than one LUN when the Synology product cannot support it. I am NOT impressed, I have been using Synology boxes for the past 6+ years and currently have a DS409+, renewing my NAS solution every 2+ years. I do thank Synology for the iSCSI LUNs as I run my home ESXi cluster from it, however I did want a logical grouping.. Hence I want a second LUN. May have to swap to a QNAP.
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Re: iSCSI Targets and VMware

Postby HarryPotter » Thu Aug 19, 2010 7:44 pm

Have a look at the DSM 3.0 Beta FW 1285. The iSCSI functionality has been expanded.

http://www.synology.com/enu/DSM3.0/iSCSI_Support.php
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Re: iSCSI Targets and VMware

Postby tshioda » Tue Nov 27, 2012 12:25 am

Hi,

I'm just new on this forum and just read this message. I encounter the same issue, although we are more than 2 years further. When is it expected there will be a fix on this? Or are there any work arounds to create multiple LUNs with different LUN IDs?
Thanks
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Re: iSCSI Targets and VMware

Postby Jon Lockwood » Fri Apr 17, 2015 7:00 am

I see this is a fairly old post but I am having serious issues with my new RS3614xs+ and hope there is a simple solution to the connectivity issues I am experiencing.

The device looks promising via the literature but getting it online in the DC has been nothing but problem free. One of my big problems is that I have 6 esxi5.5 hosts (5 production and 1 dev) and 4 UltraStor RS8-IP4 san devices running in vSphere. Trying to place the RS3614 device on my main iSCSI network but I already have RS8 san's on LUN's 0,1,2, and 6.

I am not a real hard core-storage guru but was shocked that there was no option to assign a LUN ID at the time of creating the LUN in DSM 5.1.

I am able to connect to the device via a separate subnet but my iSCSI subnet is an isolated 10G network and testing real performance requires that I run on the iSCSI network. I equipped the RS3614xs+ with an intel dual 10gbe adapter but it is not very useful on a 1gb subnet.

Is there any way to change the LUN_ID during or after creating the LUN? I have been searching google for an SSH option but have not found anything concrete at this point.

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