Given the time that has passed, I don't think someone with a Dell T5500 has read your post.
In any case, I think it's worth noting that the T5500 and others in this series are purpose built to be workstations. They appear to accommodate two hard drives, standard. That might be enough for you, if you build OMV on a USB thumb-drive. (A thumb-drive, as a boot drive, works very well BTW. The Getting Started Guide is -> here and it will explain the boot drive topic. )
But if you're interested in adding more than 2 drives, I can tell you from experience with a similar sized workstation / form factor, it would be major surgery if it's possible at all. That type of form factor usually results in a very stuffed case with designed airflow. It's not easily altered.
If you have a T5500, or you can get one cheap / free, what I would do is gut the components and put them in a cheap tower case that can accommodate 6 drives. (This -> case is not recommend - it's just an example.) I looked at the spec's for a T5500 and it has 5 SATA connectors at 3GBS. If you're using standard desktop or NAS drives, 3GBS is fine. (Your bottle neck won't be the drives, it will be the 1GBS network.)
If you're looking for a faster controller, this -> thread might worth reading. These HBA's are server grade, 6GBs and fit a PCIe 2.0 X8 which the T5500 mobo has 2 connectors for. But, again, controller speed is not the limiter. It's the network.
Things to note:
Changing cases may cause substantial issues to come into play. For example, Dell's propriety connectors, devices and power supply may not fit a standard case. Modification or replacement of some items may be required. Also, flashing a server grade HBA is not for the feint of heart - it's possible to brick the controller.
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If you can get a T5500, it would probably make a really good NAS in it's stock condition. (Of course, I can't guarantee that.) If you go with big drives (10TB?) that would work fine in the available drive slots. As an example, with 10TB of storage and another 10TB drive for backup, that's a lot of storage and you'd be safe with proper backup. The size of the drives would depend on what you plan to store in the NAS.
Just some thoughts.
but Truenas Jails seem to be much more user friendly than Docker even with Portaine
having used jails on another NAS O/S, personally Docker and Portainer are easier to set up and manage especially if you use stacks + if you check the guides section there's a lot of info in there using stacks.
Would be interested to hear if anyone has tried Truenas
Blasphemer, try asking the same question on their forum about OMV 
As a footnote I was looking on ebay at those T5500 as a possible backup server, put it in the loft and forget about it.
Blasphemer, try asking the same question on their forum about OMV
As a footnote I was looking on ebay at those T5500 as a possible backup server, put it in the loft and forget about it.
These guys always have very reliable used workstations (and servers too).
Blasphemer, try asking the same question on their forum about OMV
Haha. I know. OMV has the 1000 times better community for sure but Nextcloud on Truenas Jail worked after 10mins out of the box.
With Docker+Stacks , it took me 5h, several videos and its still running very slow....
With Docker+Stacks , it took me 5h, several videos and its still running very slow....
Just post the problem in here, there are enough in here that use Nextcloud that could help
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