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Forum Discussion
Are RNDU4000 and RNDP400U compatible?
Greetings, Can I place an array from RNDP400U in RNDU4000 and expect them to work safely? I have a damaged unit of the first model and would like to migate my data with the least hassle, and I c...
Thanks, StephenB. You've been very helpful along the years since this tragedy started unfolding.
Would it make a difference to know that the array comes from a device ( RNDP400U) that was converted to OS6 when it was still running? If I upgrade the target device too ( RNDU4000) to OS6, would it eliminate friction?
Lastly, what functionality is missing from RNDU4000 compared to RNDP400U?
I can live with anything probably, except being able to access using ssh and reduced disk size, since my array was comprised of 6GB disks.
The Ultra 4 has the slowest hardware of any legacy x86 ReadyNAS capable of running OS6.
It’s the only legacy x86 ReadyNAS with a single core Atom CPU.
It uses CPUs of the same generation as the Ultra 4 Plus and Pro 4 (the CPU is the main hardware difference between the Ultra 4 and those models). It should support the same disks as those models. If 6TB worked fine for you with the U4P they should also work fine with the Ultra 4.
Whilst the Ultra 4 has less features on RAIDiator-x86 (you can still enable SSH), OS6 doesn’t impose such feature limitations.
Some recommend upgrading to at least 2GB RAM which is the minimum OS6 x86_64 units shipped with.
You need to update the Ultra4 to OS6 using a spare/scratch disk (must not be from your array). You can then power down, remove the scratch disk and migrate to it.
It’s the only legacy x86 ReadyNAS with a single core Atom CPU.
It uses CPUs of the same generation as the Ultra 4 Plus and Pro 4 (the CPU is the main hardware difference between the Ultra 4 and those models). It should support the same disks as those models. If 6TB worked fine for you with the U4P they should also work fine with the Ultra 4.
Whilst the Ultra 4 has less features on RAIDiator-x86 (you can still enable SSH), OS6 doesn’t impose such feature limitations.
Some recommend upgrading to at least 2GB RAM which is the minimum OS6 x86_64 units shipped with.
You need to update the Ultra4 to OS6 using a spare/scratch disk (must not be from your array). You can then power down, remove the scratch disk and migrate to it.
mdgm wrote:
The Ultra 4 has the slowest hardware of any legacy x86 ReadyNAS capable of running OS6.Yes. The Ultra will run slower, but it will have all the feature in the Ultra Plus.
mdgm wrote:
Some recommend upgrading to at least 2GB RAM which is the minimum OS6 x86_64 units shipped with.If you never upgraded your Ultra Plus RAM then you won't need to do this right away. It would be a good idea if you keep the NAS running longer. Unfortunately the Ultra uses different memory than the Ultra Plus
Great! All clear now.
One last question: what does "100PES" in "RNDU4000-100PES" denote?
This is another device that I could buy at a reasonable porice.
All Ultras have the -100 bit.
Some NAS (for instance the Pro line) used -100XXX for the early Pioneer version, and then used -200XXX for the Pro released a bit later on. Similarly, the NV+ v2 has -200XXX in it's part number (while the original NV+ has -100XXX).
The PES suffix is a region code. I think PES is Europe, so if you are the UK you might need to get a different power cord.
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