Question

CE 5.5 Fails Install - Minimum Number of Hard Disk Requirements not met


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Hello Everyone;
Anyone tried a fresh install of CE-2018-01-3? I tried upgrading to CE-2018-01-3 from CE-2017.-07-20 and my cluster went to hell in a hand basket. I then decided to recreate the entire cluster with the deployment version of CE-2018-01-3 and ran into the errors pictured below. Please keep in mind that nothing has changed from a hardware perspective.

Hardware Build
32GB USB 3.0 Flash drive (Firmware CE-2018-01-3 inserted into internal USB port)
Dell PowerEdge R710 2x2.93 GHz Six-Core Intel X5670
72GB RAM
H700 HDD Controller
500GB SSD Samsung EVO 850 (Quantity 1 in VD Group presented by H700)
3TB HDD Seagate Constellation (Quantity 2 each in VD Groups presented by H700)

This was a working three node cluster on the previous iteration of the CE firmware. I would appreciate any and all assistance.

Thank you!


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19 replies

Userlevel 7
Badge +25
Search the forum for Dell and or that error and lots of options. Probably the disk analysis logic is not reading the raid Vols right. There is some python code in those parts to help figure out why they might be filtered.
Userlevel 6
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Couple of dell related threads with solutions: thread 1, thread 2, thread 3, thread 4
Badge +7
Thank you for your reply jrack and Primzy. I will investigate the H700 card further and attempt to create RAID 0 volume. I suspect something in this latest's version of the CE software changed as it relates to this issue, I didn't have this problem before. Will report back.

Thanks again.
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By the way each disk is in its own VD Group and configured as RAID-0 as this was the way I had it working before. I will however, confirm that.

Would anyone know if I don't create VD groups for each drive and leave them unconfigured by the H700 card, would the drives be seen by the CE firmware.

Picture attached describes my meaning.

Thanks
Userlevel 7
Badge +25
If your card supports JBOD mode that is preferred over RAID usually. I don't know if that card does though. I thought that Dell didn't allow for JBOD until the r730 generation HBAs.

Personally I think you just need to keep your R0 vols and then use the python script on those posts to dump the inspection metadata to find out why they were filtered out.
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Hi jrack thank you for your reply. You are correct with regard to the H700 allowing JBOD. The VD groups were a work around as I understand it. I will continue to try to identify root cause.

Thanks again.
Userlevel 7
Badge +34
Hi @bigjigger

Were you able to work through this issue? Did any of the replies help? if yes, consider clicking the 'best answer' link in the reply that did help - that will help others in the community find the same content much faster. 👍
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Hi I did some research and discovered that my Dell PowerEdge R710 controller card does not support IT mode ( Pass Through Mode). That said, the only clear path to success is for me to upgrade to the R720, which is a significant investment just to get around this hurdle posed by the software install.
The work around that I am trying to use is installing the 2017 version of CE and then doing a one-click upgrade within Prism. So far I have not had much success as some components seem to break e.g. PRISM CE broke during upgrade. I decided to step away from it for a few days to figure out what to do next. So far it looks like I may have to take a gut punch and go with hat in hand trade in my R710's for 720's. Only had them a few months and they have already lost 50% of their value from the very vendor I purchased them from. 😞
Userlevel 7
Badge +25
You can always buy an aftermarket HBA and plug your tray in. The R620 generation HBA (mine was an H710) doesn't support IT mode either. I use a generic LSI 9207-8i attached to the disk tray in a PCIe slot and no issues (the H710s just sat in their boxes after removal).
Userlevel 7
Badge +25
And as a note you can use the VDs (single disk RAID0 vols best case) if you want, but you may need to hack the pre-reqs python code if the card slows down the SSD VD too much.
Badge +7
Hi jrack;
Thank you for your reply. I am configured in said manner (VDs single disk RAID0) and as stated 2018 CE fails at minimum disk requirement check. Do you have step-by-step instructions as to how I can "hack" the pre-reqs in python code. Such instructions would be greatly appreciated. Please advise.

Thanks 🤔
Userlevel 7
Badge +25
Quick search, but check out the Optional at the end of the below. That is what defines the minimum for the speed tests.

http://www.nutanixpedia.com/p/running-nutanix-ce-on-vmware-workstation.html

3. Modify the SSD & CVM Memory Requirements by editing the “sysUtil.py” file using the following command

vi /home/install/phx_iso/phoenix/sysUtil.py

Modify the SSD IOPS requirements

SSD_rdIOPS_thresh = 1000
SSD_wrIOPS_thresh = 1000
Badge +7
If your card supports JBOD mode that is preferred over RAID usually. I don't know if that card does though. I thought that Dell didn't allow for JBOD until the r730 generation HBAs.

Personally I think you just need to keep your R0 vols and then use the python script on those posts to dump the inspection metadata to find out why they were filtered out.

Actually just saw this message. Although I am not Phyton savy, I would use this as an opportunity to learn and also to explore this option with guidance. Please point me to said scripts.

Thanks
Badge +7
Quick search, but check out the Optional at the end of the below. That is what defines the minimum for the speed tests.

http://www.nutanixpedia.com/p/running-nutanix-ce-on-vmware-workstation.html

3. Modify the SSD & CVM Memory Requirements by editing the “sysUtil.py” file using the following command

vi /home/install/phx_iso/phoenix/sysUtil.py

Modify the SSD IOPS requirements

SSD_rdIOPS_thresh = 1000
SSD_wrIOPS_thresh = 1000

Hmm .... your comment here made me think of something that I didn't consider.

Could it be that, the Samsung EVO 840 being discontinued may very well be the issue?
Also, while editing the sysUtil.py file, is the idea here to reduce the thresh to say 500?

See link to SSD spec ---> https://www.tweaktown.com/reviews/6062/samsung-840-evo-500gb-ssd-review-an-ssd-with-a-good-price-and-performance/index2.html
Userlevel 7
Badge +25
Some folks have had bad experiences with Samsung consumer SATA SSDs (search the forum) so you may still have issues. Don't think the nutants have had the ability to nail down the cause as most folks move to devices either at an enterprise spec or another supplier.

I don't know how many IOPS your HBA can process for a R0 volume so I would probably just do 1 and know that things may get wonky. If the filter was on performance that would get it past that gate.

For the SSD you only need 200G so your 500G SSD VD should be sized fine. Make your your HDD (capacity) volume is sized 500+.
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Hi again;
Thank you for your reply. Will take a look at my options and report back.

Thanks
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I was experiencing the same thing when I installed last weekend.

This fixed it for me. Link
Userlevel 7
Badge +34
Hi @bigjigger - did you see the note from @Nox with a link - let us know how it goes.

If you find a reply that helps - consider clicking the 'like' and 'best answer' link on the reply - that will help others find answers to similar questions much quicker, Thanks 👍
Userlevel 7
Badge +34
Hi @bigjigger did you see the note from @Nox - let us know if that helped any