ISDCT occasionally reports very high NativeMaxLBA

[Daniel_M_Intel2]

Hi,

We sometimes encounter a problem where ISDCT reports very high NativeMaxLBA. I have logs from Ubuntu 16 (I'm not sure if problem happens on other OSes), where NVMe drive is formatted to atomic format (LBAF 1):

nvme_id_ns /dev/nvme0n1 | grep '(in use)'

# Exit code: 0, duration: 00:00:00.0155966

# stdout:

# lbaf 1 : ms:8 ds:9 rp:0x2 (in use)

isdct show -display Index -intelssd

# Exit code: 0, duration: 00:00:00.1250539

# stdout:

# - Intel SSD DC P3700 Series CVFT42150041400BGN -

# Index : 0

# - Intel SSD DC P3700 Series CVFT42150085400BGN -

# Index : 1

# - Intel SSD DC S3700 Series BTTV227401GB100FGN -

# Index : 2

# - Intel SSD DC S3700 Series BTTV227301HG100FGN -

# Index : 3

isdct show -display NativeMaxLBA -intelssd 0

# Exit code: 0, duration: 00:00:00.1250295

# stdout:

# - Intel SSD DC P3700 Series CVFT42150041400BGN -

# NativeMaxLBA : 9223372036854775807

isdct set -intelssd 0 MaximumLBA=native

# Exit code: 0, duration: 00:00:00.1406744

# stdout:

# Set MaximumLBA successful. Please power cycle the device.

isdct show -display MaximumLBA -intelssd 0

# Exit code: 0, duration: 00:00:00.1250353

# stdout:

# - Intel SSD DC P3700 Series CVFT42150041400BGN -

# MaximumLBA : 781422767

The value displayed in red is max Int64 value. As you can see after setting NativeMaxLBA to 'native' value returns to normal. Any ideas what could cause such behavior?

[idata]

Hello Deix,

I'll like to check this with our engineers. Before I do so, there are a couple of things we need to confirm:

- What's your motherboard model?

- Are the Intel® SSD DC P3700 plugged directly to the motherboard PCIe slots, or are there any devices in between (such as a RAID controllers)? If so, please provide us with the device model.

- We understand you're using Ubuntu 16*. What's the exact version and kernel?

Best regards,

Eugenio F.

[idata]

Hello Deix

We haven't heard from you in a while. Please let us know if there's anything else we can do for you.

Best regards,

Eugenio F.

[Daniel_M_Intel2]

Hi Eugenio,

It busy time for me, hence the delay

The info you asked for:

1. Motherboard in mentioned computer is:

Manufacturer: ASUSTeK COMPUTER INC.

Product Name: RAMPAGE IV EXTREME

Version: Rev 1.xx

2. The drives are plugged directly to PCIe slots

3. We use Ubuntu 16.04 on kernel 4.4.0-28-generic

Hope this info will be useful.

Regards,

Daniel

[idata]

Hello Deix,

Thanks for your reply. I'll review this with a higher tier of support and we'll be back with you as soon as possible.Best regards,Eugenio F.

[idata]

Hello Deix,

Some points regarding your configuration called our attention. Please let us know the following:

- Can you test formatting the drives on a different flavor of Linux*? ISDCT has not been validated on Ubuntu* and the drives are usually tested on Red Hat* and SUSE*.

- Have you tested using a previous version of ISDCT? You upgraded from version 3.0.9 to 3.0.10. The previous version is https://downloadcenter.intel.com/download/27248/Intel-SSD-Data-Center-Tool still available for download.

Best regards,

Eugenio F.