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  1. J

    Question about Disable E-core on DELL Precision 3660

    Multi Core Support - Active Cores I saw this initially but doesn't trust that this option would allow to disable E-core. Because in the similar Alienware Aurora R13 with 12th gen (different motherboard), the manual states that
  2. J

    Question about Disable E-core on DELL Precision 3660

    Hi all, I was wondering if there is any user report whether E-core of i7-12700K on DELL Precision 3660 can be disabled in DELL BIOS. Because there are research software that we use that doesn't support E-core, but we still want 12th gen and 8C/16T of P core. Thanks!
  3. J

    Mellanox ConnectX-3 slow transfer speed

    Hello, I have tested a couple of MCX-311A card (latest driver and firmware) under Mint(Ubuntu) Linux with iperf. They work fine (9.x Gbit/s). I have tested these cards in a fresh-install Win10 21H2 (all default) on a Optiplex 9020. The iperf is about 8-9Gbit/s. When I test these cards in a...
  4. J

    Lenovo 430-8i 430-16i HBA (LSI 3408, 3416) with ZFS

    Thank you so much! I knew that I would get a good answer here. TrueNAS forum sometimes could be a bit too "religious" about cross-flash vanilla IT-firmware:p. I understand that they want to be on the "safe" side for ZFS newbies, so they insisted on vanilla LSI firmware or LSI HBA cards. BTW...
  5. J

    Lenovo 430-8i 430-16i HBA (LSI 3408, 3416) with ZFS

    Hi all, In my previous post, I mention that our research lab's mini server room and needs a small storage server running TrueNAS. I got initial quote from Lenovo and will also try DELL and ixSystem later. I think I might get a more accurate answer here and people are generally very...
  6. J

    Seek suggestions for server room set up

    Very good advice. I will be more upfront about this to my professor and lab members so that they have right levels of expectations. Maybe 3rd Proxmox server (less powerful) to have Promox running at high availability mode at its final form. Also try to have most computing needs runnable on...
  7. J

    Seek suggestions for server room set up

    Agree 100%! I will explicitly tell my professor that he needs long term person to maintain it. Also I will tell the lab members to have a realistic expectation. These things that I built is a supplement and convenience for the lab member to increase their work efficiency. They should reserve a...
  8. J

    Seek suggestions for server room set up

    (1) I wish I could, but the switch runs the whole floor is gigabit. (2) I assume that "Intrusion Detection" is ready provided by the University firewall. I can maybe set MAC and IP filtering at the router to only allow our lab computer to access lab-LAN University has a VPN. I can connect to it...
  9. J

    Seek suggestions for server room set up

    I agree 100%. I am off the hook in a year as I will graduate next year. We have a new long-term PhD student who is seasoned in IT. Our current headache is that when using University's cluster, the wait time is long, data space is limited, we could easily wait a month just to get a package...
  10. J

    Seek suggestions for server room set up

    Thank you very much of the detailed suggestions. Here is my comments and rationale. In my drawing, all wall receptacles are on dedicated circuit and its own breaker. Things that I need to decide and tell the contractor early next week is: How many wall receptacles (what voltage) and its...
  11. J

    Seek suggestions for server room set up

    In general, I am seeking suggestions and validation of my design to avoid any major design flaws. From your comment, I guess we don't need firewall like pfsense since the firewall is already provided by the University. To allow VMs get IP addresses without affecting existing University...
  12. J

    Seek suggestions for server room set up

    Reserve for future updates. The server room: Closed 20 sq ft room with heavy duty door, its own thermostat, supply and return air duct. No one work in it for extended time. The building: 12 floors, 5 elevators, new HVAC, renovated 3 years ago. No generator, but building power are very stable...
  13. J

    Seek suggestions for server room set up

    Hi all, I am working for a research lab at a University and we start to have more deep-learning and general computing needs. I am seeking suggestions for finalize the set up. Basically for this project, I volunteered as an "armature" IT consultant. I marked my questions with emojio_O The need...
  14. J

    Mix 10G 2.5G, slow speed, high Retr

    Nice find. I wonder if my surplus Cisco Catalyst Express 500G (with SFP port) can run at 2.5G speed.
  15. J

    Mix 10G 2.5G, slow speed, high Retr

    Update: I end up returned the Mikrotik CRS305 and bought NetGear MS510TX. I let most settings default on MS510TX, and set "Global Flow Control (IEEE 802.3x) Mode" Enabled. 10G can reach 1100MByte/s, 2.5G can reach 280MByte/s. And there is no issue sending and receiving between 10G and 2.5G...
  16. J

    Mix 10G 2.5G, slow speed, high Retr

    Nice. 4 more 2.5G ports compare to NetGear MS510TX
  17. J

    Mix 10G 2.5G, slow speed, high Retr

    Thank you for the information! Is there an example model number of "an Aquantia based SFP+ copper transceiver" that you suggest? Do you by chance have the source of the post about the Aquantia based transceiver? When I bought Mikrotik CRS305, I also looked at QNAP M308 and M408 and thought...
  18. J

    Mix 10G 2.5G, slow speed, high Retr

    I am running switchOS with latest firmware 2.13 (built at Mon Apr 26 2021). I will try routerOS. Update: I switch to routerOS, update to latest stable version. all default settings. The results are the same. Still 160MB/s when 10G is sending and 2.5G intel NIC is receiving.
  19. J

    Mix 10G 2.5G, slow speed, high Retr

    Update: I end up returned the Mikrotik CRS305 and bought NetGear MS510TX. TLDR: It looks like Mikrotik still have pause frame/flow control issue with 2.5/5G, with common RJ45-SFP+ modules (6COM, ipolex, etc..) The only known RJ45-SFP+ module that works at 2.5G/5G is Supermicro...