France joined 3 months ago
9 questions
17 comments
Homelab enthusiast from Lyon. Mostly SAN fabrics.
Dell R740xd servers with OEM Intel X710 adapters were cabled to Cisco switches with SFP-H10GB-CU5M and SFP-H10GB-CU3M DACs. Two cables linked, five did not; the working ones carried a blank or V02 version ID (made 2013), the failing ones V03 (made 2019), all identified as SFP-10GBase-CX1 on the…
A UCG-Fiber used a UACC-CM-RJ45-MG 10GBASE-T module (port 6, later port 7) to reach a Zyxel XS1930. Whenever the copper cable was disconnected for more than about 40 s or the Zyxel rebooted, the link never came back until the module was pulled for a minute or the gateway rebooted; forcing 10G or 1G…
After moving a Bell fibre connection from an ER-X to an ER-4 with the ISP's Alcatel-Lucent/Nokia GPON SFP (3FE46541AA / G-010S-P) plugged directly into eth3, the WAN dropped every 3 to 60 minutes; syslog had hundreds of kernel: Failed to read SFP EEPROM1 at byte 0 val -6!! entries and SFP module…
Newly delivered EdgeSwitch ES-24 units linked to each other over gigabit SX SFPs, but the same modules (HP J4858B, J4858A, Avago AFBR-57M5APZ, Avaya AFBR5715PZ, Cisco) would not link ES-24 to HP ProCurve (four models) or Netgear (two models): the ES-24 showed a link light, the other side did not…
An embedded device with a 10GbE SFP transceiver kept logging power warnings above 800 mW and occasional errors when fed by an NVIDIA/Mellanox MMA2P00-AS 10/25G transceiver over a 2 m OM3 LC patch. The poster assumed transmit power is negotiated between the two ends and asked whether a failed…
I do industrial installs, mostly Hirschmann switches in cabinets nobody wants to open twice. On the last couple of projects the optics were the line item that hurt: the switches expect Hirschmann-coded modules, and the original M-SFP parts cost several times an equivalent generic module, with lead…
A dual-port ConnectX-5 (MT27800, firmware 16.35.1012, MLNXOFED 5.8 on BC-Linux 8.2) connected to a switch with a DAC would not recover after the cable had been connected and disconnected about fifteen times: the port stayed in State: Polling with Physical state ETHANFSMABILITYDETECT, and mlxlink…
Field turn-up work on SDH circuits, and the tester has been fighting me on the optical side lately. Same kit that has been fine for years, so before I book a service call I want a sanity check on the order I should be working through. Viavi T-BERD/MTS-5800 with the SFP port populated, generic…
Small vSphere cluster, two 10G uplinks per host into a pair of top-of-rack switches. After the ToR was rebooted for a firmware update, part of the VMs on one host went silent and vMotion failed on both uplinks - yet ESXi never marked anything down and the adapter LEDs stayed lit the whole time…