Just to let everbody know, incase you run into the same issue: The DELL ME5's 25gbpe iSCSI interfaces are only capable of 12gbps bandwidth max.I showed the issue to a Dell technician who then proceeded to test the issue in the Dell labs and found that the speed is limited at 12gbps. Apparently their hardware team has confirmed this. The Support Manager told me that this fact will be added to the ME5's documentation. I don't know if Dell will (or can) fix the issue in an upcoming firmware for the ME5.
I have an issue with an ME5024, equipped with 2 iSCSI 25gbe controllers. -It is equipped with 12 * 3.8TB SSD in an ADEPT 8+2 Volume on Controller A-It is direct-attached to 3 ESXI Servers via SFP28 25gbe cables.-Each ESXi (DELL RE750) has one connection to Controller A and another to Controller B (with Round-Robin iSCSI Multipathing) through Intel XXV710 2*25gbe SFP28 card (Dell branded) with software iSCSI. The network cards are in Slot 1/Riser 1-Cause the ME5024 is ALUA, the active IO path is always the single link to Controller A (unless the link fails, in which case it will use Controller B over the other link)The issue I see is: -Using 1 VM on ESXI_A: I get 1200MB/s of read / 1000MB/s write throughput-Using 1 VM on ESXI_A and 1 VM on ESXI_B: I get 2400MB/s of (total) read throughput (and 2000MB/s write) -> Array performance is not the cause for my issue-Using 2 VMs on one ESXI: I get 1200MB/s of (total) read throughput-Using 3 VMs on one ESXI: I get 1200MB/s of (total) read throughput Is 1200MB/s read / 1000MB/s write the limit for a single 25gbe iSCSI port on the ME5024? I was expecting something more around 25gbe speeds (2GB/s +) I've tried all sorts of things already, and I'm out of ideas: -Disabled delayed ACK on the iSCSI Software Adapter-Updated the XXV710 with newest Dell Firmware-Updated the i40en Driver on the ESXI with newest Dell Driver for VMWare-ESXI is v7 U2-Tried multiple SCSI Controllers on guest OS-Configured each controller port with it's own Subnet for iSCSI Thanks!
PowerVault ME5024 iSCSI 25gbe interface speed?