@bogdantomasciuc Glad to hear. I was hoping it was just something missed or miss typed. If you can replicate the issue let me know. Its possible i might have missed that little nuance or something.

I looked and couldn't find a replacement procedure in the XOSTOR docs, only the neighbouring parts ("How to add storage on a new host?" and how to read linstor resource list) on https://docs.xcp-ng.org/xostor. A lot probably depends on how the four drives were pooled. @ronan-a advised a while back to join a host's disks into one linear volume rather than RAID them (https://xcp-ng.org/forum/post/62926). If yours are set up like that, I think one dead drive takes out that host's whole local pool while the copies on the other hosts keep the VDIs readable, but I'm not sure. Could you say whether the SR is thin or thick, whether the host is still up, and paste linstor resource list from it? That's also what @Team-Storage will want to see, I guess.

I finally got access to a machine with Intel Arc machine. There are issues around hvm-pirq, hence hvm-pirq=0 is required (see https://docs.xcp-ng.org/troubleshooting/common-problems/#pci-passthrough-error-unsupported-msi-delivery-mode-7). For some reason, Fedora Workstation has a issue with this GPU (a Fedora bug I guess), but CachyOS (desktop iso) works fine. Ran a clpeak bench, and performance looks normal for this class of GPU. Host-device transfer is a bit slower than "theorical", but definetely not PCIe 1x1 and more PCIe 3x8-ish (matching reality as it's plugged as PCIe 3.0). in-VM inxi -CGM Machine: Type: Xen System: Xen product: HVM domU v: 4.17 serial: 2c66cb09-57db-340c-ad8e-f505eb25ca3e Mobo: N/A model: N/A serial: N/A Firmware: UEFI vendor: Xen v: 4.17 date: 10/06/2026 CPU: Info: 6x 1-core model: Intel Xeon Silver 4112 bits: 64 type: SMP cache: L2: 6x 1024 KiB (6 MiB) Speed (MHz): avg: 2594 min/max: N/A cores: 1: 2594 2: 2594 3: 2594 4: 2594 5: 2594 6: 2594 Graphics: Device-1: driver: bochs-drm v: N/A Device-2: Intel Battlemage G21 [Arc Pro B50] driver: xe v: kernel Display: unspecified server: Xwayland v: 24.1.13 driver: gpu: bochs-drm tty: 212x48 API: EGL v: 1.5 drivers: iris,swrast platforms: gbm,surfaceless,device API: OpenGL v: 4.6 vendor: mesa v: 26.1.6-arch3.1 note: console (EGL sourced) renderer: Mesa Intel Arc Pro B50 Graphics (BMG G21), llvmpipe (LLVM 22.1.8 256 bits) API: Vulkan v: 1.4.357 drivers: intel surfaces: N/A Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo de: kscreen-console,kscreen-doctor gpu: gputop, intel_gpu_top, lsgpu, nvidia-smi wl: wayland-info x11: xdpyinfo, xprop, xrandr Raw numbers Backend: Vulkan Device 0: Intel(R) Arc(tm) Pro B50 Graphics (BMG G21) Driver version : 26.2.4 API version : 1.4.354 VRAM : 16048 MB Single-precision compute float : 9.47 TFLOPS float2 : 9.48 TFLOPS float4 : 9.52 TFLOPS Half-precision compute fp16xfp16+fp16 half : 18.3 TFLOPS half2 : 18.8 TFLOPS half4 : 19.1 TFLOPS Double-precision compute double : 650 GFLOPS double2 : 647 GFLOPS double4 : 640 GFLOPS Mixed-precision compute fp16xfp16+fp32 mp : 9.31 TFLOPS mp2 : 9.32 TFLOPS mp4 : 9.42 TFLOPS BF16 compute bf16xbf16+fp32 bf16 : 9.17 TFLOPS bf16_2 : 9.30 TFLOPS bf16_4 : 9.28 TFLOPS Integer compute int32 int : 1.81 TOPS int2 : 1.88 TOPS int4 : 1.82 TOPS INT8 dot-product compute int8_dp : 28.0 TOPS int8_dp2 : 26.3 TOPS int8_dp4 : 27.1 TOPS Cooperative matrix fp16 : 67.3 TFLOPS fp16 f16acc : 68.9 TFLOPS bf16 : 68.9 TFLOPS int8 : 141 TOPS Global memory bandwidth float : 196 GB/s float2 : 206 GB/s float4 : 212 GB/s Local memory bandwidth float : 2.55 TB/s float2 : 3.65 TB/s float4 : 4.23 TB/s Image memory bandwidth float4 : 213 GB/s Transfer bandwidth h2d : 4.81 GB/s d2h : 5.48 GB/s Kernel launch latency dispatch : 48.7 us roundtrip : 113 us Real performance is much higher than the "displayed" Speed 2.5GT/s, Width x1.