diff --git a/cmd/bd/daemon_health_solaris.go b/cmd/bd/daemon_health_solaris.go
new file mode 100644
index 00000000..fba21385
--- /dev/null
+++ b/cmd/bd/daemon_health_solaris.go
@@ -0,0 +1,23 @@
+//go:build illumos || solaris
+
+package main
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+// checkDiskSpace returns the available disk space in MB for the given path.
+// Returns (availableMB, true) on success, (0, false) on failure.
+func checkDiskSpace(path string) (uint64, bool) {
+	var stat unix.Statvfs_t
+	if err := unix.Statvfs(path, &stat); err != nil {
+		return 0, false
+	}
+
+	// Calculate available space in bytes, then convert to MB.
+	// On Solaris/illumos, Frsize is the fragment size (fundamental block size).
+	availableBytes := stat.Bavail * stat.Frsize
+	availableMB := availableBytes / (1024 * 1024)
+
+	return availableMB, true
+}
diff --git a/cmd/bd/daemon_health_unix.go b/cmd/bd/daemon_health_unix.go
index 4ba292d0..52e18f24 100644
--- a/cmd/bd/daemon_health_unix.go
+++ b/cmd/bd/daemon_health_unix.go
@@ -1,4 +1,4 @@
-//go:build !windows && !wasm && !freebsd
+//go:build !windows && !wasm && !freebsd && !illumos && !solaris
 
 package main