Throttle disk write to prevent etcd puking during upgrade

clitools/pkg/node/uboot/ab.go

@@ -32,7 +32,7 @@ func ConfigureABBoot(ctx context.Context, nctx *node.NodeContext) error {
 				return fmt.Errorf("read boot state: %w", err)
 			}
 
-			bootPart := state["BOOT_PART"]
+			bootPart = state["BOOT_PART"]
 			if bootPart == "" {
 				return fmt.Errorf("BOOT_PART missing")
 			}

clitools/pkg/node/uboot/types.go

@@ -70,6 +70,6 @@ fi;
 setenv bootdev 0:${rootpart};
 setenv rootdev ${boot_source}:${rootpart};
 
-setenv bootargs "${bootargs_console} root=${rootdev} bootpart=${boot_part} rw rootwait rootfstype=ext4";
+setenv bootargs "${bootargs_console} root=${rootdev} bootpart=${boot_part} rw rootwait rootfstype=ext4 delayacct";
 ext4load ${boot_iface} ${bootdev} ${kernel_addr_r} /boot/kernel.itb && bootm ${kernel_addr_r};
 `