diff --git a/files/Aboot/boot0.j2 b/files/Aboot/boot0.j2
index 0905faad4c..6460ddbbec 100644
--- a/files/Aboot/boot0.j2
+++ b/files/Aboot/boot0.j2
@@ -47,7 +47,6 @@ extract_image() {
             rm -rf "$target_path/$f"
         fi
     done
-        
 
     ## Unzip the image
     unzip -oq "$swipath" -x boot0 -d "$target_path"
@@ -102,6 +101,8 @@ platform_specific() {
     if [ "$platform" = "raven" ]; then
         aboot_machine=arista_7050_qx32
         echo "modprobe.blacklist=radeon" >>/tmp/append
+        # set varlog size to 100MB
+        echo "varlog_size=100" >>/tmp/append
     fi
     if [ "$platform" = "crow" ]; then
         aboot_machine=arista_7050_qx32s
diff --git a/files/initramfs-tools/arista-convertfs.j2 b/files/initramfs-tools/arista-convertfs.j2
index 8847bc69bd..6e3f2d633b 100644
--- a/files/initramfs-tools/arista-convertfs.j2
+++ b/files/initramfs-tools/arista-convertfs.j2
@@ -82,6 +82,28 @@ run_cmd() {
     fi
 }
 
+create_varlog_file() {
+    local err_msg="Error: create var-log ext4 file"
+    local cmd="[ -n $varlog_size ] && mkdir -p $root_mnt/disk-img && dd if=/dev/zero of=$root_mnt/disk-img/var-log.ext4 count=$((2048*$varlog_size)) && mke2fs -t ext4 -q -F $root_mnt/disk-img/var-log.ext4"
+    run_cmd "$cmd" "$err_msg"
+}
+
+mount_and_create_varlog_file() {
+    [ -z "$varlog_size" ] && exit 0
+    mkdir -p "$root_mnt"
+    mount -t ext4 "$root_dev" "$root_mnt"
+    # exit when the var_log.ext4 exists and the size matches
+    if [ -e "$root_mnt/disk-img/var-log.ext4" ]; then
+        cur_varlog_size=$(ls -l $root_mnt/disk-img/var-log.ext4 | awk '{print $5}')
+        if [ $cur_varlog_size == $((1024*1024*$varlog_size)) ]; then
+            exit 0
+        fi
+    fi
+    create_varlog_file
+    umount "$root_mnt"
+    exit 0
+}
+
 # Extract kernel parameters
 set -- $(cat /proc/cmdline)
 for x in "$@"; do
@@ -91,6 +113,9 @@ for x in "$@"; do
             ;;
         Aboot=*)
             aboot_flag="${x#Aboot=}"
+            ;;
+        varlog_size=*)
+            varlog_size="${x#varlog_size=}"
     esac
 done
 root_dev="$ROOT"
@@ -105,8 +130,9 @@ if ! wait_for_root_dev; then
     echo "Error: timeout in waiting for $root_dev"
     exit 1
 fi
-blkid | grep "$root_dev.*vfat" -q || exit 0
 
+# mount, create varlog file and exit when the root is ext4
+blkid | grep "$root_dev.*vfat" -q || mount_and_create_varlog_file
 
 # Get flash dev name
 if [ -z "$block_flash" ]; then
@@ -171,3 +197,5 @@ run_cmd "$cmd" "$err_msg"
 err_msg="Error: copying files form $tmp_mnt to $root_mnt failed"
 cmd="cp -a $tmp_mnt/. $root_mnt/"
 run_cmd "$cmd" "$err_msg"
+
+create_varlog_file