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--- nas:build_a_linux_nas:create_a_filesystem [2021/09/25 19:49] – peter
+++ nas:build_a_linux_nas:create_a_filesystem [2021/09/25 20:14] (current) – peter
@@ Line 8: / Line 8: @@
 **NOTE:**  **/dev/md0** can be used now just as any other block device.
-  * The script at http://busybox.net/~aldot/mkfs_stride.html can be used to calculate the best settings for the filesystem: <code bash>
+The following formulae can be used to calculate the best settings for the filesystem:
+  * **blocksize (in KiB)** = 4
+  * **chunksize (in KiB)** = 512
+  * **stride** = chunksize / blocksize = 512 / 4 = 128;
+    * IMPORTANT:  stride has to be multiple of 2!
+  * **effective_disks** =
+    * If Raid6 = number of disks - 2.
+    * if Raid5 = number of disks - 1.
+    * if Raid1 = number of disks / 2.
+    * if Raid10 = number of disks / 2.
+  * **stripe-width** = stride * effective_disks;
+<code bash>
 mkfs.ext4 -b 4096 -E stride=128,stripe-width=256 /dev/md0
 </code>
-    * where
-      * RAID chunk size (in KiB):  512
+For further details, get a recent e2fsprogs and look for stride, stripe etc. in the man page.
-      * Number of filesystem blocks (in KiB): 4
 </WRAP>