Differences

This shows you the differences between two versions of the page.

--- raid:mdadm:check_the_raid_status [2021/09/13 23:07] – peter
+++ raid:mdadm:check_the_raid_status [2021/09/14 08:41] (current) – peter
@@ Line 9: / Line 9: @@
 <code bash>
 Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath]
-md4 : active raid1 sdi3[0]
+md0 : active raid6 sdf3[0] sdd3[7] sdg3[6] sdh3[5] sdc3[4] sdb3[2] sda3[3] sde3[1]
-      23432007232 blocks super 1.0 [1/1] [U]
-md3 : active raid1 sdk3[0]
-      23432007232 blocks super 1.0 [1/1] [U]
-md1 : active raid6 sdf3[0] sdd3[7] sdg3[6] sdh3[5] sdc3[4] sdb3[2] sda3[3] sde3[1]
       46824429696 blocks super 1.0 level 6, 64k chunk, algorithm 2 [8/8] [UUUUUUUU]
       bitmap: 21/59 pages [84KB], 65536KB chunk
-md322 : active raid1 sdc5[7](S) sdd5[6](S) sda5[5](S) sdb5[4](S) sdg5[3](S) sdh5[2](S) sde5[1] sdf5[0]
-      7235136 blocks super 1.0 [2/2] [UU]
-      bitmap: 0/1 pages [0KB], 65536KB chunk
-md256 : active raid1 sdc2[7](S) sdd2[6](S) sda2[5](S) sdb2[4](S) sdg2[3](S) sdh2[2](S) sde2[1] sdf2[0]
-blocks super 1.0 [2/2] [UU]
-      bitmap: 0/1 pages [0KB], 65536KB chunk
-md13 : active raid1 sdd4[38] sdf4[0] sde4[32] sda4[34] sdb4[33] sdc4[35] sdh4[36] sdg4[37]
-blocks super 1.0 [33/8] [UUUUUUUU_________________________]
-      bitmap: 1/1 pages [4KB], 65536KB chunk
-md9 : active raid1 sdd1[38] sdf1[0] sde1[32] sda1[34] sdb1[33] sdc1[35] sdh1[36] sdg1[37]
-blocks super 1.0 [32/8] [UUUUUUUU________________________]
-      bitmap: 1/1 pages [4KB], 65536KB chunk
-unused devices: <none>
 </code>
 <WRAP info>
-**NOTE:**  The values returned are:
+**NOTE:**
+  * **Personalities**:  What RAID levels the kernel currently supports.
+    * This can be changed by either changing the raid modules or recompiling the kernel.
+    * Possible personalities include: [raid0] [raid1] [raid4] [raid5] [raid6] [linear] [multipath] [faulty]
+      * **[faulty]** is a diagnostic personality; it does not mean there is a problem with the array.
-  * **F**:  The drive has failed.
+  * **md0**:  The device is /dev/md0.
-  * **U**:  The drive is used and working fine.
+  * **active**:  The RAID is active and started.
-  * **_**:  The drive is unused.
+    * An inactive array is usually faulty. Stopped arrays are not visible here.
+  * **raid6**:  The type of RAID array and the component devices are:
+    * **sdf3[0]** is device 0.
+    * **sdd3[7]** is device 7.
+    * **sdg3[6]** is device 6.
+    * **sdh3[5]** is device 5.
+    * **sdc3[4]** is device 4.
+    * **sdb3[2]** is device 2.
+    * **sda3[3]** is device 3.
+    * **sde3[1]** is device 1.
+      * The order in which the devices appear in this line means nothing.
+  * **46824429696 blocks**:  The usable size of the array in blocks.
+  * **super 1.0**:  The array uses a 1.0 [[https://raid.wiki.kernel.org/index.php/RAID_superblock_formats|superblock]].
+  * **level 6**:  Confirms this is a level 6 array.
+  * **64k chunk**:  Has a chunk size of 64k.
+    * This is the size for 'chunks' and is only relevant to raid levels that involve striping (1,4,5,6,10).
+    * The address space of the array is conceptually divided into chunks and consecutive chunks are striped onto neighboring devices.
+  * **algorithm 2**:  Uses algorithm 2.
+  * **[8/8]**:  The first number is the number of a complete raid devices as defined.  The second number is how many devices are in use.
+  * **[UUUUUUUU]**:  The status of each device.
+    * **F**:  The drive has failed.
+    * **U**:  The drive is used and working fine.
+    * **_**:  The drive is down.
 </WRAP>