spdk: add troubleshooting page

Signed-off-by: Derek Su <derek.su@suse.com>

content/docs/1.5.0/spdk/troubleshooting.md

@@ -0,0 +1,34 @@
+---
+title: Troubleshooting
+weight: 6
+---
+
+- [Disk](#disk)
+  - ["Invalid argument" Error in Disk Status After Adding a Block-Type Disk](#invalid-argument-error-in-disk-status-after-adding-a-block-type-disk)
+
+---
+
+## Disk
+
+### "Invalid argument" Error in Disk Status After Adding a Block-Type Disk
+
+After adding a block-type disk, the disk status displays error messages:
+```
+Disk disk-1(/dev/nvme1n1) on node dereksu-ubuntu-pool1-bf77ed93-2d2p9 is not ready: 
+failed to generate disk config: error: rpc error: code = Internal desc = rpc error: code = Internal 
+desc = failed to add block device: failed to create AIO bdev: error sending message, id 10441, 
+method bdev_aio_create, params {disk-1 /host/dev/nvme1n1 4096}: {"code": -22,"message": "Invalid argument"}
+```
+
+Next, inspect the log message of the instance-manager pod on the same node. If the log reveals the following:
+```
+[2023-06-29 08:51:53.762597] bdev_aio.c: 762:create_aio_bdev: *WARNING*: Specified block size 4096 does not match auto-detected block size 512
+[2023-06-29 08:51:53.762640] bdev_aio.c: 788:create_aio_bdev: *ERROR*: Disk size 100000000000 is not a multiple of block size 4096
+```
+These messages indicate that the size of your disk is not a multiple of the block size 4096 and is not supported by Longhorn system.
+
+To resolve this issue, you can follow the steps
+1. Remove the newly added block-type disk from the node.
+2. Partition the block-type disk using the `fdisk` utility and ensure that the partition size is a multiple of the block size 4096.
+3. Add the partitioned disk to the Longhorn node.
+