{"id":14869,"date":"2020-10-14T19:44:37","date_gmt":"2020-10-14T17:44:37","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/sql-server-alwayson-node-and-add-all-eligible-storage-to-the-cluster\/"},"modified":"2025-10-01T11:47:20","modified_gmt":"2025-10-01T09:47:20","slug":"sql-server-alwayson-node-and-add-all-eligible-storage-to-the-cluster","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/sql-server-alwayson-node-and-add-all-eligible-storage-to-the-cluster\/","title":{"rendered":"SQL Server AlwaysOn node “Add all eligible storage to the cluster”"},"content":{"rendered":"

I made a mistake recently when adding a new node to an existing Windows Failover Cluster supporting AlwaysOn SQL Server instances.<\/p>\n

When adding a new node using the GUI there’s this option checked by default named “Add all eligible storage to the cluster”.<\/p>\n

\"\"<\/p>\n

Before performing the operation the disks on the 2 nodes of my cluster were used by the SQL Server instances.
\nBecause I’m using the AlwaysOn features the disks are local on each node. They are not clustered.<\/p>\n

This option doesn’t seem to perform any check about the disks state. It will take offline all the disks on all the cluster nodes and try to add them to the cluster.<\/p>\n

So after clicking “Finish” on the Wizard, all the disks on my 2 existing nodes where OFFLINE.
\nAll my AlwaysOn instances were down.<\/p>\n

\"\"<\/a><\/p>\n

If you are in the same situation you will find below the steps I went through to fix fix my AlwaysOn instances.<\/p>\n

First, I removed all the disks from the cluster. As you can see all the disks are visible as “Cluster Shared Volume”. In my case, they were Offline, not Online as shown in this screenshot.<\/p>\n

\"\"<\/a><\/p>\n

I did this first step manually in the Failover Cluster Manager interface but it could be done faster using the Remove-ClusterSharedVolume<\/a> command.<\/p>\n

Secondly, I put all the disks back Online. I had dozens of disks. Instead of doing it manually here is the Powershell script that can save a lot of time.<\/p>\n

With Get-Disk<\/a> we can list the Offline disks.<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n
8<\/div>\n
9<\/div>\n<\/td>\n
\n
\n
PS C:\\> <\/code>Get-Disk<\/code> | <\/code>Where-Object<\/code> IsOffline <\/code>-Eq<\/code> $True<\/code><\/div>\n
<\/div>\n
Number Friendly Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 OperationalStatus<\/code><\/div>\n
------ -------------\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 -----------------<\/code><\/div>\n
1\u00a0\u00a0\u00a0\u00a0\u00a0 VMware Virtual disk SCSI Disk Device\u00a0\u00a0\u00a0\u00a0 Offline<\/code><\/div>\n
2\u00a0\u00a0\u00a0\u00a0\u00a0 VMware Virtual disk SCSI Disk Device\u00a0\u00a0\u00a0\u00a0 Offline<\/code><\/div>\n
3\u00a0\u00a0\u00a0\u00a0\u00a0 VMware Virtual disk SCSI Disk Device\u00a0\u00a0\u00a0\u00a0 Offline<\/code><\/div>\n
4\u00a0\u00a0\u00a0\u00a0\u00a0 VMware Virtual disk SCSI Disk Device\u00a0\u00a0\u00a0\u00a0 Offline<\/code><\/div>\n
5\u00a0\u00a0\u00a0\u00a0\u00a0 VMware Virtual disk SCSI Disk Device\u00a0\u00a0\u00a0\u00a0 Offline<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Piping this into Set-Disk<\/a> will do the Job for all disks in one command.<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n<\/td>\n
\n
\n
PS C:\\> <\/code>Get-Disk<\/code> | <\/code>Where-Object<\/code> IsOffline <\/code>-Eq<\/code> $True<\/code> | <\/code>Set-Disk<\/code> -IsOffline<\/code> $False<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Now the disks are online and you should be able to start your SQL Server instances.<\/p>\n

My instances did not start at all even with the disks back online.
\nLooking at the error log I could see an issue with the master database.<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n<\/td>\n
\n
\n
The operating system returned error 21(The device is not ready.) to SQL Server <\/code><\/div>\n
during a read at offset 0x0000000004a000 in file 'C:\\mountpoints\\**\\master.mdf'. <\/code><\/div>\n
Additional messages in the SQL Server error log and system event log may provide more detail. <\/code><\/div>\n
This is a severe system-level error condition that threatens database integrity and must be corrected immediately. <\/code><\/div>\n
Complete a full database consistency check (DBCC CHECKDB).<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Looking at the folder permissions everything seemed to be good. The issue was at the disk level.<\/p>\n

When turned back online the disks were in a Read-only state. This setting was probably set when the cluster tried to add the disks to its available storage.<\/p>\n

Again, here is the Powershell script that will remove the Read-only flag on all disks instead of doing it one by one with Diskpart.<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n
8<\/div>\n
9<\/div>\n<\/td>\n
\n
\n
PS C:\\> <\/code>Get-Disk<\/code> | <\/code>Where-Object<\/code> IsReadonly <\/code>-Eq<\/code> $True<\/code><\/div>\n
<\/div>\n
Number Friendly Name\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 OperationalStatus<\/code><\/div>\n
------ -------------\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 -----------------<\/code><\/div>\n
1\u00a0\u00a0\u00a0\u00a0\u00a0 VMware Virtual disk SCSI Disk Device\u00a0\u00a0\u00a0\u00a0 Online<\/code><\/div>\n
2\u00a0\u00a0\u00a0\u00a0\u00a0 VMware Virtual disk SCSI Disk Device\u00a0\u00a0\u00a0\u00a0 Online<\/code><\/div>\n
3\u00a0\u00a0\u00a0\u00a0\u00a0 VMware Virtual disk SCSI Disk Device\u00a0\u00a0\u00a0\u00a0 Online<\/code><\/div>\n
<\/div>\n
PS C:\\> <\/code>Get-Disk<\/code> | <\/code>Where-Object<\/code> IsReadonly <\/code>-Eq<\/code> $True<\/code> | <\/code>Set-Disk<\/code> -IsReadonly<\/code> $False<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

After this last command, I managed to start again all the SQL Server instances on all nodes.<\/p>\n

I would recommend to always uncheck this option when adding a node to a Cluster whether it hosts FCI or AlwaysOn instances. I don’t know why Microsoft still have this option checked by default when there is no shared storage.
\nIf you just did the mistake I hope these PowerShell lines will save you some time fixing your servers.<\/p>\n

Written by Steven Naudet<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

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