When attempting to bring a cluster disk online after a successful failover, where you're attempting to make the original source site primary again, you receive an error in Failover Cluster Manager. For example:
How to bring a REFS volume online again if it get’s offline and alert about it.
To recover the data or access the drive, you need to unlock the log drive first, and then open Diskmgmt.msc to locate the data drive. Mark the data drive offline and online again. Locate the BitLocker icon on the drive and unlock the drive.
After presenting a storage disk on a Windows machine, it is very easy to initialize raw disks and bring them online using PowerShell. With just a few PowerShell cmdlets, you can also create partitions and volumes so they're accessible through the file system.Subscribe to 4sysops newsletter!Get-Disk Where-Object PartitionStyle -eq 'RAW' Initialize-Disk -PartitionStyle MBR -PassThru New-Partition -AssignDriveLetter -UseMaximumSize Format-Volume -FileSystem NTFS -Confirm:$falseManaging storage with PowerShell
Windows Server 2012 introduced an awesome feature called Check Disk spot fix. This feature allows you to do an online scan on a volume and logs any issues to a file called $corrupt. You can then issue a spot fix repair that will reference that file and repair the logged issues without needing to scan the entire volume again. This considerably speeds up the repair process taking only seconds to take a volume offline and repair, preventing the need to hassle with long outages.
Salvaging data - If a volume becomes corrupted and an alternate copy of the corrupted data doesn't exist, ReFS removes the corrupt data from the namespace. ReFS keeps the volume online while it handles most non-correctable corruptions, but there are rare cases that require ReFS to take the volume offline.
This can easily be reproduced in a test environment by putting a database on a disk, disabling the disk, running a select query (to get the error), bringing the disk back online and noticing that the select still fails with the same error. The database will need to be remounted in order to work again and not get OS Error 21.
You can take an online tablespace offline so that it is temporarily unavailable for general use. The rest of the database remains open and available for users to access data. Conversely, you can bring an offline tablespace online to make the schema objects within the tablespace available to database users. The database must be open to alter the availability of a tablespace.
If no files are offline, but you use the temporary clause, media recovery is not required to bring the tablespace back online. However, if one or more files of the tablespace are offline because of write errors, and you take the tablespace offline temporarily, the tablespace requires recovery before you can bring it back online.
If a tablespace to be brought online was not taken offline "cleanly" (that is, using the NORMAL clause of the ALTER TABLESPACE OFFLINE statement), you must first perform media recovery on the tablespace before bringing it online. Otherwise, the database returns an error and the tablespace remains offline.
It is estimated that a novel COVID-19 vaccine will need to be accepted by at least 55% of the population to provide herd immunity, with estimates reaching as high as 85% depending on country and infection rate15,16. Reaching these required vaccination levels should not be assumed given well-documented evidence of vaccine hesitancy across the world17, which is often fuelled by online and offline misinformation surrounding the importance, safety or effectiveness of vaccines18,19,20. There has been widely circulating false information about the pandemic on social media platforms, such as that 5G mobile networks are linked with the virus, that vaccine trial participants have died after taking a candidate COVID-19 vaccine, and that the pandemic is a conspiracy or a bioweapon21,22,23. Such information can build on pre-existing fears, seeding doubt and cynicism over new vaccines, and threatens to limit public uptake of COVID-19 vaccines. 2ff7e9595c
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