binar,
in regards to available/usable space in your example of 24TB hdd setup.... without going into the nittygritty because it depends on a whole lota factors like, size, drive type, drive brand, drive specs, controller's spec, and so on..... a good rule of thumb and ball park.... use the 75~70% gauge being on the conservative side. Without knowing the actual details of the hardware/firmware of the setup .... for a 24TB at 1TB size each... this would come out to be 21.998TB of available space according to my resource.
now as for "hot swop".... lol is this Chinglish????
There are two terms that you need to be aware, they are Hot Swap and Hot Spare....
Hot Swap - means that the controller can handle an event where a drive bites the dust, you can pull the drive and then turn around and insert a new drive all the while with the system and OS fully up and running. So lets say in your setup... a drive pewukes... you get a notification that a drive has failed... you have a spare drive lying around... you go up to your setup and pull the bad drive, insert the replacement drive, and the controller should launch the rebuild process all the while as you return to your Sally does Dallas movie and burning movie iso...
Hot Spare - means that you have a spare drive as part of the configuration set and all it is there for is to sit there waiting for one of the other drive to fail. It is in standby mode. When one of the other drive actually fail, the controller will bring the "Hot Spare" into the group and will start the rebuild process to this drive to make the set whole again. When you go to replace the bad drive, depending on the controller or configuration, the new drive could become the new "Hot Spare" or get copy paste from the original Hot Spare, in which case the original Hot Spare becomes from being part of the group back to being the Hot Spare again.
Now depending on the controller card when it comes to Hot Swap or Hot Spare, it may have one or the other...... or both.... If you dont have Hot Swap, then you will have to shutdown the raid set, i.e. make it unavailable to the OS or shutdown the system in order to replace the bad drive. If you pull the bad drive and even inserting a new drive from the drive set and you DONT have Hot Swap..... you will have the possibility of causing issue with the system like hang, system reset, crash, and so forth... The controller has to have hardware components to be able to handle the bus reset as the drive is pulled and reinserted so as this will not cause electrical issues on the system.
hopefully you are not confused by my explainations
in regards to available/usable space in your example of 24TB hdd setup.... without going into the nittygritty because it depends on a whole lota factors like, size, drive type, drive brand, drive specs, controller's spec, and so on..... a good rule of thumb and ball park.... use the 75~70% gauge being on the conservative side. Without knowing the actual details of the hardware/firmware of the setup .... for a 24TB at 1TB size each... this would come out to be 21.998TB of available space according to my resource.
now as for "hot swop".... lol is this Chinglish????
There are two terms that you need to be aware, they are Hot Swap and Hot Spare....
Hot Swap - means that the controller can handle an event where a drive bites the dust, you can pull the drive and then turn around and insert a new drive all the while with the system and OS fully up and running. So lets say in your setup... a drive pewukes... you get a notification that a drive has failed... you have a spare drive lying around... you go up to your setup and pull the bad drive, insert the replacement drive, and the controller should launch the rebuild process all the while as you return to your Sally does Dallas movie and burning movie iso...
Hot Spare - means that you have a spare drive as part of the configuration set and all it is there for is to sit there waiting for one of the other drive to fail. It is in standby mode. When one of the other drive actually fail, the controller will bring the "Hot Spare" into the group and will start the rebuild process to this drive to make the set whole again. When you go to replace the bad drive, depending on the controller or configuration, the new drive could become the new "Hot Spare" or get copy paste from the original Hot Spare, in which case the original Hot Spare becomes from being part of the group back to being the Hot Spare again.
Now depending on the controller card when it comes to Hot Swap or Hot Spare, it may have one or the other...... or both.... If you dont have Hot Swap, then you will have to shutdown the raid set, i.e. make it unavailable to the OS or shutdown the system in order to replace the bad drive. If you pull the bad drive and even inserting a new drive from the drive set and you DONT have Hot Swap..... you will have the possibility of causing issue with the system like hang, system reset, crash, and so forth... The controller has to have hardware components to be able to handle the bus reset as the drive is pulled and reinserted so as this will not cause electrical issues on the system.
hopefully you are not confused by my explainations