Simple spaces require at least two drives to be useful. Mirror spaces are designed for increased performance and protect your files from drive failure by keeping multiple copies. Two-way mirror spaces make two copies of your files and can tolerate one drive failure, while three-way mirror spaces can tolerate two drive failures. Mirror spaces are good for storing a broad range of data, from a general-purpose file share to a VHD library.
When a mirror space is formatted with the Resilient File System ReFS , Windows will automatically maintain your data integrity, which makes your files even more resilient to drive failure.
Two-way mirror spaces require at least two drives, and three-way mirror spaces require at least five. Parity spaces are designed for storage efficiency and protect your files from drive failure by keeping multiple copies. Parity spaces are best for archival data and streaming media, like music and videos. This storage layout requires at least three drives to protect you from a single drive failure and at least seven drives to protect you from two drive failures.
After you upgrade to Windows, we recommend that you upgrade your existing pools. With an upgraded pool, you can optimize drive usage and remove drives from pools without affecting the pool's protection from drive failure.
Note: Upgraded pools aren't compatible with previous versions of Windows. When you add new drives to an existing pool, it's a good idea to optimize drive usage. This will move some of your data to the newly added drive to make the best use of the pool's capacity. It'll happen by default when you add a new drive to an upgraded pool in Windows you'll see a check box for Optimize to spread existing data across all drives selected when you add the drive.
However, if you cleared that check box or added drives before upgrading a pool, you'll need to manually optimize drive usage. To do so, type Storage Spaces in the search box on the taskbar, select Storage Spaces from the list of search results, and then select Optimize drive usage. If you created a pool in Windows or upgraded an existing pool, you'll be able to remove a drive from it.
The data stored on that drive will be moved to other drives in the pool, and you'll be free to use the drive for something else. Leave your PC plugged in until the drive is ready to be removed. This could take several hours, depending on how much data you have stored there. Optional To speed up drive preparation, prevent your PC from going to sleep.
This avoids disk read and increases performance. The part of the SGA called the Buffer Cache holds copies of the data blocks that have been read from the data files.
Those data blocks that are not frequently used will be replaced over time with other database blocks. Therefore you should always put table into cache in Oracle for faster access. When configuring a new database instance, it is impossible to know the correct size for the buffer cache.
Though expanding a RAID pool on Synology is generally low risk, you should still backup your critical files to an external hard drive before doing anything with your pool. All modern versions of DSM allow for disks to be inserted in any order to create a volume.
However just because you can does not mean you should. I would recommend having all of your drives in a single volume next to each other as it will make locating disks easier later on. If your Synology supports hot swapping you can simply insert the drive without powering off.
Open up Storage Pool from the menu on the left hand side, and you should see an Action drop down menu. From this menu you will have the option to either add a drive, which will expand the Pool, or to change Raid type. Select Add drive and your pool will begin. You are now done! The screen should look something like this:. The ability to expand the storage pool on your Synology NAS greatly improves your ability to future proof. Another great feature of adding an additional drive is the performance gain that you get, which becomes especially apparent with sequential reads and writes.
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