Instruction: Answer the given question using the supporting document.

Input:
Question: Can I change the RAID type after installing additional disks? and is it possible to swap from SHR to RAID 5 without re-installation of DSM OS
Document: The DS1813+ internally supports up to eight hard drives in one of several software RAID levels (SHR, RAID 1, RAID 5, RAID 6, and RAID 10). Drive installs are performed without using a screwdriver, with the drive carriages held in place by a flimsy lock and key mechanism.The DS1813+ ships without an installed operating system, so the first task after powering on the DS1813+ with the hard drives installed involves installing the latest DSM operating system.
I love the changes from the 1812 to this one. Disk installation for 3.5&#34; disks was incredibly easy. They now have &#34;strips&#34; that keep the drives in place without having to screw in four screws to keep each drive in its tray. Fantastic product, and I'll continue to order more.
Once downloaded, the operating system installation should complete in a couple of minutes without a lot of issues. While upgrading the DSM operating system through the GUI is a simple task, downgrading to an earlier release of the DSM operating system is not possible through the DSM GUI - a remote telnet session is required to manipulate certain files in order to facilitate the installation of an earlier DSM version.The Synology DSM operating system offers a fantastic graphical user interface which implements HTML5 and CSS, displaying the interface in a web browser.
Possible "pretty GUI" distributions that you might use - "FreeNAS",  "ClearOS", "Zentyal", or just about any other distribution with Webmin installed. In fact, at this client I had done exactly that 8 years ago with FreeBSD, a SuperMicro chassis, hot swap RAID, etc. and you needed ear protection in the server room when that thing was running. That box sort of died due to heat in the server room (not my fault!
This box can do quite a bit--all while serving files at a rapid clip. I've used the mySQL service as well as the web and media server functions, but there's loads more to offer. The file manager is surprisingly useful (though I must say the Windows Storage Server's Explorer functionality is quite a bit better). Lastly the Synology Hybrid RAID is awesome. It allows for using drives of mixed size (with understandable caveats) as well as easily expanding volumes to additional disks.
Dropped connections frequently, and doesn't fully work in Safari, Chrome, or Firefox. I'm hoping this will be updated for DSM 5.0 (the newer OS).How I Use it:Backup: RAIDs are not backup, that's why everything goes to Crashplan. I use a Mac Mini to target the Synology and back it up, then two nightly clones to two attached 4TB drives (USB 3).
Enough to give me RAID-5 plus about a 50% spare in the box for growth over what I have now if I use 4TB drives. This excludes the additional space available by using the expansion units. b) it has 4 gigabit ethernet ports which I can provision as two bonded ports to yield 200 MB/sec for software development and the other 200 MB/sec for multimedia. c) It has two eSATA ports (expansion boxes or temporary single drives) and 4 USB ports.
You can avoid this very critical pitfall with three measures: 1. Have two parity drives (SHR-2 or RAID-6). 2. Once a failure occurs, backup your entire device PRIOR to rebuilding. 3. Have your device on a compatible UPS connected with USB so that power outage doesn't cause drive crash.Very important to know that WD RED drives are not rated for more than 5 in a box.
Wow. I cannot say enough good things about this Synology NAS. IT JUST WORKS. I am running with the DSM 4.3 and will upgrade to the new release 5.0 when it has been stable for some time. DSM is the management software that the end user interfaces with.I have 4 Western Digital RED 4 TB hard drives in here, set up in RAID 10.
DSM (the linux kernel/environment) loaded up nicely from windows. I simply followed the guided setup for creating the raid set (Volume 1) as RAID-5. It took 11 hours to run the parity checks on all 5 drives in volume1. DSM (the executive) requires a full surface scan of every new drive once. When completed, I had over 15TB of the 20TB (Raw) I had installed.
Answer: There would be no reason to re-install the DSM OS when changing RAID types. However you would lose all of the data on the RAID array when you switched.