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Andrea Mazzoleni 2016-01-30 22:56:31 +01:00
parent c070107568
commit 31d6b387c6
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@ -57,9 +57,6 @@ No integrity checksum is supported.
- Commercial and proprietary C++/Java application for Windows, with some limited support for Linux.
It supports both snapshot redundancy and real-time redundancy, with integrity checksum.
</li>
<li><a href="http://www.vilett.com/disParity/forum/">disParity</a>
- Proprietary .NET application for Windows supporting snapshot redundancy and integrity checksum.
</li>
<li><a href="http://en.wikipedia.org/wiki/ZFS">ZFS</a>
- OpenSource filesystem (but GPL incompatible) with real-time redundancy and integrity checksum.
</li>
@ -93,20 +90,20 @@ and if <span class="bold">all your disks are spinning when reading one file</spa
</p>
<table class="compare">
<tr><th width="30%"></th><th><span class="bold">SnapRAID</span></th><th>unRAID</th><th>FlexRAID</th><th>disParity</th><th>ZFS</th><th>Btrfs</th><th>Storage Spaces</th></tr>
<tr><th width="30%"></th><th><span class="bold">SnapRAID</span></th><th>unRAID</th><th>FlexRAID</th><th>ZFS</th><th>Btrfs</th><th>Storage Spaces</th></tr>
<tr><td><span class="bold">Redundancy model</span><br>Real-time computes parity at real-time like RAID,
snapshot at request time, like Backup.</td>
<td>Snapshot</td><td>Real-time</td><td>Real-time<br>Snapshot</td><td>Snapshot</td><td>Real-time<br>Snapshot</td><td>Real-time<br>Snapshot</td><td>Real-time</td></tr>
<td>Snapshot</td><td>Real-time</td><td>Real-time<br>Snapshot</td><td>Real-time<br>Snapshot</td><td>Real-time<br>Snapshot</td><td>Real-time</td></tr>
<tr><td><span class="bold">Integrity</span><br>
If data is validated with some kind of checksum,
and which one is the default.</td>
<td>Yes<br>SpookyHash<br>128 bit</td><td>No</td><td>Yes<br>Adler32<br>32 bit</td><td>Yes<br>MD5<br>128 bit</td><td>Yes<br>fletcher4<br>256 bit</td><td>Yes<br>CRC32C<br>32 bit</td><td>No</td></tr>
<td>Yes<br>SpookyHash<br>128 bit</td><td>No</td><td>Yes<br>Adler32<br>32 bit</td><td>Yes<br>fletcher4<br>256 bit</td><td>Yes<br>CRC32C<br>32 bit</td><td>No</td></tr>
<tr><td><span class="bold">Fix silent errors</span><br>
If silent errors are detected and fixed before they can propagate into the parity.</td>
<td>Yes</td><td>No <a href="#note1">[1]</a></td><td>No <a href="#note2">[2]</a></td><td>No</td><td>Yes <a href="#note3">[3]</a></td><td>Yes <a href="#note3">[3]</a></td><td>No</td></tr>
<td>Yes</td><td>No <a href="#note1">[1]</a></td><td>No <a href="#note2">[2]</a></td><td>Yes <a href="#note3">[3]</a></td><td>Yes <a href="#note3">[3]</a></td><td>No</td></tr>
<!---
Silent error discussion in UnRAID Forum:
@ -133,20 +130,20 @@ http://www.openegg.org/forums/posts/list/727.page
<tr><td><span class="bold">Number of failures</span><br>
How many disk failures are supported? 1 is for RAID5, 2 for RAID6.
</td>
<td>1 2 3 4 5 6</td><td>1</td><td>1 2 3 4 5 6+</td><td>1</td><td>1 2 3</td><td>1 2</td><td>1</td></tr>
<td>1 2 3 4 5 6</td><td>1</td><td>1 2 3 4 5 6+</td><td>1 2 3</td><td>1 2</td><td>1</td></tr>
<tr><td><span class="bold">Other failures</span><br>If more disks fail than the supported redundancy model,
is it possible to recover the data in the not failed disks?</td>
<td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td><td>No</td><td>No</td><td>No</td></tr>
<td>Yes</td><td>Yes</td><td>Yes</td><td>No</td><td>No</td><td>No</td></tr>
<tr><td><span class="bold">Power/Noise</span><br>How many disks are spinning when reading a single file?</td>
<td>One</td><td>One</td><td>One</td><td>One</td><td>All</td><td>All</td><td>All</td></tr>
<td>One</td><td>One</td><td>One</td><td>All</td><td>All</td><td>All</td></tr>
<tr><td><span class="bold">Filled disks</span><br>Can you start with already filled disks?</td>
<td>Yes</td><td>Partial<a href="#note4">[4]</a></td><td>Yes</td><td>Yes</td><td>No</td><td>No</td><td>No</td></tr>
<td>Yes</td><td>Partial<a href="#note4">[4]</a></td><td>Yes</td><td>No</td><td>No</td><td>No</td></tr>
<tr><td><span class="bold">Add disks</span><br>Can you add disks at later time?</td>
<td>Yes</td><td>Yes</td><td>Yes</td><td>Yes</td><td>No<a href="#note5">[5]</a></td><td>Yes</td><td>Yes</td></tr>
<td>Yes</td><td>Yes</td><td>Yes</td><td>No<a href="#note5">[5]</a></td><td>Yes</td><td>Yes</td></tr>
<!--
ZFS does't allow to add new disks to a raidz pool
@ -154,10 +151,10 @@ http://serverfault.com/questions/190207/how-can-i-add-one-disk-to-an-existing-ra
-->
<tr><td><span class="bold">Operating system</span><br>Which OS is supported?</td>
<td>Linux<br>Windows<br>Mac&nbsp;OS&nbsp;X<br>OpenIndiana<br>Solaris<br>BSD</td><td>Linux</td><td>Windows<br>Linux</td><td>Windows</td><td>Linux <a href="#note6">[6]</a><br>Mac&nbsp;OS&nbsp;X<br>OpenIndiana<br>Solaris<br>BSD</td><td>Linux</td><td>Windows</td></tr>
<td>Linux<br>Windows<br>Mac&nbsp;OS&nbsp;X<br>OpenIndiana<br>Solaris<br>BSD</td><td>Linux</td><td>Windows<br>Linux</td><td>Linux <a href="#note6">[6]</a><br>Mac&nbsp;OS&nbsp;X<br>OpenIndiana<br>Solaris<br>BSD</td><td>Linux</td><td>Windows</td></tr>
<tr><td><span class="bold">Age</span><br>The year of the first official release supporting at least RAID5 redundancy.</td>
<td>2011</td><td>2005</td><td>2008</td><td>2009</td><td>2005</td><td>2013</td><td>2012</td></tr>
<td>2011</td><td>2005</td><td>2008</td><td>2005</td><td>2013</td><td>2012</td></tr>
<!---
ZFS 2009 is the data of the "Triple-Parity RAID-Z" article by Adam Leventhal
@ -170,13 +167,13 @@ http://www.eecs.berkeley.edu/Pubs/TechRpts/1987/5853.html
<tr><td><span class="bold">License/Price</span><br>
Software license and price.
</td>
<td>Open Source GPL3<br>Free</td><td>Open Source GPL2<br>89$/129$</td><td>Proprietary<br>40$/60$</td><td>Proprietary<br>Free</td><td>Open Source CDDL<br>Free</td><td>Open Source GPL2<br>Free</td><td>Proprietary<br>Windows 8</td></tr>
<td>Open Source GPL3<br>Free</td><td>Open Source GPL2<br>89$/129$</td><td>Proprietary<br>40$/60$</td><td>Open Source CDDL<br>Free</td><td>Open Source GPL2<br>Free</td><td>Proprietary<br>Windows 8</td></tr>
<tr><td><span class="bold">Interface</span><br>Which interface is provided? GUI or command line?</td>
<td>
command line<br>or <a href="http://elucidate.codeplex.com/">Elucidate</a> GUI,
or plugin for for <a href="http://www.openmediavault.org/">OpenMediaVault</a>
</td><td>command line<br>GUI</td><td>GUI</td><td>command line</td><td>command line<br>GUI/Plugins <a href="#note7">[7]</a></td><td>command line</td><td>GUI</td></tr>
</td><td>command line<br>GUI</td><td>GUI</td><td>command line<br>GUI/Plugins <a href="#note7">[7]</a></td><td>command line</td><td>GUI</td></tr>
</table>