Silly Question - Teh Forum

<body> <div id="header"> <span class="left"> <span class="back"><a href="lthread_list.php?webtag=DEFAULT"><span class="image mobile_back" title="Back"></span></a></span> <span class="image mobile_logo" title="Beehive Forum Logo"></span> </span> <ul> <li> <a class="reply_all" href="lpost.php?webtag=DEFAULT&reply_to=41647.0&return_msg=41647.1"> <span class="image mobile_reply_all"></span><span class="text">Reply to All</span> </a> </li> <li> <a class="navigation" href="#"> <span class="image mobile_navigation"></span><span class="text">Show messages</span> </a> </li> <li> <a class="main" href="#"><span class="image mobile_menu" title="Menu"></span> </a> </li> </ul> </div> <div class="menu main"> <ul> <li><a href="lthread_list.php?webtag=DEFAULT">Messages</a></li> <li><a href="lpm.php?webtag=DEFAULT">Inbox</a></li> <li><a href="lsearch.php?webtag=DEFAULT">Search</a></li> <li><a href="llogon.php?webtag=DEFAULT">Login</a></li> </ul> </div> <div class="menu navigation"><a href="lmessages.php?webtag=DEFAULT&msg=41647.1">1–10</a><a href="lmessages.php?webtag=DEFAULT&msg=41647.11">11–19</a></div> <div id="page_content"> <h3 class="thread_title"><a href="index.php?webtag=DEFAULT&amp;msg=41647.1">Silly Question</a> </h3> <div id="messages" data-navigation="41647_1_19_10"> <a name="a41647_1"></a><div class="message" id="message_41647_1"> <div class="message_header"> <div class="message_from"> From: Ken (SHIELDSIT)<span class="message_time">22 Dec 2015 01:44</span> <div class="clearer"></div> </div><div class="message_to">To: ALL<span class="message_count">1 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.1">41647.1</a></div> <div class="message_body"> Can someone here do the maths (good God, what have I become?) and tell me how much worse a 2 drive RAID-0 array is vs separate dual drives? I almost had myself talked into it being no different, but I now realize that's not true, but I don't know how much difference there is!<br /><br /> Thanks smart peeps.<br /><br /><span style="font-size:8px;">** Here's a softball for you PB!</span></div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.1&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.1"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_2"></a><div class="message" id="message_41647_2"> <div class="message_header"> <div class="message_from"> From: CHYRON (DSMITHHFX)<span class="message_time">22 Dec 2015 07:00</span> <div class="clearer"></div> </div><div class="message_to">To: Ken (SHIELDSIT) <span><span class="image post_read" title="Read: 22 Dec 2015 07:50"></span></span> <span class="message_count">2 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.2">41647.2</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_1" target="_self">41647.1</a></div> <div class="message_body"> Define "worse". RAID 0 is supposed to increase data throughput. YMMV, depending on various factors.<br /> <br /> <a href="https://en.m.wikipedia.org/wiki/Standard_RAID_levels#Performance">https://en.m.wikipedia.org/wiki/Standard_RAID_levels#Performance</a><div class="edit_text">EDITED: 22 Dec 2015 07:02 by DSMITHHFX</div> </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.2&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.2"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_3"></a><div class="message" id="message_41647_3"> <div class="message_header"> <div class="message_from"> From: Ken (SHIELDSIT)<span class="message_time">22 Dec 2015 07:50</span> <div class="clearer"></div> </div><div class="message_to">To: CHYRON (DSMITHHFX) <span><span class="image post_read" title="Read: 22 Dec 2015 10:32"></span></span> <span class="message_count">3 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.3">41647.3</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_2" target="_self">41647.2</a></div> <div class="message_body"> Without rereading what I wrote, I mean failure rates. How much faster will a raid 0 array fail over a single drive failing? Is it 50% faster due to doubling the drives?</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.3&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.3"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_4"></a><div class="message" id="message_41647_4"> <div class="message_header"> <div class="message_from"> From: CHYRON (DSMITHHFX)<span class="message_time">22 Dec 2015 10:34</span> <div class="clearer"></div> </div><div class="message_to">To: Ken (SHIELDSIT) <span><span class="image post_read" title="Read: 22 Dec 2015 10:54"></span></span> <span class="message_count">4 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.4">41647.4</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_3" target="_self">41647.3</a></div> <div class="message_body"> I don't believe the failure rate of the hardware is increased, but the risk of data loss is doubled (failure of either drive = total data loss).</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.4&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.4"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_5"></a><div class="message" id="message_41647_5"> <div class="message_header"> <div class="message_from"> From: Ken (SHIELDSIT)<span class="message_time">22 Dec 2015 10:55</span> <div class="clearer"></div> </div><div class="message_to">To: CHYRON (DSMITHHFX) <span><span class="image post_read" title="Read: 22 Dec 2015 13:37"></span></span> <span class="message_count">5 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.5">41647.5</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_4" target="_self">41647.4</a></div> <div class="message_body"> Correct, loss of data is what I was meaning. So there is no funky formula? It's just a straight up 50% increase?</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.5&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.5"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_6"></a><div class="message" id="message_41647_6"> <div class="message_header"> <div class="message_from"> From: Chris (CHRISSS)<span class="message_time">22 Dec 2015 12:08</span> <div class="clearer"></div> </div><div class="message_to">To: Ken (SHIELDSIT) <span><span class="image post_read" title="Read: 22 Dec 2015 14:53"></span></span> <span class="message_count">6 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.6">41647.6</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_5" target="_self">41647.5</a></div> <div class="message_body"> Does this help?</div> <div class="message_attachments"> <span>Attachments:</span> <ul> <li><span class="image attach"></span><a href="get_attachment.php?webtag=DEFAULT&hash=2cf985f19f1713102fc5e3421498ed29&filename=einsteinfieldeq.jpg" target="_blank">einsteinfieldeq.jpg</a></li> </ul> </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.6&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.6"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_7"></a><div class="message" id="message_41647_7"> <div class="message_header"> <div class="message_from"> From: CHYRON (DSMITHHFX)<span class="message_time">22 Dec 2015 13:38</span> <div class="clearer"></div> </div><div class="message_to">To: Chris (CHRISSS) <span><span class="image post_read" title="Read: 22 Dec 2015 13:58"></span></span> <span class="message_count">7 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.7">41647.7</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_6" target="_self">41647.6</a></div> <div class="message_body"> I was going to say that, but I didn't want to take Ken away from the drone snowplow project.</div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.7&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.7"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_8"></a><div class="message" id="message_41647_8"> <div class="message_header"> <div class="message_from"> From: CHYRON (DSMITHHFX)<span class="message_time">22 Dec 2015 13:50</span> <div class="clearer"></div> </div><div class="message_to">To: Ken (SHIELDSIT) <span><span class="image post_read" title="Read: 22 Dec 2015 14:53"></span></span> <span class="message_count">8 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.8">41647.8</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_5" target="_self">41647.5</a></div> <div class="message_body"> Probably more highly influenced by brand/model/age of drive(s) than anything else. Let's say you have a brand-new hdd with a statistical 4% failure rate<em> </em>(I think this is fairly common among consumer-grade hdds -- the rate goes up with age). If you have another 'identical' drive coupled with the first in RAID 0, you now have a statistical failure rate of 8%. Complicated by the fact that it is much easier to recover some or all data from a failing single drive, than from a failed RAID 0.<br /><br /> If you want some of the performance boost of RAID 0 with the redundancy of RAID 1, use RAID 1+0 (aka RAID 10), at the expense of ½ the total hdd capacity.<br /><br /> IANA mathematician, this is just some half-remembered shit I read somewhere a year ago.<div class="edit_text">EDITED: 22 Dec 2015 13:52 by DSMITHHFX</div> </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.8&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.8"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_9"></a><div class="message" id="message_41647_9"> <div class="message_header"> <div class="message_from"> From: graphitone<span class="message_time">22 Dec 2015 15:40</span> <div class="clearer"></div> </div><div class="message_to">To: CHYRON (DSMITHHFX) <span><span class="image post_read" title="Read: 22 Dec 2015 16:05"></span></span> <span class="message_count">9 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.9">41647.9</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_8" target="_self">41647.8</a></div> <div class="message_body"> <div class="quotetext"><strong>Quote:</strong> </div> <div class="quote">If you want some of the performance boost of RAID 0 with the redundancy of RAID 1, use RAID 1+0 (aka RAID 10), at the expense of ½ the total hdd capacity</div> <p>Aye, a mirrored stripe. Does that mean 4 drives, or is there a more efficient way of doing things?<br /> </p> </div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.9&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.9"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div><a name="a41647_10"></a><div class="message" id="message_41647_10"> <div class="message_header"> <div class="message_from"> From: CHYRON (DSMITHHFX)<span class="message_time">22 Dec 2015 16:08</span> <div class="clearer"></div> </div><div class="message_to">To: graphitone <span><span class="image post_read" title="Read: 22 Dec 2015 16:26"></span></span> <span class="message_count">10 of 19</span><div class="clearer"></div> </div> </div> <div class="message_links"> <a href="lmessages.php?webtag=DEFAULT&msg=41647.10">41647.10</a> In reply to <a href="lmessages.php?webtag=DEFAULT&msg=41647.1#a41647_9" target="_self">41647.9</a></div> <div class="message_body"> Apparently it can be done with only two:<br /><br /> <a href="https://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_10_.28RAID_1.2B0.29">https://en.wikipedia.org/wiki/Nested_RAID_levels#RAID_10_.28RAID_1.2B0.29</a></div> <div class="message_footer"> <div class="message_footer_links"><a href="lpost.php?webtag=DEFAULT&reply_to=41647.10&return_msg=41647.1" class="reply"><span class="image post"></span>Reply</a></div> <div class="message_vote_form" data-msg="41647.10"> <span class="rating">0/0</span> <span class="image vote vote_down vote_down_off" title="Vote Down"></span> <span class="image vote vote_up vote_up_off" title="Vote Up"></span> </div> </div> </div></div> <div class="message_page_footer"> <ul> <li class="right_col"><form accept-charset="utf-8" method="get" action="lmessages.php" target="_self"><input type="hidden" name="webtag" id="webtag" class="bhinputtext" value="DEFAULT" dir="ltr" /><input type="hidden" name="msg" id="msg" class="bhinputtext" value="41647.11" dir="ltr" /><input type="submit" name="submit" id="keep_reading" value="Keep reading…" class="button" /></form></li> </ul> </div> </div> </body>