<div dir="ltr"><br><div class="gmail_extra"><br><br><div class="gmail_quote">19 января 2014 г., 18:55 пользователь Alexey Shabalin <span dir="ltr"><<a href="mailto:a.shabalin@gmail.com" target="_blank">a.shabalin@gmail.com</a>></span> написал:<br>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">Добрый вечер.<div><br></div><div>Господа, у меня до четверга(23.01) есть свободный сервер для тестов.</div>
<div>Меня интересует сравнение lvm поверх mdadm и raid средствами lvm (без mdadm).</div><div>Какие средства для тестирования рекомендуете?</div>
<div>Я пока остановился на fio. Может порекомендуете какие параметры для него правильно использовать? может у кого-то есть готовые шаблоны?<br clear="all"><div><br></div><div>Спасибо!</div><div><br></div><div>PS: обновленные lvm и fio отправил в сизиф :) для чистоты экспериментов.</div>
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<div><br></div></font></span></div></div></blockquote><div> </div></div><div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px"><div class="gmail_quote">Потестировал. </div>Вывалю сюда некоторые результаты, может поможете их интерпретировать.</div>
<div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px"><br></div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">Под рукой оказался сервер ibm x3550 m4 с 32 ядрами 2GHz и 128 Гб опреативки. И только 3 HDD (подключенные корзины не использовал).<br>
</div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px"><br></div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">За основу брал скрипты отсюда:</div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">
<a href="http://louwrentius.com/benchmark-results-of-random-io-performance-of-different-raid-levels.html" target="_blank">http://louwrentius.com/benchmark-results-of-random-io-performance-of-different-raid-levels.html</a><br>
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<br>Скриптами создавались раид с помощью mdadm, lvm поверх mdadm, только lvm с параметрами --type raid1 и --type raid5 -i 2.</div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">Возможно поэтому реальные результаты могут отличаться, т.к. времени на синхронизацию раидов не давал, и диски помимо тестов еще заняты были синхронизацией.</div>
<div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px"><br></div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">остальное в атаче.</div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">
<br></div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">По графикам вижу провал у lvm --type raid1 при чтении.</div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">
Почему-то запись на простой mdadm raid хуже, чем при использовании поверх lvm или lvm --type raid5. возможно для lvm где-то не отключил буферы или кэширование.</div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">
<br></div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">А в остальном, lvcreate --type raidX вполне можно использовать вместо связки lvm-on-mdadm.</div></div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">
<br></div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px">ссылки на результаты тестов и графики.</div><div class="gmail_extra" style="font-family:arial,sans-serif;font-size:14px"><br><div class="gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:#f5f5f5;padding:5px;color:#222;font-family:arial;font-style:normal;font-weight:bold;font-size:13px;border:1px solid #ddd">
<a href="https://docs.google.com/file/d/0B_nxjPw-zbJBYUU0T0pVVER3blE/edit?usp=drive_web" target="_blank" style="display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;padding:1px 0px;border:none;width:100%"><img style="vertical-align: bottom; border: none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_10_generic_list.png"> <span dir="ltr" style="color:#15c;text-decoration:none;vertical-align:bottom">test2.tar.xz</span></a></div>
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<a href="https://docs.google.com/file/d/0B_nxjPw-zbJBNVJXX1NwU0tFQlk/edit?usp=drive_web" target="_blank" style="display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;padding:1px 0px;border:none;width:100%"><img style="vertical-align: bottom; border: none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_11_image_list.png"> <span dir="ltr" style="color:#15c;text-decoration:none;vertical-align:bottom">compare-raid-1-write-depth-32-bw-2Draw.png</span></a></div>
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<a href="https://docs.google.com/file/d/0B_nxjPw-zbJBNlp6N2NkdWNRbWs/edit?usp=drive_web" target="_blank" style="display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;padding:1px 0px;border:none;width:100%"><img style="vertical-align: bottom; border: none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_11_image_list.png"> <span dir="ltr" style="color:#15c;text-decoration:none;vertical-align:bottom">compare-raid-5-write-depth-32-iops-2Dsmooth.png</span></a></div>
<br><div class="gmail_drive_chip" style="width:396px;height:18px;max-height:18px;background-color:#f5f5f5;padding:5px;color:#222;font-family:arial;font-style:normal;font-weight:bold;font-size:13px;border:1px solid #ddd">
<a href="https://docs.google.com/file/d/0B_nxjPw-zbJBM0NlcjR1S0FicFk/edit?usp=drive_web" target="_blank" style="display:inline-block;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-decoration:none;padding:1px 0px;border:none;width:100%"><img style="vertical-align: bottom; border: none;" src="https://ssl.gstatic.com/docs/doclist/images/icon_11_image_list.png"> <span dir="ltr" style="color:#15c;text-decoration:none;vertical-align:bottom">compare-raid-1-write-depth-32-iops-2Dtrend.png</span></a></div>
<br></div>-- <br>Alexey Shabalin<br><br><br><br>
</div></div>