{"id":966,"date":"2014-11-26T05:25:57","date_gmt":"2014-11-26T05:25:57","guid":{"rendered":"http:\/\/poojanwagh.opalstacked.com\/techblog\/?p=966"},"modified":"2014-11-26T05:25:57","modified_gmt":"2014-11-26T05:25:57","slug":"crucial-m550-128gb-as-zilslog-the-zil-really-does-limit-your-performance","status":"publish","type":"post","link":"https:\/\/tech.poojanblog.com\/blog\/unix-linux\/crucial-m550-128gb-as-zilslog-the-zil-really-does-limit-your-performance\/","title":{"rendered":"Crucial m550 128GB as ZIL\/SLOG (the ZIL really does limit your performance)"},"content":{"rendered":"<p>I got my hands on an m550 128GB drive (for around $75 with the recent pre-Thanksgiving\/pre-Christmas discounts).<\/p>\n<p>Here are some comparisons between my old ZIL (the m500 128GB) and the new one:<\/p>\n<table>\n<tr>\n<th>ZIL<\/th>\n<th>Throughput (sustained) MB\/s<\/th>\n<\/tr>\n<tr>\n<td>none<\/td>\n<td>195.6<\/td>\n<\/tr>\n<tr>\n<td>m500 128GB<\/td>\n<td>124.0<\/td>\n<\/tr>\n<tr>\n<td>m550 128GB<\/td>\n<td>265.9<\/td>\n<\/tr>\n<\/table>\n<p>Here are some snippets of <code>zpool isotat<\/code> output:<\/p>\n<h2>No ZIL<\/h2>\n<pre>\r\n2014-11-25 22:07:33,635 - 16777216000 bytes written in 85.77223777770996 seconds 195.60193874713124 MB\/s\r\n<\/pre>\n<pre>\r\npool                    alloc   free   read  write   read  write\r\n----------------------  -----  -----  -----  -----  -----  -----\r\ntank                    6.81T  1.07T      0  1.34K      0   171M\r\n  raidz1                6.81T  1.07T      0  1.34K      0   171M\r\n    gpt\/TOSH-3TB-A          -      -      0    689      0  85.5M\r\n    gpt\/TOSH-3TB-B          -      -      0    664      0  82.5M\r\n    gpt\/SGT-SATA-4TB-A      -      -      0    691      0  85.7M\r\ncache                       -      -      -      -      -      -\r\n  gpt\/tank_cache0        174G  16.0M     10      4   159K   142K\r\n----------------------  -----  -----  -----  -----  -----  -----\r\n<\/pre>\n<h2>m500 128GB as ZIL<\/h2>\n<pre>\r\n2014-11-25 22:04:18,505 - 16777216000 bytes written in 135.25676941871643 seconds 124.03975100175961 MB\/s\r\n<\/pre>\n<pre>\r\n                           capacity     operations    bandwidth\r\npool                    alloc   free   read  write   read  write\r\n----------------------  -----  -----  -----  -----  -----  -----\r\ntank                    6.80T  1.07T      0  2.93K      0   255M\r\n  raidz1                6.80T  1.07T      0  1.09K      0   130M\r\n    gpt\/TOSH-3TB-A          -      -      0    545      0  65.3M\r\n    gpt\/TOSH-3TB-B          -      -      0    543      0  65.3M\r\n    gpt\/SGT-SATA-4TB-A      -      -      0    542      0  65.3M\r\nlogs                        -      -      -      -      -      -\r\n  gpt\/tank_log0         1.88G  29.9G      0  1.84K      0   125M\r\ncache                       -      -      -      -      -      -\r\n  gpt\/tank_cache0        174G      0      0    636      0  78.8M\r\n----------------------  -----  -----  -----  -----  -----  -----\r\n<\/pre>\n<h2>m550 128GB as ZIL<\/h2>\n<pre>\r\n2014-11-25 22:34:07,025 - 16777216000 bytes written in 63.09663510322571 seconds 265.89715873996414 MB\/s\r\n<\/pre>\n<pre>\r\n                           capacity     operations    bandwidth\r\npool                    alloc   free   read  write   read  write\r\n----------------------  -----  -----  -----  -----  -----  -----\r\ntank                    6.78T  1.09T      0  5.47K      0   467M\r\n  raidz1                6.78T  1.09T      0  1.85K      0   221M\r\n    gpt\/TOSH-3TB-A          -      -      0    916      0   109M\r\n    gpt\/TOSH-3TB-B          -      -      0    913      0   108M\r\n    gpt\/SGT-SATA-4TB-A      -      -      0    930      0   111M\r\nlogs                        -      -      -      -      -      -\r\n  gpt\/tank_log0         2.19G  29.6G      0  3.62K      0   246M\r\ncache                       -      -      -      -      -      -\r\n  gpt\/tank_cache0       2.09G   172G      0    645      0  79.8M\r\n----------------------  -----  -----  -----  -----  -----  -----\r\n\r\n                           capacity     operations    bandwidth\r\npool                    alloc   free   read  write   read  write\r\n----------------------  -----  -----  -----  -----  -----  -----\r\ntank                    6.80T  1.08T      0  6.58K      0   564M\r\n  raidz1                6.80T  1.08T      0  2.25K      0   270M\r\n    gpt\/TOSH-3TB-A          -      -      0  1.09K      0   134M\r\n    gpt\/TOSH-3TB-B          -      -      0  1.11K      0   136M\r\n    gpt\/SGT-SATA-4TB-A      -      -      0  1.08K      0   133M\r\nlogs                        -      -      -      -      -      -\r\n  gpt\/tank_log0         2.19G  29.6G      0  4.33K      0   294M\r\ncache                       -      -      -      -      -      -\r\n  gpt\/tank_cache0       4.88G   170G      0    633      0  78.2M\r\n----------------------  -----  -----  -----  -----  -----  -----\r\n<\/pre>\n<\/p>\n<div class='wp_likes' id='wp_likes_post-966'><a class='like' href=\"javascript:wp_likes.like(966);\" title='' ><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/tech.poojanblog.com\/blog\/wp-content\/plugins\/wp-likes\/images\/like.png\" alt='' border='0'\/><\/a><span class='text'>Be the first to like.<\/span><\/p>\n<div class='like' ><a href=\"javascript:wp_likes.like(966);\">Like<\/a><\/div>\n<div class='unlike' ><a href=\"javascript:wp_likes.unlike(966);\">Unlike<\/a><\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>I got my hands on an m550 128GB drive (for around $75 with the recent pre-Thanksgiving\/pre-Christmas discounts). Here are some comparisons between my old ZIL (the m500 128GB) and the new one: ZIL Throughput (sustained) MB\/s none 195.6 m500 128GB 124.0 m550 128GB 265.9 Here are some snippets of zpool isotat output: No ZIL 2014-11-25 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[10],"tags":[174,210,129,3,191],"class_list":["post-966","post","type-post","status-publish","format-standard","hentry","category-unix-linux","tag-benchmark","tag-slog","tag-ssd","tag-zfs","tag-zil"],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/posts\/966","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/comments?post=966"}],"version-history":[{"count":2,"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/posts\/966\/revisions"}],"predecessor-version":[{"id":976,"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/posts\/966\/revisions\/976"}],"wp:attachment":[{"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/media?parent=966"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/categories?post=966"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tech.poojanblog.com\/blog\/wp-json\/wp\/v2\/tags?post=966"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}