{"id":760973,"date":"2020-05-27T08:26:40","date_gmt":"2020-05-27T12:26:40","guid":{"rendered":"https:\/\/www.prime-wow.com\/?p=760973"},"modified":"2020-05-27T08:26:40","modified_gmt":"2020-05-27T12:26:40","slug":"return-to-raid-the-ars-readers-what-if-edition","status":"publish","type":"post","link":"https:\/\/www.prime-wow.com\/?p=760973","title":{"rendered":"Return to RAID: The Ars readers \u201cWhat If?\u201d edition"},"content":{"rendered":"
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\"I<\/p>\n

Enlarge<\/a> \/<\/span> I get anxious if I can’t watch the blinkenlights in the big Terminal window in the background while the tests run. (credit: Jim Salter)<\/p>\n<\/figure>\n

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In earlier coverage pitting ZFS against Linux kernel RAID, some readers had some concerns that we had missed some tricks for mdraid tuning. In particular, Louwrentius wanted<\/a>\u00a0us to retest mdadm with bitmaps disabled, and targetnovember thought<\/a>\u00a0that perhaps XFS might outperform ext4.<\/p>\n

Write intent\u00a0bitmaps<\/a> are an mdraid feature that allows disks that have dropped off and re-entered the array to resync\u00a0rather than rebuild from scratch. The “age” of the bitmap on the returning disk is used to determine what data has been written in its absence\u2014which allows it to be updated with the new data only, rather than rebuilt from scratch.<\/p>\n

XFS and ext4 are simply two different filesystems. Ext4 is the default root filesystem on most distributions, and XFS is an enterprise heavy-hitter most commonly seen in arrays in the hundreds or even thousands of tebibytes. We tested both this time, with bitmap support disabled.<\/p>\n<\/div>\n

Read 20 remaining paragraphs<\/a> | Comments<\/a><\/p>\n

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\nSource: Ars Technica – Return to RAID: The Ars readers \u201cWhat If?\u201d edition<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

Enlarge \/ I get anxious if I can’t watch the blinkenlights in the big Terminal window in the background while the tests run. (credit: Jim Salter) In earlier coverage pitting ZFS against Linux kernel RAID, some readers had some concerns … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":760974,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"ngg_post_thumbnail":0,"footnotes":""},"categories":[27,110],"tags":[73],"class_list":["post-760973","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ars-technica","category-unfiltered-rss","tag-ars-technica"],"_links":{"self":[{"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/posts\/760973","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=760973"}],"version-history":[{"count":0,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/posts\/760973\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=\/wp\/v2\/media\/760974"}],"wp:attachment":[{"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=760973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=760973"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.prime-wow.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=760973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}