Chris's Wiki :: blog/sysadmin/MovingToThreeWayMirrors Commentshttps://utcc.utoronto.ca/~cks/space/blog/sysadmin/MovingToThreeWayMirrors?atomcommentsDWiki2020-04-15T08:55:54ZRecent comments in Chris's Wiki :: blog/sysadmin/MovingToThreeWayMirrors.By dozzie on /blog/sysadmin/MovingToThreeWayMirrorstag:CSpace:blog/sysadmin/MovingToThreeWayMirrors:852a3c641073f7ecad2d5d3f669be2f7949cf528dozzie<div class="wikitext"><blockquote><p>What exactly makes a "hot-swappable" disk bay?</p>
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<p>Disk chassis, mainly. Not all are designed that you can remove a disk while the server is operating, e.g. some servers may not have the disk bays exposed on the front panel at all.</p>
<p>@cks: There's always the option of using two-way mirror with a hot spare (MD RAID can to do that) or with an unused disk that will get added to the RAID when one of the used disks fails. Not sure if there's much benefit in doing so; maybe for SSDs (less writes), or that it preserves the current setup.</p>
</div>2020-04-15T08:55:54ZFrom 78.58.206.110 on /blog/sysadmin/MovingToThreeWayMirrorstag:CSpace:blog/sysadmin/MovingToThreeWayMirrors:21980d31f4f2f70bc95c67b3ddeddc67dcd66a10From 78.58.206.110<div class="wikitext"><p>What exactly makes a "hot-swappable" disk bay? I had assumed that all SAS and SATA connections are always hot-swappable, with maybe the only difference being whether the OS gets automatically poked about new connections or not...</p>
<p>(My personal HP MicroServer also says "non-hotswap", but it seems that in HP's language that only means the trays don't have any of the fancy electronics but doesn't stop the controller from correctly reporting new or removed disks to Linux, which just leaves me even more confused about it.)</p>
</div>2020-04-15T06:42:28Z