As the drives in question are SSDs, they will rebuild faster than regular SATA
or SAS drives.
Still, RAID6 is better than RAID5 for timely recovery due to the above…


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On Fri, Sep 16, 2016 1:26 PM, Mark Gottschalk

It claims a 50% chance of
rebuild failure in a RAID5 array with 7 1-TB drives.  Your disks are
only 500GB, but there are 8 of them.  Someone else will have to do
the math on that.  The consensus starting several years ago (the article
is from 2009) is that RAID 5 is dead due to the very high chance (approaching
100% with large drives) of a URE during rebuild, thus rendering a RAID
5 array a false sense of security and not actually robust/redundant at

Another article about OBR10
(one big raid 10) being the current standard for server storage:

There are always exceptions,
and yours could justifiably be one of them.  Don't know and don't
want to debate it (plenty of that in the SpiceWorks comments). Just sending
some info I was previously aware of.

-- Mark

From:J- P <>
To:NT <>
Date:09/16/2016 06:18 AM
Subject:[NTSysADM] raid
5? in 2016
Sent by:<>


So I inherited this server , (sitting on
site since February) low and behold when I fire it up it turns out that
whoever set it up used all 8 discs in a raid 5 (granted they are only 500gb
enterprise ssd's ) but still raid 5? and no hot spare?

I'm trying to figure what the purpose of
this server is/was, but aside from a losing some space wouldn't a  raid
6 and hot spare make MUCH more sense?

I'd like to move some of their VMs to it,
as it is a brand spanking new r730 with 96gb of ram

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