home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
linuxmafia.com 2016
/
linuxmafia.com.tar
/
linuxmafia.com
/
kb
/
Hardware
/
ssd-wearout
< prev
next >
Wrap
Internet Message Format
|
2016-01-19
|
1KB
Date: Tue, 19 Jan 2016 23:11:22 +0000
From: James Harper <james@ejbdigital.com.au>
To: "luv-main@luv.asn.au" <luv-main@luv.asn.au>,
Subject: RE: Mail Server Really Slow
If you use SSDs for any sort of intensive storage, do keep an eye on the
SMART "media wearout" values, and replace them before the counter hits 0
(or 1). For the disks we were using (Intel DataCentre SSDs), the docs
say that while the disk may well keep running for a long time after the
counter hits 1, it is considered worn out and is no longer covered by
warranty. SMART does not consider this a failure/old age (the threshold
is 0 but the counter never goes below 1), so you have to actually
monitor the counter. The RAID controller probably won't tell you this
either (that the disk has worn out), and in our case the performance
went to crap sometime after the counter hit 1, causing considerable
frustration to all involved. Different models and manufacturers
obviously differ in this respect too.
I'm seeing time-to-replacement of about 12 months on high load system
where the SSDs are used for a RAID cache (ZFS, Intel RAID controllers,
etc). At home, my little router that is just a laptop running Squid, has
used up 2 of 100 SMART units in the ~12 months it has been running.
Not particularly relevant to the discussion at hand, but with
suggestions of "put in SSDs and all your trouble will go away", it is
something you need to consider.
James