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<div class="moz-cite-prefix">On 09/02/2014 10:23 AM, Mark Phillips
wrote:<br>
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<div dir="ltr">I am looking at a new Linux laptop, and I have the
option of a mSata SSD drive or a conventional drive. I am
considering a 1 TB Samsung 840 EVO mSata SSD for the OS and all
my partitions.
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1. Are there any reasons not to use a SSD for the full disk,
as opposed to just for the OS? Other than saving money, as a
small SSD would cost a lot less!</div>
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None I can think of, I do this with mine. I slice out root, var,
var/log, usr, and home to lvm's, usually adding another dump slice
under /mnt for "everything else" including vm images and such across
the whole disk. I do not however provision all the vg space,
reserving it for another slice, lvextending, etc case I run out of
space elsewhere.<br>
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<div>2. I have seen recommendations on the net to backup the
drive to a spinning drive. The laptop has a couple of bays, so
I could put a back up drive in one of the bays. Does this make
sense, or have SSDs matured enough that they will last like a
spinning drive?</div>
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You'll want to do the optimizations still. I have a pretty complex
setup I have to build at an initrd usually outside of installers,
aligning blocks/chunks across disparate filesystems from mdraid,
cryptsetup, lvm, to ext4. I don't use trim (cryptsetup
vulnerabilities), but it's possible to do full-stack traversal like
that apparently.<br>
<br>
See also:
<a class="moz-txt-link-freetext" href="http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/">http://blog.neutrino.es/2013/howto-properly-activate-trim-for-your-ssd-on-linux-fstrim-lvm-and-dmcrypt/</a><br>
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<div><br>
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<div>3. Anything else I should be aware of when moving to the
world of SSDs?</div>
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Yes, they die. Often in my experience. I never NOT raid1 them
now. My first I thought it'd be cool to raid0, and holy crap it was
fast. Then one (thus all my data) died after 2 months. Raid1 ftw
from here out. I have way too much proprietary data to not keep it
resilient (mdadm), keep it secure (cryptsetup), and keep it flexible
(lvm).<br>
<br>
I've used them from the first gen sandforce and micron chips, they
all die at some point. Most lasting recently was my old adata
sandforce2+ drives, but one would randomly fall out of raid, but
this could have also been my mobo sucking (intel p65, with the oob
crap southbridge). <br>
<br>
Along the way I perfected my install to the point the ssd's keep
lasting longer, so I like to think it's that, but really not sure if
hw is getting better, or I'm better at not slaughtering them with
io. <br>
<br>
I'm currently using 2x mx100 512gb ssd's in my desktop and 2x
samsung 840 512gb msata's in my dell e7420 that knock on wood has
been great, both raid1 only. I've never not been able to recover
data off a raid1 config with linux when one fails.<br>
<br>
Happy to share my setup steps, latest to do this with mint, but
sorta works with ubuntu other than their installers being terrible
about dealing with me shifting the fs about under it. I gave up
doing this with 14.04, they crippled it entirely for this sort of
setup.<br>
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<div>Thanks,</div>
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<div>Mark</div>
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