SSDs

[Michael Butash]

Sector/heads rather I'd meant, wrong term.  Having to finagle fdisk 
specifically to align to the ssd's geometry with -S -H.

I had problems with the bootsector offset stuff between ssd, ata 
controllers, and installers by default until I did, having to trial and 
error learn manually to get ubuntu happy and efficiently aligned 
pre-install.  Was not fun nor intuitive (with bugs hit), but apparently 
necessary.  Two devices were two different methods, same ata disk 
geometry between them.

It'd be great if an installer could account for things like erase head 
sizing from hdparm data to adjust fs/partitions, not sure any really do 
yet, or..?

-mb


On 04/20/2013 12:53 PM, Stephen wrote:
> there is no cylinder alignment really in a SSD anymore...
>
>
> On Sat, Apr 20, 2013 at 12:18 PM, Michael Butash <michael at butash.net
> <mailto:michael at butash.net>> wrote:
>
>     So I bought a samsung 840, I'll be using it on a single-disk system,
>     requiring encryption (luks), and lvm/btrfs.  Might actually try
>     btrfs finally now, but this is for work.  Just curious your opinion
>     about the firmware side to expect these days losing trim support
>     with fs layers, but relying on built-in firmware auto-leveling.
>
>     Most of what Lisa suggested to do I normally do already, I just
>     still do manual alignment of cylindars of the disk for flash
>     geometry (or plan to).  Is that even needed still for non-gpt
>     installs (like ubuntu)?
>
>     Longevity seems almost a crapshoot with ssd's at times, so just
>     curious to know what enterprise storage systems use on the back end
>     with ssd to keep them from dying with layers of raid and such.
>
>     I did buy the samsung 840 "pro" disk, just curious what makes it so
>     pro vs cheaper 840 (~$50 diff).  Since single disk, I'm hoping it
>     holds up longer.
>
>     Thanks in advance!
>
>     -mb
>
>
>     On 04/02/2013 02:05 PM, Alan Dayley wrote:
>
>         An SSD from a well known manufacturer will last longer and be faster
>         than any rotating hard drive. The controllers and firmware in
>         the drive
>         are designed to compensate for wear-out problems. Buy something from
>         Intel, Samsung, OCZ or STEC and you will be just fine.
>
>         (I was a firmware engineer for an SSD company for 11.9 years. I
>         don't
>         have time right now to give a detailed answer. Just trust me. ;-) )
>
>         Alan
>
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>
> --
> A mouse trap, placed on top of your alarm clock, will prevent you from
> rolling over and going back to sleep after you hit the snooze button.
>
> Stephen