[molpro-user] flash solid state drives

[Pedro Jorge Caridade]

Sorry to enter in the nice ideas exchange. I would like to have also
some expert opinion regarding SSD. I always avoided using SSD for
scratch due to the "number of times" of I/O limit. Is this a real
problem in the SSD enterprise versions?

Since we are in the process of buying additional machines, the vendor
proposed SAS disks (6Gbps). Does any body have any comment when
comparing SAS with SSD?

Best regards
Pedro




On Wed, Aug 1, 2012 at 4:35 PM, Kirk Peterson <kipeters at wsu.edu> wrote:
>
> Sorry, I should have been more specific.  Our setup for these iMacs only has
> 1 SATA and 1 SSD (they only have room for 2 drives).  So my improved
> performance is indeed with respect to a single SATA drive. Our clusters
> typically have 3-4 raid0 striped SATAs such as Millard describes.  Anyone do
> raid0 SSDs?
>
> -Kirk
>
> On Jul 31, 2012, at 9:54 PM, Millard H. Alexander wrote:
>
> i might disagree:   an SSD drive is indeed faster than a single SATA drive.
> However, if you put two SATA drives together with software raid0 (striped),
> then the combined drive beats the SSD.  (but Kirk might have a more
> up-to-date experience).  on our machines we typically link 4 SATA drives as
> raid 0 (striped but not mirrored) and have an additional SATA drive for
> backup.
>
> Begin forwarded message:
>
> From: Kirk Peterson <kipeters at wsu.edu>
> Subject: Re: [molpro-user] flash solid state drives
> Date: July 31, 2012 3:26:54 PM EDT
> To: harding <harding at anl.gov>
> Cc: "molpro-user at molpro.net" <molpro-user at molpro.net>
>
> Larry,
>
> We do this on some of our new iMacs and the improvement is very noticeable
> compared to just SATA drives.
>
> -Kirk
>
>
> On Jul 31, 2012, at 11:41 AM, harding wrote:
>
> Has anyone had experience putting molpro scratch files on a flash solid
> state drive?
>
>
>
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> ---
> millard alexander, distinguished university professor
> department of chemistry and biochemistry
>     institute for physical science and technology
> university of maryland, college park, maryland, 20742-2021, usa
> tel:  +1.301.785.4791
> website:   www2.chem.umd.edu/groups/alexander
>
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