http://confocal-microscopy-list.275.s1.nabble.com/SSD-RAID-for-new-wide-field-microscopy-system-tp7589536p7589549.html
NVME SSDs don't typically use a RAID controller, they're just PCIe devices, so you just plug them in and let the OS (or Intel's PCIe chipset if you use RST) handle RAID.
Those 860 EVOs are SATA devices, so the 970s would be a better choice from Samsung. Beware these are TLC disk and will slow down considerably (~1TB/s) as you write more and more, but this is usually ok unless you require very high sustained performance. There are also much cheaper and only marginally slower options you could use as well:
I've missed the moment they grew to usable size (2 TB only, though). And
RAID controllers are quite affordable, too. So a decent 8 TB fast storage
(4 x 860 EVO 2TB, PCIe x16 controller) would come at $1800. Would handle
> *****
> To join, leave or search the confocal microscopy listserv, go to:
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> *****
>
> Hi Zdenek,
>
> SATA SSDs have been obsolete for a while now. PCIe 3.0 NVME devices
> have a bidirectional 4GB/s transfer rate. For smaller acquisitions,
> any cheap device will be protocol limited (> 3GB/s), but only for the
> first 50-100GB, and they'll drop down to about 1GB/s as the disk fills
> up. More expensive devices can sustain closer to 2GB/s over the
> entire space. Very expensive devices will sustain 3GB/s, but there is
> no point with RAID. Just buy another disk and you get more capacity
> and the same bandwidth for less.
>
> By the way, now that SSD storage is hitting $100/TB, and PCIe 4.0
> devices are about to launch, affordable devices with 6-7 GB/s
> bandwidth in a single drive shouldn't be too far away. I think pretty
> soon there will be little point in RAID; parallelism will be internal
> to the "disk".
>
> Mike
>
> On Thu, May 23, 2019 at 10:52 AM Zdenek Svindrych <
[hidden email]<mailto:
[hidden email]>>
> wrote:
> >
> > *****
> > To join, leave or search the confocal microscopy listserv, go to:
> >
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> > *****
> >
> > Hi Mike,
> > where did you get the numbers? Regular SSDs I've seen are around 500
> MB/s,
> > both read and write. And SATA III speed is around 600 MB/s!
> > That's not quite enough even for a single 10-tap CameraLink camera (800
> > MB/s).
> > SSD RAID may seem an overkill, but you don't want to sacrifice speed just
> > because of poor PS specs... Of course RAID 0 array of regular hard drives
> > should work too, but the probability of data loss (due to failure of one
> of
> > the disks) rises with number of disks.
> > Best, zdenek
> >
> > On Thu, May 23, 2019 at 10:14 AM Michael Giacomelli <
> >
[hidden email]<mailto:
[hidden email]>> wrote:
> >
> > > *****
> > > To join, leave or search the confocal microscopy listserv, go to:
> > >
>
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> > > *****
> > >
> > > How fast are you acquiring data?
> > >
> > > Entry level SSDs are about $120/TB (~1GB/s write) while high
> > > performance SSDs are $250/TB (~2.5 GB/s write). Since SSDs are very
> > > inexpensive, that $6000 is probably getting you more than just a
> > > couple hundred dollars worth of disks?
> > >
> > > Mike
> > >
> > > On Thu, May 23, 2019 at 9:49 AM Mirco Martino <
[hidden email]<mailto:
[hidden email]>>
> wrote:
> > > >
> > > > *****
> > > > To join, leave or search the confocal microscopy listserv, go to:
> > > >
> > >
>
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> > >
>
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> > > > *****
> > > >
> > > > Hi all,
> > > >
> > > > we are buying a new fluorescent microscope wide-field system. The
> system
> > > include a workstation with 64GB DDR4 RAM, 11GB of graphic card, 512 gb
> of
> > > memory and SSD-RAID of 2TB. There is an option to increase the
> SSD-RAID to
> > > 4TB for about 6000$ extra. The system will be use for both fixed
> materiel
> > > imaging and for live-imaging with time-laps, z-stack, tiling and
> > > multi-fluorophores experiments. I was wondering if it is worth to
> invest
> > > those extra money for this option or not. This will be the first time
> we
> > > will have time-laps experiments, so I don't know what to expect as
> pictures
> > > size.
> > > >
> > > > What do you think?
> > > >
> > > > Thanks in advance for your comments and opinions!
> > >
> >
> >
> > --
> > --
> > Zdenek Svindrych, Ph.D.
> > Research Associate - Imaging Specialist
> > Department of Biochemistry and Cell Biology
> > Geisel School of Medicine at Dartmouth
>