Anyone with 4 x Samsung 840 PRO's on RAID5 with LSI Card?

[HellChords]

Hi,

And concerning 840 non-pro (250gb and 500gb versions) ? The problem was solved too ? (Not indicated in the PDF http://www.lsi.com/downloads/public.../megaraid_value_feature_interop_list_sas2.pdf, maybe forgot ?)

Thanks,
HellChords.

 

[mrkrad]

dude come on, using a TLC drive on a server? That is just not sane.

 

[Patrick]

dude come on, using a TLC drive on a server? That is just not sane.

Totally sane if you have a read-only data set. Lots of data, that you need to access randomly but do not need to change.

 

[HellChords]

It appears that endurance is honorable :

Hardware.Info tests lifespan of Samsung SSD 840 250GB TLC SSD [Updated with final conclusion] - Final update (20-6-2013) | Hardware.Info United States
(Estimate 23 years before fisrt re-allocated sector with write 30 GiB/day.)

I'll not write 10gb by day. I'll put 10-15 VMs on RAID 1 (Hypervisor VMware) with web service or AD, but not big database.

 

[mrkrad]

Well I guess you can also factor in that modern sad controllers can use TLC/MLC/SLC in various modes.

Imagine if you programmed TLC to act like SLC so you have 000,001,010,100... but what if you programmed it as mlc with parity? or slc with 1 usable bit

in mlc mode, you could do 00,01,10,11 and use the extra bit as parity (0,1) or ecc.

in slc mode you could do 0,1 (000,111) or 2 bits ecc.

or all 3 modes at the same time, perhaps you have some SLC mode, some mlc mode, and some TLC mode.

Likewise mlc is used in SLC mode on vector when 50% OP is used.

I'd guess that programming TLC in slc or mlc like modes could also increase speed (vesus extra protection).

What i'd love to see is a mixture of SLC,MLC, and TLC all working together as configurable for speed, density or reliability.

That would be pretty cool if you end users could configure the controller to optimize for the workload!