Flash drives which use SATA protocol internally is supported on CLARiiON, starting with FLARE Release 30. From an end-user point of view, they can be used in exactly the same way as the flash drives which were released earlier.
Specifically the 100GB EFD is SATA and the 200GB is available as FC or SATA. They are treated the same by the array regardless of protocol. The 100GB SATA EFD is less expensive than the 73GB FC EFD last time I checked.
Senior Technology Consultant, EMC, TME
Hi i have now get some EFD drives, and yes there are SATA SSD drives for Clariion Flare 30 systems
The EFD drives i got is
EMC Part No: 005048998 Stec Zeus Iops SSD Model Z16IFE3B-200 / 520UC - EMC whitch is a 200Gb FC drive whit
READ & WRITE PERFORMANCE
IOPS READ & WRITE PERFORMANCE
Read: Up to 80,000
And then the
SATA EFD (EMC Part No 005049076) Samsung Model: MZ-3S92000/0C3
Samsung Part No MZ3S9200XACP–000C3
200GB SSD 520BPS 3Gb SATA II -R (Chariot)
But i cannot find any performance information on the Samsung SATA EFD ohter than it is 3Gb as the other normal SATA drives, this should be the limititation in the SATA protocol and the imposer board there is on these SATA drives (P/N 250-135-903D) = converter between SATA and FC protocol.
These SATA EFD drives has been sold as the FAST CACHE drive pacage to the NS960 Item # FLNSAF04-200 200GB FLASH DRIVE FOR NS FAST CACHE NEW INS.
So now to my question 🙂
Is these SATA EFD drives good for use as FAST CACHE, i think the FC EFD are faster, and when the use of FAST CACHE is in so close connection to the very fast normal cache (DRAM), why are these SATA 3GB dives sold as FAST CACHE ? Yes i persume they are cheaper, but in performance manner the FC should be better for this purpose right.
And is it a good idea to seperate these 3Gb SATA EFD's whit the normal SATA drives, as the 3Gb interface on the drive will slow down a 4GB FC backend loop ?
As always in good latin to seperate SATA drives from FC drives, on the BE busses.
I have 42 FC EFD there vas ment for FAST Tiering, but i can use 20 of these FC EFD drives for FAST CACHE instad of the SATA EFD ment for FAST CACHE in the ordre, isent this better whit performance googles on ?
and then put these SATA EFD on BE busses whit my ohter Normal SATA drives, as all of them will bring down the BE to 3Gb
Regards Kenneth Hansen
Is these SATA EFD drives good for use as FAST CACHE?
Absolutely. In many respects, these new SSD drives are even better suited for the purpose than the previous version of EFD drives.
And is it a good idea to separate these 3Gb SATA EFD's whit the normal SATA drives?
SSD drives CANNOT be mixed in a DEA with SATA drives. and that goes for the old as well as for the new types.
A DAE containing SATA2 spinning drives can contain SATA2 spinning drives only
A DAE containing SSD drives can contain FC drives as well.
A DAE containing FC drives can contain SSD drives as well.
The new generation SSD drive connects to the backend loop via an FC connection @ 4Gbs. (as does the existing SATA 2 drive) so the loop wil be running at full speed, 4Gbs, no matter what drive you connect.
The thing you want to take into consideration, if anything at al, is to separate sequential / large block workloads from random / small block workloads on each back end BUS.
Remember, a SSD drive actually is not a disk drive, but rather a small computer. Thus a lot of the stuff that you learned in the past about storage devices simply does not fit these drives.
I happen to know that you have a pretty smart EMC presaels guy assosiated to your account, so why dont you arrange a meating with him, and get things sorted out?
Lars B Andersen
Hi Lars Thanks for you respons to this tread.
There are thing i want to dig deeper into, so yes a meeting was my tought anyway 🙂
But why is the SATA EFD's marked as 3Gb if they connect to the the bus in 4Gb, yes internaly they maybee only work in 3Gb, but will this not give waitstates on the back-end loop, if they are mixed whit 4Gb FC drives EFD or Spindels.
I have been told by an EMC instructor on a course, that those imposer cards really only work in 3Gb, and can be a bottlenek, becourse of the protocol translation.
I absolutely know i have a pretty good presales guy 🙂 but sometimes it's good to have a second opinion !
So anyone ?
Thanks Kelleg this tread is really good, i learned something thanks
But i still thinks it's strange EMC marked the SATA drives (EFD or spindle) as 3Gb speed, this confuses people