Anyone running raid 0 ssds?

[crazzapple]

With the price of high end ssds (Samsung 850 pro 256 GB $170) rapidly dropping, I'm considering running two of these in a raid ) config. Anyone doing this? What kind of speeds should be expected?

Sounds like a real nice upgrade for $340US.

 

[Crosscreek]

With the price of high end ssds (Samsung 850 pro 256 GB $170) rapidly dropping, I'm considering running two of these in a raid ) config. Anyone doing this? What kind of speeds should be expected?

Sounds like a real nice upgrade for $340US.

I seen some people early this year doing it with 840 250GB Evos and they were getting over 1k read and writes in raid 0.

 

[cinealta]

Hopefully you'll see > 1 Tb/s or on par with PCIe-SSD.

 

[Mr. Retrofire]

I seen some people early this year doing it with 840 250GB Evos and they were getting over 1k read and writes in raid 0.

You mean probably 1000 MByte/s not 1 kByte/s.

Hopefully you'll see > 1 Tb/s or on par with PCIe-SSD.

One Terabit/s (Tb/s)
= 1000.000.000.000 bits/s
/ 8
= 125.000.000.000 Byte/s
/ 1000.000
= 125.000 MByte/s

Conclusion: You use a SSD from the future! ;-)

 

[Crosscreek]

You mean probably 1000 MByte/s not 1 kByte/s.


One Terabit/s (Tb/s)
= 1000.000.000.000 bits/s
/ 8
= 125.000.000.000 Byte/s
/ 1000.000
= 125.000 MByte/s

Conclusion: You use a SSD from the future! ;-)

yep

 

[scottsjack]

Please tell how to set up two internal SSDs as a RAID 0.

 

[cinealta]

Please tell how to set up two internal SSDs as a RAID 0.

See directions for creating a "striped" RAID set:

http://support.apple.com/kb/ph5834

 

[qcmacmini]

If you read most articles on this, it doesn't bring real world benefits, unless you need to edit/playback 4k video. Sequential benchmarks don't really help in usual daily tasks unless you copy big files.

I went with a single 1TB 850 PRO and my mac mini is insanely fast compared to the spinner, everything is just about instantaneous.

 

[scottsjack]

See directions for creating a "striped" RAID set:

http://support.apple.com/kb/ph5834

Thanks. No support for FileVault so I'm done.

 

[macaron95]

just bought a 2012 Mac Mini server this month

and running RAID 0 SSD on it

https://forums.macrumors.com/threads/1815391/

 

[cinealta]

You mean probably 1000 MByte/s not 1 kByte/s.


One Terabit/s (Tb/s)
= 1000.000.000.000 bits/s
/ 8
= 125.000.000.000 Byte/s
/ 1000.000
= 125.000 MByte/s

Conclusion: You use a SSD from the future! ;-)

LOL, yes you're right!

 

[crazzapple]

If you read most articles on this, it doesn't bring real world benefits, unless you need to edit/playback 4k video. Sequential benchmarks don't really help in usual daily tasks unless you copy big files.

I went with a single 1TB 850 PRO and my mac mini is insanely fast compared to the spinner, everything is just about instantaneous.

That is a good point. I guess it would also increase the chance of a failure since there are two instead of one, even if it's a small chance.

----------

just bought a 2012 Mac Mini server this month

and running RAID 0 SSD on it

https://forums.macrumors.com/threads/1815391/

Nice!

 

[qcmacmini]

That is a good point. I guess it would also increase the chance of a failure since there are two instead of one, even if it's a small chance.
Nice!

Yeah exactly, also your 4k random speeds will be identical, plus you're adding the extra point of failure.

I had the choice of two cheaper SSDs in RAID, or one top end SSD, and went for the latter.

 

[cinealta]

I had the choice of two cheaper SSDs in RAID, or one top end SSD, and went for the latter.

Two top end SSDs in RAID 0 would be even better.

 

[macaron95]

Two top end SSDs in RAID 0 would be even better.

it all depends if you choose performance or safety

 

[qcmacmini]

Two top end SSDs in RAID 0 would be even better.

I don't know, it makes more sense to buy a Macbook Pro 15" with 1TB x4 PCIe SSD. Two 1TB Samsung 850 PROs would cost stupid money for a mac mini build, and you're still left with HD4000 graphics.

 

[cinealta]

I don't know, it makes more sense to buy a Macbook Pro 15" with 1TB x4 PCIe SSD. Two 1TB Samsung 850 PROs would cost stupid money for a mac mini build, and you're still left with HD4000 graphics.

it all depends if you choose performance or safety

True. Good points.

 

[Mr. Retrofire]

it all depends if you choose performance or safety

He can use the Samsung Enterprise SSDs (for example the MZ7WD240HCFV):
http://www.samsung.com/global/business/semiconductor/file/media/SM843T_SV843.pdf

and
http://www.samsung.com/global/business/semiconductor/product/flash-ssd/catalogue?iaId=832
(select 1st "Interface", then "SATA 6.0Gbps", then "Sorting")

They are much more reliable than the 850 Pro.

 

[qcmacmini]

He can use the Samsung Enterprise SSDs (for example the MZ7WD240HCFV):
http://www.samsung.com/global/business/semiconductor/file/media/SM843T_SV843.pdf

and
http://www.samsung.com/global/business/semiconductor/product/flash-ssd/catalogue?iaId=832
(select 1st "Interface", then "SATA 6.0Gbps", then "Sorting")

They are much more reliable than the 850 Pro.

Samsung quote 2 million hours MTBF for the 850 Pro, and also for the enterprise SSDs you linked to.

Explain to me how the reliability is better with the enterprise models.

 

[Mr. Retrofire]

...Explain to me how the reliability is better with the enterprise models.

The 850 Pro can write up to 150 TB data to the flash memory:
http://www.samsung.com/global/busin...nt/Samsung_SSD_850_PRO_Data_Sheet_rev_1_0.pdf

The 240 GB MZ7WD240HCFV Enterprise SSD can write up to:
1.8 * 240 GB = 432 GByte each day for 5 years (see datasheet) data to the flash memory.

365 days * 5 years * 432 GB = 788400 GB ≈ 788 TBW*

The 1.8 Drive Writes Per Day are the minimum. Samsung lists also 5.4 and 11 Drive Writes Per Day (see datasheet)


*TBW:

From:
http://www.jedec.org/sites/default/files/Alvin_Cox [Compatibility Mode]_0.pdf

-----
Endurance rating (TBW rating)
– The number of terabytes that may be written
to the SSD while still meeting the
requirements.
-----

 

[qcmacmini]

The 850 Pro can write up to 150 TB data to the flash memory:
http://www.samsung.com/global/busin...nt/Samsung_SSD_850_PRO_Data_Sheet_rev_1_0.pdf

The 240 GB MZ7WD240HCFV Enterprise SSD can write up to:
1.8 * 240 GB = 432 GByte each day for 5 years (see datasheet) data to the flash memory.

365 days * 5 years * 432 GB = 788400 GB ≈ 788 TBW*

The 1.8 Drive Writes Per Day are the minimum. Samsung lists also 5.4 and 11 Drive Writes Per Day (see datasheet)


*TBW:

The endurance rating has nothing to do with reliability in a consumer sense. I highly doubt anyone here will write 788TB to their drive.

I'm not saying that drive doesn't have it's application in enterprise data centres, but saying that putting that in a Mac Mini in someone's house under the premise of improved reliability is misleading.

99.999% of home and business users will experience the same reliability between those drives and an 850 PRO.

 

[Mr. Retrofire]

The endurance rating has nothing to do with reliability....

Wrong.

----------

99.999% of home and business users will experience the same reliability between those drives and an 850 PRO.

Source?

----------

...saying that putting that in a Mac Mini in someone's house under the premise of improved reliability is misleading.

It is the truth and not misleading. Not everyone ignores the facts and is a single user @ home.

 

[qcmacmini]

Wrong.

----------


Source?

----------


It is the truth and not misleading. Not everyone ignores the facts and is a single user @ home.

Well, MTBF is the same on both.

You're implying that home users may write over 700TB.

I say this is highly unlikely.

Endurance is simply a wear out curve, and doesn't come into play.

My reasoning is that for a home user you would have long upgraded your machine before this comes into play.