alphaod
macrumors Core
RAID 0 is striping AKA add up all the storage.
So in answering your question a RAID 0 of two 256GB drives yield a total of 512GB of total space.
Macbook Pro RAID 0 Benchmarks & Discussion (SSD/HDD)
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RAID 0 is striping AKA add up all the storage.
So in answering your question a RAID 0 of two 256GB drives yield a total of 512GB of total space.
Total of 512GB. RAID0 stripes the data together. If it was RAID1, it would be a mirror of data and thus be a total of 256GB.
RAID0 basically takes your data and pieces it together into two chunks on two drives. Think of it like using two hands instead of just one (hence, it's usually roughly twice as fast).
johnnnw
macrumors 65816
I'm even more excited to do this soon now, I was kinda put off by spending 500 or so dollars on two good SSDs and only getting the storage of one, but I totally messed up. I knew how RAID 0 worked but wasn't thinking about it clearly I guess.
Thanks!
I use Time Capsule. Speed isn't an issue since I have PowerNap enabled and when I'm home, my laptop is plugged in. So it is always backed up when I leave in the morning.
Restore speeds aren't really important (to me) as I can just restore and go do something else. If I my drive took a crap and I needed to do work immediately, I have a bootable SD card with OS X ML that I can use then pull the files I need to work on off of the Time Capsule, do my work and restore the laptop later.
Wireless > Speed for backups, imo.
Cool!
It's a good idea to have a good backup solution. I'm currently using a Time Capsule. The nice thing about RAID0 is that it stripes data across two drives. The bad thing about RAID0 is that half your data is on one drive and half on the other! But it's not complete files, it's a chunk of each file! SO, if one drive fails, all data is lost and unrecoverable.
It's also much, much more difficult to retrieve files from a failed RAID0 drive than a drive that has failed NOT part of a striped RAID, and might still be readable.
MaxPower72
macrumors 6502
To tell you the truth, I don't know. I rarely shut it down. I can recall maybe a 4-5 second shut down, but I've no idea about boot up time.
There is a discussion on this in another thread here.
This is normal since OSX Version 10.8.2. Sometimes is shuts down normal within 2 seconds, and sometime it takes more than 10 seconds... I hope Apple fix it with 10.8.3.
l.a.rossmann
macrumors 65816
In my experience, with RAID 0, it doesn't help latency. Latency is what you really notice - clicking something and it appearing instantly, or waiting for one of those obsolete spinning POSes to find it.
RAID 0 helps read/write speeds in the long term, something most users won't notice. But it does increase likelihood for failure. A single SSD will slaughter two fast drives in RAID, with much better latency, and I feel like a single SSD is fast enough that it is not worth striping them to gain a little speed while doubling the risk of failure.
JMO. RAID away gentlemen!
RAID 0 helps read/write speeds in the long term, something most users won't notice. But it does increase likelihood for failure. A single SSD will slaughter two fast drives in RAID, with much better latency, and I feel like a single SSD is fast enough that it is not worth striping them to gain a little speed while doubling the risk of failure.
JMO. RAID away gentlemen!
If you're talking about when you close the lid to put it into standby... it's because safe sleep is enabled by default, you can turn it off in the terminal.
johnnnw
macrumors 65816
I kind of agree, sort of. As long as you're doing backups RAID is amazing. Maybe at some point it gets ridiculous, but copying files 50GB's in size in a flash doesn't get old ever.
No, i really mean to shutdown. No standby or sleep...
Scorpio Blue 1TB,
external USB3.0 raid0, bus powered.
Hell. Yeah.
On top of that, it's less noisy than a single WD Passport Studio 500GB.
thank you CineRaid for making a totally awesome enclosure.
http://www.cineraid.com/products/home_h212.htm
external USB3.0 raid0, bus powered.
Hell. Yeah.
On top of that, it's less noisy than a single WD Passport Studio 500GB.
thank you CineRaid for making a totally awesome enclosure.
http://www.cineraid.com/products/home_h212.htm
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Funkmaster Flix
macrumors newbie
I have been following this thread for some time now and i am wondering how it is possible to run a SATA3 SSD in the optical drive bay.
From what i've heard SATA3 drives usually don't get recognized at this connector. Only time i have read about a SSD RAID configuration in a MBP is was an older version of the 13" MBP.
Where's the trick?
From what i've heard SATA3 drives usually don't get recognized at this connector. Only time i have read about a SSD RAID configuration in a MBP is was an older version of the 13" MBP.
Where's the trick?
Raid 840 pro
Hi I have exactly the same problem with two Samsung 840 Pro. Have you find any solution, or you just change again for the Samsung 830?
Thank you
Hi I have exactly the same problem with two Samsung 840 Pro. Have you find any solution, or you just change again for the Samsung 830?
Thank you
840 pro
I changed back to 830. A few weeks later I got another 840er pro in my hands and checked it on the Optibay port. It worked! I ordered the second 840 and now it works fine. I thougth it was because of the firmware, but I'm not sure about that...
I changed back to 830. A few weeks later I got another 840er pro in my hands and checked it on the Optibay port. It worked! I ordered the second 840 and now it works fine. I thougth it was because of the firmware, but I'm not sure about that...
hajduk78
macrumors newbie
Slow RAID 0 on MacBook Pro 13" 9,2
Hi all.
I would need some help for the configuration of my new MacBook Pro RAID 0 setup.
Recently I bought the non retina MacBook Pro 13" with i7 2.9 Ghz, 750GB HDD and 8GB RAM. I purchased a data doubler from eBay, not the OWC one, just a common Chinese product for the DVD Superdrive tray. Then I' got two Samsungs SSD 840 PROs 512 GB to put in RAID 0. I did the RAID 0 setup and a clean MAC OSX install through the 750 HDD that I took out, and what I get on Blackmagic speed is something ridiculous slow like 130 MB/s in write, and 350 MB/s in read speed.
I haven't tried enabling TRIM, I tried to update the SSDs firmware, but the MacBook Pro was giving me some weird message that there is no bootable disk on the system. I was booting from the CD, so I don't know what could be wrong in that? I tried the same CD in my older MacBook Pro mid 2009, and the CD worked fine.
Maybe I did something wrong?
Can you give me a few suggestions how to improve the speed? It should be over 900 MB/s in both read and write...
Hi all.
I would need some help for the configuration of my new MacBook Pro RAID 0 setup.
Recently I bought the non retina MacBook Pro 13" with i7 2.9 Ghz, 750GB HDD and 8GB RAM. I purchased a data doubler from eBay, not the OWC one, just a common Chinese product for the DVD Superdrive tray. Then I' got two Samsungs SSD 840 PROs 512 GB to put in RAID 0. I did the RAID 0 setup and a clean MAC OSX install through the 750 HDD that I took out, and what I get on Blackmagic speed is something ridiculous slow like 130 MB/s in write, and 350 MB/s in read speed.
I haven't tried enabling TRIM, I tried to update the SSDs firmware, but the MacBook Pro was giving me some weird message that there is no bootable disk on the system. I was booting from the CD, so I don't know what could be wrong in that? I tried the same CD in my older MacBook Pro mid 2009, and the CD worked fine.
Maybe I did something wrong?
Can you give me a few suggestions how to improve the speed? It should be over 900 MB/s in both read and write...
Funkmaster Flix
macrumors newbie
Hi all.
I would need some help for the configuration of my new MacBook Pro RAID 0 setup.
Recently I bought the non retina MacBook Pro 13" with i7 2.9 Ghz, 750GB HDD and 8GB RAM. I purchased a data doubler from eBay, not the OWC one, just a common Chinese product for the DVD Superdrive tray. Then I' got two Samsungs SSD 840 PROs 512 GB to put in RAID 0. I did the RAID 0 setup and a clean MAC OSX install through the 750 HDD that I took out, and what I get on Blackmagic speed is something ridiculous slow like 130 MB/s in write, and 350 MB/s in read speed.
I haven't tried enabling TRIM, I tried to update the SSDs firmware, but the MacBook Pro was giving me some weird message that there is no bootable disk on the system. I was booting from the CD, so I don't know what could be wrong in that? I tried the same CD in my older MacBook Pro mid 2009, and the CD worked fine.
Maybe I did something wrong?
Can you give me a few suggestions how to improve the speed? It should be over 900 MB/s in both read and write...
Give it some time. Maybe your MacBook was still initializing. It had the same issue, but when i tried the next day it was amazingly fast, much faster than the day before.
hajduk78
macrumors newbie
I hope so...
Thanks, man.
You gave me a hope. I urgently needed to leave country for a couple of weeks, so I've never had a chance to test it afterwards. I was reading that it could be a problem with the SSD's firmware (old one), or TRIM not enabled, or even EFI firmware update from Apple, so I was really confused. Once I return home, I'll test it and see.
Thanks again, I'll keep the fingers crossed.
Thanks, man.
You gave me a hope. I urgently needed to leave country for a couple of weeks, so I've never had a chance to test it afterwards. I was reading that it could be a problem with the SSD's firmware (old one), or TRIM not enabled, or even EFI firmware update from Apple, so I was really confused. Once I return home, I'll test it and see.
Thanks again, I'll keep the fingers crossed.
johnnnw
macrumors 65816
hajduk78
macrumors newbie
I got it brand new a couple of weeks ago from dixons travel duty free, but the model must be from last year (The www.everymac.com says is mid 2012), as it seems Apple is going to stop producing it, and focus only on retina model.
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johnnnw
macrumors 65816
Okay just making sure it wasn't an older model and sata 2 or something. Knew it was a longshot because they switched to sata 3 in the 2011 models. Last ones to have sata 2 was 2010 models.
I have the exact one and running a 840 Pro at 480 write/520 read so I have no idea what could cause your problem besides one is faulty and causing slow speeds.
Have you tried un-raiding them and doing a speed test on each one separate?
Thats what I would do.
hajduk78
macrumors newbie
I will definitely try all the suggestions, until I get a reasonable explanation. First, I'm going to update firmwares on both of them, then I'm going to enable TRIM, then I'm going to leave them for a couple of days and try to work like that, and if I still get slow readings, I'll try to unraid them, restore MAC OSX on each one of them and test them individually. I need to come up with something. I just hope it is something wrong with the software.
Thanks for your advices!
hajduk78
macrumors newbie
Hi.I will definitely try all the suggestions, until I get a reasonable explanation. First, I'm going to update firmwares on both of them, then I'm going to enable TRIM, then I'm going to leave them for a couple of days and try to work like that, and if I still get slow readings, I'll try to unraid them, restore MAC OSX on each one of them and test them individually. I need to come up with something. I just hope it is something wrong with the software.
Thanks for your advices!
That's me back home and restarting the RAID 0 performance checks. I managed to upgrade to the latest firmware today, and I installed TRIM and enabled it. The situation now is a little better, but just a little. Write speeds are around 240 MB/s, and read around 550 MB/s. I am wondering now if it the block size counts. I didn't change it, and by default was selected on 32 kB. Is that too small? Can it be the reason why I get low write speeds?
Please, any suggestions would be great appreciated. I don't want to strip the SSDs one by one, and test them individually by reinstalling the OS back on from beginning.