RAID 0 separated

graham3d3d · Jun 27, 2018

I have 3x250gb ssds in RAID 0 as my c:/ drive.
One of them came unplugged and i have plugged it back in.
Now it wont boot because it sees them as 3 separate disks.
Any ideas how to tell the computer to see these 3 disks as a RAID 0 array?
using windows 10.
Asus Bios. Marvel Raid controller

androbourne · Jun 27, 2018

I'm not familiar with Marvel Raid controllers but like any raid controllers. There should be Raid software you can install to configure the raid. If you can't find the software, then you may need to boot into the raid controller and configure it directly from the raid controller it's self.

https://www.youtube.com/watch?v=3jM4tDfAHaE (but instead of creating, add additional)

My real question is why do you have 3 SSDs in a Raid 0 just for your OS? I highly doubt 3x SSDs in a stripped raid is going to have any better performance then 1 good SSD. The limitation is the Sata bottleneck. Only way to get around that would be to use M.2 SSDs etc...

Sounds like over kill unless you are doing some crazy amount of video processing or something but even then, you'd still most likely hit that Sata bottleneck.

faalin · Jun 27, 2018

Have you tried to boot into the Marvell Raid controller during boot up to try and re initialize the disc in raid again?

iamacow · Jun 27, 2018

That is a really strange setup to have SSD raided, let alone 3 of them. You probably needs to go into the raid controller during boot and reconfigure it for all the drives to act as one again. Most raids when it comes "broken", it is disabled until reset in the controller to avoid data corruption or loss.

Edit: In fact 1 SSD is faster in many real world usage because the overhead it a lot lower. Yeah you will see a higher read/write speed with 3 drives but when in put in practices for apps, it actually preforms worse in many cases from the high overhead. Thats when real Raid cards come into play that have a dedicated raid controller to handle the I/Os, but your onboard raid is run by software and isn't any better than a single drive.

graham3d3d · Jun 28, 2018

androbourne :

I'm not familiar with Marvel Raid controllers but like any raid controllers. There should be Raid software you can install to configure the raid. If you can't find the software, then you may need to boot into the raid controller and configure it directly from the raid controller it's self.

https://www.youtube.com/watch?v=3jM4tDfAHaE (but instead of creating, add additional)

My real question is why do you have 3 SSDs in a Raid 0 just for your OS? I highly doubt 3x SSDs in a stripped raid is going to have any better performance then 1 good SSD. The limitation is the Sata bottleneck. Only way to get around that would be to use M.2 SSDs etc...

Sounds like over kill unless you are doing some crazy amount of video processing or something but even then, you'd still most likely hit that Sata bottleneck.

graham3d3d · Jun 28, 2018

Thanks, I'll try to get to the raid controller. Ove just had a thought that the problem could be that I am using a Pci RAID card which possibly has it's own controller. its been a while since i installed it and now i cannot remember. - I think it was a plug and play card.
Im dont think i get the sata bottle neck because its on the pci card. I seem to remember I was getting in out speeds of just under 3 times the usual 6gbs. Incredible.
and yes I do video and 3d rendering.

androbourne · Jun 29, 2018

Yes if it is a card it's self and you are not using on board mobo. Then you should get better speed for sure.

graham3d3d · Jun 29, 2018

ok. the raid pci card is just 4 6gbs sata ports. So the RAID is being done by Windows Conputer Manager.
in the end I have restored the system form the EaseUS ToDO Backup onto a spare 1gb drive. (It feels soooo slow to what Im used to).
So im booting up on that for now. Ive given up on trying to flick a switch to set them back to raid. - I thought I might be able to do it by spanning the drives or something.
So i have deleted the 3 drives and spanned them to make one
I think that's RAID 0, but windows calls it something else.
Now i can restore the EaseUS backup to the 3 ssds.
I am concerned tbat a lot of the settings might be lost from the registry, but it's not as bad as it might have been.
Ive been advised to go for RAID 10 (1+0) which would obviously need more disks and a larger pci card.

androbourne · Jun 29, 2018

Never do a software raid from Windows if you have a raid card with a controller!

Redo your raid from the raid controller directly!!

And yes Raid 10 will give you redundancy and speed however a Raid 0 is typically still faster. If you only care about speed and not data loss then stick with Raid 0. Also Raid 10 you need at least 4 disks.

USAFRet · Jun 29, 2018

SSD + RAID 0:
http://www.tomshardware.com/reviews/ssd-raid-benchmark,3485.html

Great for benchmarks.
Not so much for actual real world use.

androbourne · Jun 29, 2018

USAFRet :

That just refers to 2x SSDs in a Raid. Every disk you add to that raid will increase the performance. Just fyi.

But as I stated earlier. I don't think a Raid with SSDs is going to change performance for his needs enough to warrant it. But wont know until his tries it.

USAFRet · Jun 29, 2018

androbourne :

Right. That tests 2x drives. Add more drives, and the benchmarks reach Uber speed.
And increase the fail potential.

For what real user facing gain?
I've yet to see any independent tests where it is an actual "benefit".

Large numbers in synthetic tests? Sure.
But show me something that actually changes the user experience.

androbourne · Jun 29, 2018

USAFRet :

I deal with raids in real world all the time as a network\system administrator... for things like what is doing (aka video editing) and heavy applications. It does indeed make a difference as long as he isn't be bottlenecked by the Sata port it's self.

Like I said. For his exact needs he wont know until he performs testing with his application before and after the Raid creation. The way application process on the disk also effect this aspect in a Raid.

If you need proof of this for some odd reason. Just google crystal disk reports and there is many forum posts doing raid comparisons tests and talking about how raiding on SSDs increased performance for several users with specific applications.

USAFRet · Jun 29, 2018

I deal with RAID of various use cases at work as well.

The vast majority of people here with a RAID 0 SSD array think it is a good idea (based on what happened with HDD's), but gives no real performance benefit with SSD's.

And unplugging a drive and reconnecting should not be an issue.
But if it does become an issue and the RAID is then broken, as happens sometimes...recover from last nights backup.

androbourne · Jun 29, 2018

USAFRet :

For the most part I would agree. Read my first comment asking why he wanted to go with Raid 0 in the first place. I think it might be overkill for his needs.

However, I have seen it increase performance in specific applications. So its possible it may help him. Wont know until you try it.

USAFRet · Jun 29, 2018

androbourne :

USAFRet :

For the most part I would agree. Read my first comment asking why he wanted to go with Raid 0 in the first place. I think it might be overkill for his needs.

However, I have seen it increase performance in specific applications. So its possible it may help him. Wont know until you try it.

Agreed.

iamacow · Jul 7, 2018

A PCIE AIC will be faster than any RAID SATA SSD. Cheaper and won't need raid drivers or controllers. Intel 750 800GB is cheap on ebay used. I snagged a 1.2TB for $450 last week. 400GB $150 last month.

androbourne · Jul 9, 2018

iamacow :

Eh yeah... but he already has the raid controller so we are going based on what the OP already has...

RAID 0 separated

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