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  Post #16 (permalink)   02-04-2016, 01:41 PM
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Quote:
Originally Posted by Andrius View Post
It is better to use software RAID than a hardware RAID with a cheap RAID controller.

Good RAID controller with cache memory and BBU is a good option.
Since everyone else seems to agree that hardware RAID is the better option, would you share with us why you believe software RAID is the better option for you?
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  Post #17 (permalink)   02-05-2016, 03:20 AM
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Quote:
Originally Posted by Andrius View Post
It is better to use software RAID than a hardware RAID with a cheap RAID controller.

Good RAID controller with cache memory and BBU is a good option.
This is true where you are dealing with low end hardware RAID.

High end Hardware RAID is opted for largely because it posses a power-loss protected DRAM cache. This DRAM cache offers very low latency for random write access in the form of sequential writing.

Now this is the component that lowend Hardware RAID controllers are weak at. Some low-end RAID controllers do not have a cache and also sometimes disable the DRAM cache making them much slower.
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  Post #18 (permalink)   02-16-2016, 07:19 AM
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Hello,

Even considering that, to me HW raid will always wins against SW raid because SW raid eats system ressources to write data where HW raid handles it.
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  Post #19 (permalink)   02-17-2016, 12:27 AM
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Quote:
Originally Posted by PeteCCS View Post
Hello,

Even considering that, to me HW raid will always wins against SW raid because SW raid eats system ressources to write data where HW raid handles it.
Well, sometimes no. Sometimes software RAID providers more reliability and better I/O than RAID with cheap RAID controller.

Also I remember situation, when integrated LSI RAID controller dropped SSD hard drives from array. The issue was solved when started to use SW RAID.
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  Post #20 (permalink)   02-17-2016, 03:42 AM
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Quote:
Originally Posted by Andrius View Post
Well, sometimes no. Sometimes software RAID providers more reliability and better I/O than RAID with cheap RAID controller.
Well, sometimes you have to put some dollars on the table if you want something efficient nothing new here. So if you prefer save some money yes go for SW raid.

Quote:
Originally Posted by Andrius View Post
Also I remember situation, when integrated LSI RAID controller dropped SSD hard drives from array. The issue was solved when started to use SW RAID.
Concerning SSD drives yes I agree it needs more care than sata drives in a HW raid.
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  Post #21 (permalink)   02-18-2016, 10:12 PM
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Hardware RAID is much more reliable for large drives. Don't rely upon software RAID for important data. Why risk it?
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  Post #22 (permalink)   02-22-2016, 05:57 PM
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I would buy a good hardware Raid card use hardware RAID. If you have good components, nothings beats that. I would not recommend using cheap RAID hardware because it will fail when you do not expect.
 
 
 


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  Post #23 (permalink)   02-28-2016, 03:41 AM
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We are using Software Raid on our few servers. Software raid is working fine. We didn't face any performance issue on Software RAID yet.
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  Post #24 (permalink)   02-28-2016, 10:33 AM
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This is a good question. Don't write off software RAID so fast. With today's CPUs software raid can out perform hardware raid. And hardware RAID can be a liabilty. For example, suppose your RAID controller goes out and the RAID data is stored on the card. You will need to find the exact same card to bring the system back up. This could mean searching ebay for a couple days. With software RAID you can move the drives to another box

So with software raid you can save a lot of money, recover faster and avoid vendor lock-ins

Unlike with hardware raid you can mix disk sizes and types (ide, sata, scsi)

SSD drives run faster on software RAID - the good RAID cards will disable a drives private cache that is needed by SSD drives. (Disabling a drive's private cache will cause data loss if there is a power failure)

Perhaps a mix of the two is best. Use hardware for / or c:/ and software raid for the bulk storage

Last edited by Collabora : 02-28-2016 at 10:56 AM.
 
 


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  Post #25 (permalink)   02-29-2016, 09:57 AM
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Quote:
Originally Posted by Tuxxin View Post
I ran a server with software raid 5. The motherboard went out and I wasn't able to recover data.
Technically, in your case, that is not software raid since raid is being managed by your bios. Its like a cheap raid card. Some people call it FakeRAID. Even if you were using true hardware raid and the raid card went down and you could not find an exact replacement you would be in the same position

With software raid, raid is managed by the OS and is hardware independent. Thus if your motherboard goes down you just need to replace the motherboard or move the disks to a new box. Software RAID is built into the Windows OS (Windows Server). For Linux you can download and install mdadm.
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Last edited by Collabora : 02-29-2016 at 10:21 AM.
 
 
 


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  Post #26 (permalink)   03-01-2016, 05:40 AM
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I just want to add that I have had no problems with software raid1. I have read horror stories about data loss due to hardware raid controllers going bad. With software raid its very simple to replace a failing drive. I have never experienced any data loss when software raid was used. Of course my experience is limited.
 
 
 


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  Post #27 (permalink)   03-01-2016, 07:12 AM
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HW raid is another point of failure. If you don't monitor hardware raid status proactively, then you may face sudden hardware failure issue. With Software raid you can monitor your raid status easily, where hw raid monitoring setup is not easy.
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  Post #28 (permalink)   03-01-2016, 07:43 AM
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There are some advantages of software raid over to hardware raid in terms of special hardware and cost. But hardware raid is more reliable than software raid as it do not uses the server resources.
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  Post #29 (permalink)   03-01-2016, 09:08 AM
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Quote:
Originally Posted by ExonHost View Post
HW raid is another point of failure. If you don't monitor hardware raid status proactively, then you may face sudden hardware failure issue. With Software raid you can monitor your raid status easily, where hw raid monitoring setup is not easy.
Yes that's the way I felt. mdadm will email me if a drive is kicked out of the array.

I personally think that if you need that extra little bit of performance from a hardware raid then you are probably close to overloading the server anyway.

I think there are pros and cons to each and each person needs to decide for themselves which one they want.
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  Post #30 (permalink)   04-20-2016, 07:48 AM
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My vote is for hardware raid.
 
 
 
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