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pros/cons of raid 1

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  #1  
Old 10-19-2005, 11:02 AM
crazyfish crazyfish is offline
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pros/cons of raid 1


I was just wondering what the pros/cons of using a software raid 1 setup or using a hardware raid 1 setup? Are there any big issues with either of them?



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  #2  
Old 10-19-2005, 12:18 PM
Apolo Apolo is offline
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Do you mean comparing Software RAID to Hardware RAID?

Of course you'll get less performance issues by using (quality) hardware RAID setup.

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  #3  
Old 10-19-2005, 12:39 PM
crazyfish crazyfish is offline
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Yes comparing the two.

Are performance issues common with software raid?

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  #4  
Old 10-19-2005, 12:59 PM
Blapto Blapto is offline
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Yes, as the work is done by the processor instead of dedicated controller chip.
You also won't get features like hot-swap and hot-spare with software.

  #5  
Old 10-19-2005, 01:09 PM
eth00 eth00 is offline
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Con of hardware - Cost

other then that hardware is best

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  #6  
Old 10-19-2005, 01:58 PM
dkitchen dkitchen is offline
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I would disagree with hardware being best, from my experience, I've seen many hardware cards crap out and screw up entire arrays, where data could not be recovered - NEVER seen that once with software.

And IMO the performance difference is negligible with RAID1.

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  #7  
Old 10-19-2005, 02:50 PM
atchoooo atchoooo is offline
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Razorblue is right .. same experiences here .. adding a RAID card is raising the chances of hardware problems. You need to think about the pros and the cons in your specific situation and the pros and the cons are not limited to cost.

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  #8  
Old 10-19-2005, 03:28 PM
crazyfish crazyfish is offline
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That is what I am looking for the pros/cons of both setups. I'm not really worried about the costs, to me thats not a con if it is a better setup. I am trying to figure out what method would be better for disk mirroring.

  #9  
Old 10-19-2005, 03:38 PM
atchoooo atchoooo is offline
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1- What hardware will you use and what will you use the server for?
2- Will you use IDE or SCSI hard disks?
3- Will there be a LOT of disk activity?
4- Is a 15 minute downtime to change a hard disk critical in your situation?

I would say that the pros and cons depend of your particular situation. I would say software for raid-1 solutions, hardware raid for raid-5 scsi or other advanced solutions. Personnal opinion based on my personnal experience.

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  #10  
Old 10-19-2005, 03:42 PM
crazyfish crazyfish is offline
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1) dual xeon, 2 GB ram, it will be a web/mysql server
2) IDE drives
3) most likely, it will be the only server I have
4) 15 minutes downtime is fine, more then that might start to have issues with that.

Thanks for your opinion.

  #11  
Old 10-19-2005, 03:49 PM
atchoooo atchoooo is offline
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I would choose software raid-1 ... the performance lost of software raid should not affect you, the cost is cheaper and you will avoid possible hardware raid adapter problems. Make sure that someone is available quickly to swap the drives if a drive fails. Also, do not forget to have an external backup because you cannot rely on your raid drive to be your only backup, if a data corruption occurs on your first drive there are chances that data will also be corrupted on the mirror drive.

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  #12  
Old 10-19-2005, 04:30 PM
KarlZimmer KarlZimmer is offline
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What hardware RAID cards are people using that they're having problems with? We've been using a good numbers of 3ware cards for well over a year now and we have yet to see any issue with them.

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  #13  
Old 10-19-2005, 04:37 PM
Coolraul Coolraul is online now
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I agree plus with most you can backup the raid config offline which means IF the card dies you can put a replacement in and have the raid config back.

In terms of hardware raid actually mangling the drives/contents no thats been very rare maybe happened once on an old DEC server where we put the wrong driver on and thats in about 16 years of working with hardware raid.

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  #14  
Old 10-20-2005, 05:16 AM
KDAWebServices KDAWebServices is offline
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Quote:
Originally posted by KarlZimmer
What hardware RAID cards are people using that they're having problems with? We've been using a good numbers of 3ware cards for well over a year now and we have yet to see any issue with them.
I was just thinking the same, we've been using RAID for coming up to 5 years now in our servers and certainly aren't seeing the issues many are pointing out. With the 3Ware cards, they store the RAID config on the drives, so if the card dies, you just put another one in and away you go.

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  #15  
Old 10-20-2005, 05:31 AM
robinbalen robinbalen is offline
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I was just thinking the same, we've been using RAID for coming up to 5 years now in our servers and certainly aren't seeing the issues many are pointing out. With the 3Ware cards, they store the RAID config on the drives, so if the card dies, you just put another one in and away you go.

Ditto.

It's also very handy if another component fails in a server. Just swap out all the hard disks to your spare chassis, and the 3ware controller in that chassis picks up all of the array data off the hard disks.

If you're worried about extra redundancy or performance, look at using RAID5 or RAID10 instead.

Performance (particularly write, compared to the 9500) on the new 9550SX cards is pretty amazing as well.

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