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Raid 5 card that maximizes performance to 4 or 5 Gigabytes throughput?

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May 25, 2011 10:45:39 PM

Hello,

I am trying to build a small cluster. I'm planning on using Infinibands QDR which has 5Gigabytes of throughput. The PCI-Express 2.0 standard maxes out at 4Gigabytes throughput for a 8lan bus which seems to be the standard for the raid cards I have been able to find.

Are there any uber raid 5 cards out there that will actualy pump io at 4Gigabytes given enough disks?

The best I have been able to find so far in my search is the LSI MegaRaid 9285 around $999 with two External SFF-8088 ports I was thinking of connecting this card to two Norco Technologies DS-24E around $1400 each. While I think two Norcos DS-24E's should pump 2400megabytes of info each 4800 megabytes total if I strip accross all 48 disks but I doubt if the LSI MegaRaid 9285 will handle that much information sustained and I am afraid Raid performance will decrease and obviously, another concern is if I strip across the 2 Norcos DS 24E's then any momentary disconnect of the cable would destroy the raid 5 which is far to risky to move forward with.

Ideally I am looking for 5 Gigabytes of throughput in and out of the raid 5 card with one common volume which will then be shared out through the Infiniband QDR network as cheaply as possible.

Anyway, if any of you guys has a better idea please let me know in the next couple months its 5/25/2011 as of this post.
May 26, 2011 3:09:06 PM

By the Gods!

A 48 disk RAID 5 array? Even if you were to get this running at the speeds you wanted the risk of the array dying is so incredibly high!
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May 26, 2011 6:35:47 PM

Rusting In Peace said:
A 48 disk RAID 5 array? Even if you were to get this running at the speeds you wanted the risk of the array dying is so incredibly high!

Better than Raid 0, though.
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July 12, 2012 11:03:07 PM

Daniel925 said:
Hello,

I am trying to build a small cluster. I'm planning on using Infinibands QDR which has 5Gigabytes of throughput. The PCI-Express 2.0 standard maxes out at 4Gigabytes throughput for a 8lan bus which seems to be the standard for the raid cards I have been able to find.

Are there any uber raid 5 cards out there that will actualy pump io at 4Gigabytes given enough disks?

The best I have been able to find so far in my search is the LSI MegaRaid 9285 around $999 with two External SFF-8088 ports I was thinking of connecting this card to two Norco Technologies DS-24E around $1400 each. While I think two Norcos DS-24E's should pump 2400megabytes of info each 4800 megabytes total if I strip accross all 48 disks but I doubt if the LSI MegaRaid 9285 will handle that much information sustained and I am afraid Raid performance will decrease and obviously, another concern is if I strip across the 2 Norcos DS 24E's then any momentary disconnect of the cable would destroy the raid 5 which is far to risky to move forward with.

Ideally I am looking for 5 Gigabytes of throughput in and out of the raid 5 card with one common volume which will then be shared out through the Infiniband QDR network as cheaply as possible.

Anyway, if any of you guys has a better idea please let me know in the next couple months its 5/25/2011 as of this post.


If it's performance your seeking your probably better getting high performance drives wds blacks or ultrastars on relative commodity side, etc in raid 60 using LSI 9285CV-8E and Gen3 or 4 SSD drives in the array as massive data cache for reads/writes using LSI CacheCade feature and leveraging CacheVault instead BBU's on this CV model, I would use smaller raid stripe group, that massive group will fail as mtbf on that many drives is very high indeed and when it does the rebuild job will take sometime to complete, crazy in mission critical workload. If you've used large arrays groups before you'll know you'll get a lot of failures.
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May 2, 2013 1:39:19 PM

Daniel925 said:
Hello,

I am trying to build a small cluster. I'm planning on using Infinibands QDR which has 5Gigabytes of throughput. The PCI-Express 2.0 standard maxes out at 4Gigabytes throughput for a 8lan bus which seems to be the standard for the raid cards I have been able to find.

Are there any uber raid 5 cards out there that will actualy pump io at 4Gigabytes given enough disks?

The best I have been able to find so far in my search is the LSI MegaRaid 9285 around $999 with two External SFF-8088 ports I was thinking of connecting this card to two Norco Technologies DS-24E around $1400 each. While I think two Norcos DS-24E's should pump 2400megabytes of info each 4800 megabytes total if I strip accross all 48 disks but I doubt if the LSI MegaRaid 9285 will handle that much information sustained and I am afraid Raid performance will decrease and obviously, another concern is if I strip across the 2 Norcos DS 24E's then any momentary disconnect of the cable would destroy the raid 5 which is far to risky to move forward with.

Ideally I am looking for 5 Gigabytes of throughput in and out of the raid 5 card with one common volume which will then be shared out through the Infiniband QDR network as cheaply as possible.

Anyway, if any of you guys has a better idea please let me know in the next couple months its 5/25/2011 as of this post.



If i correctly read the spec of Infinibands QDR. It's 5Gb/s (Gigabits) not GB (Gigabytes) or 500MB/s
This can easy achieve with HW raid PCIe Gen2 16x ports from ATTO, Areca, HPT...
the HW RAID mention above can do over 1GB/sec sustain speed

PCIe x8 lanes has the bandwidth of 5Gb/s x8 = 40Gb/s, that is about eight times of Infinibands QDR.
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