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  #1 (permalink)  
Old 6th August, 2002, 06:44 PM
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IDE RAID-5 controller choices?

are Adaptec and Promise the only ones making IDE RAID-5 cards. The guys at work wanna try one for a backup server, but I have never done IDE raid-5 before, only scsi

any suggestions? TIA!!!
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Old 6th August, 2002, 07:51 PM
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Never done RAID 5, But have used Promise for years and never had a problem with RAID 0....For what it's worth":O}
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Old 6th August, 2002, 11:39 PM
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umm....... dont do it? Unless the drives were only to be used like monthly- i just blew a couple of drives in a pIII file server after 9 months- poor things fried........ good luck!
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Old 7th August, 2002, 07:14 PM
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3Ware Escalade 7500 comes in three versions, 7500-4 support 4 drives, 7500-8 supporting 8 drives, and 7500-12 supporting 12drives.

Adaptec ATA RAID 2400A supports 4 drives.

Promise SuperTRAK SX6000 supports 6 drives.


Xbit did a bit of a review over at http://www.xbitlabs.com/storage/raid-roundup-2/ although I'm not sure how much I trust ppl like Xbit to really understand RAID 5 systems, given they didn't measure degraded performance.

Things to watch out for:
Hot swap ability - this will need special cages, and will require the RAID controller to support this. May not be necessary for your usage.

Online rebuild - allows the RAID controller to rebuild the array whilst it is still in use. Unfortunately this will slaughter performace, but hey, the array was degraded anyway! Offline rebuild may be acceptable if you have a large enough window.

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Old 8th August, 2002, 06:49 AM
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thanks man!! Hot swap is of no concern to me, and its a backup server, so downtime is not that big of deal.
I was gonna get the promise, but they were out of stock at or wholesaler....so adaptec 2400a here I come :-D
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Old 10th August, 2002, 03:26 AM
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Say it ain't so Joe...

You are going to throw away all of the speed benefits of a SCSI raid 5 for IDE?

IDE writes fast as hell, so if you are really concerned with how fast you can save a file, by all means, go IDE. IDE, however reads like ****, so be prepared to never notice any speed increase while opening files and proggies.

SCSI on the other hand, writes for ****, and reads damn fast. which is more important to you?

(I am biases, as my current "main rig" has 22 SCSI drives (7 are CD's, and the other 15 are divided into three raid arrays.) and only one IDE CD (burner))
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Old 10th August, 2002, 09:51 PM
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Quote:
Originally posted by Azriel
SCSI on the other hand, writes for ****, and reads damn fast. which is more important to you?
(I am biases, as my current "main rig" has 22 SCSI drives (7 are CD's, and the other 15 are divided into three raid arrays.) and only one IDE CD (burner))
?? Writes for SCSI are fast - if you have decent drives, far faster than IDE. Comparing the faster IDE drives with the faster SCSI drives show that writes complete in half the time with the SCSI drives.

Otherwise logging and audit operations would be badly compromised on database systems!

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Old 10th August, 2002, 09:54 PM
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Aidan.... yer gonna need to back that up with some benchmarks... the poor write performance of SCSI is common knowledge.
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Old 10th August, 2002, 10:39 PM
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No kidding.............. scsi sux unless its u360 in writing, but normal IDE 7200 kills it...... prove me wrong plz!
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Old 10th August, 2002, 11:25 PM
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Ok..

Average write service time for a Maxtor D740X (ATA-133) is 12.7ms.
AWST for a WD1200JB(ATA-100) is 14.1ms
AWST for a Fujitsu MAM3367 (Ultra160) is 6.3ms
AWST for an IBM Ultrastar 73LZX(Ultra160) is 8.9ms

The D740X had the fastest AWST of the IDE drives. The MAM3367 had the fastest AWST of the SCSI drives.

Average write service time is defined as the average time it takes to write a sector, based on 25,000 random sectors across the breadth of the disk surface.

Source: StorageReview.com

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Last edited by Áedán; 10th August, 2002 at 11:28 PM.
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Old 10th August, 2002, 11:36 PM
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RAID arrays...

Winchester FlashDisk, consists of 8 Seagate Cheetah 75GB drives. H/W controller presents all 8 drives as a single volume. (SCSI)

In two software striped RAID5 arrays managed write speed of 115MB/sec. (16 disks across one controller)
Single RAID5 array managed 66MB/sec. (8 disks)


3Ware Escalade 6800 based system - two 6800 controllers with 8 IBM drives of 75Gb each. (IDE)

Two software striped RAID0 arrays (of 8 disks) managed a write speed of 73MB/sec. (16 disks across two controllers)
Single RAID5 array managed 6MB/sec.(8 disks)(!?!)

Source: Caltech
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Old 10th August, 2002, 11:57 PM
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Software driven RAID0 array...

4 IBM DeskStar 75GXP 30GB disks (IDE) Sequential write speed of 6.9MB/sec
4 IBM Ultrastar 36ZX (18Gb) disks (SCSI) Sequential write speed of 23.9MB/sec

Interestingly, the SCSI drives compared here have a slower media speed, due to the lower density.

Source: University of Virginia
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Old 11th August, 2002, 12:04 AM
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Just something of interest here....

Someone put together a system, using IDE drives with an IO throughput of 1GByte/sec! However, they used multiple hosts, and spread both the IO and processing load over the host machines, so it's not quite the same as an adapter that'll manage 1GByte/sec.

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Old 11th August, 2002, 06:38 AM
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well this is just for a backup server , and we really couldn't afford 400 gigabytes of scsi raid-5
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