SCSI with PCI card vs IDE on 9.2 off topic a bit
Hi- Does anyone have any experience if a scsi dirve on a PCI card is faster than IDE with 9.2 SUSE? If so how much faster and what PCI cards and scsi drives are you using? I am reading and writing a 0.5 gb geological model multiple times and seem to be IO bound Thanx Robert (Bob) L. Sandefur PE Senior Geostatistician / Reserve Analyst CAM 200 Union Suite G-13 Lakewood, Co 80228 rsandefur@cam-llc.com 303 472-3240 (cell) <-best choice 303 716-1617 ext 14
I was running a 5200K RPM IDE drive and now am running Adaptec 29160 PCI SCSI card with 10,000K RPM SCSI drive. Yes I do see a difference in speed :) bob sandefur wrote:
Hi- Does anyone have any experience if a scsi dirve on a PCI card is faster than IDE with 9.2 SUSE? If so how much faster and what PCI cards and scsi drives are you using? I am reading and writing a 0.5 gb geological model multiple times and seem to be IO bound Thanx Robert (Bob) L. Sandefur PE Senior Geostatistician / Reserve Analyst CAM 200 Union Suite G-13 Lakewood, Co 80228
rsandefur@cam-llc.com
303 472-3240 (cell) <-best choice
303 716-1617 ext 14
The 10k RPM SCSI drives generally have slightly higher bandwidth and alot lower seek time than 7200 RPM IDE drives. I usually use the Maxtor Atlas 10k IV and more recently Maxtor Atlas 10K V drives as I think they are very solid performers. 15k RPM drives are usually not worth the premium as they don't have much higher bandwidth just lower seek times. For a slightly lower price tag I can recommend the Western Digital Raptor drive. It is a 10k RPM SATA drive that performs just as well as a 10k RPM SCSI drive, at least for streaming (high bandwidth) applications. But the best solution would be for you to buy some more memory and create a ramdisk and do your calculations there. Since you only need 0.5 GB that would be the best solution in my opinion. After you are done with your simulation you can copy the resulting file to disk just once. On Friday 26 November 2004 15:46, dave wrote:
I was running a 5200K RPM IDE drive and now am running Adaptec 29160 PCI SCSI card with 10,000K RPM SCSI drive.
Yes I do see a difference in speed :)
bob sandefur wrote:
Hi- Does anyone have any experience if a scsi dirve on a PCI card is faster than IDE with 9.2 SUSE? If so how much faster and what PCI cards and scsi drives are you using? I am reading and writing a 0.5 gb geological model multiple times and seem to be IO bound Thanx Robert (Bob) L. Sandefur PE Senior Geostatistician / Reserve Analyst CAM 200 Union Suite G-13 Lakewood, Co 80228
rsandefur@cam-llc.com
303 472-3240 (cell) <-best choice
303 716-1617 ext 14
Hi- I was booted in windows XP so I tried the RAM disk solution suggested by Peter and got a factor of 2 improvement running cygwin and the Cenatek XP ram disk. This is more than I would have expected going to SCSI so in this case it appears RAM disk is the way to go. Thanx to all who replied -----Original Message----- From: Peter Rundberg [mailto:peter@gridcore.se] Sent: Friday, November 26, 2004 08:05 To: suse-amd64@suse.com Subject: Re: [suse-amd64] SCSI with PCI card vs IDE on 9.2 off topic a bit The 10k RPM SCSI drives generally have slightly higher bandwidth and alot lower seek time than 7200 RPM IDE drives. I usually use the Maxtor Atlas 10k IV and more recently Maxtor Atlas 10K V drives as I think they are very solid performers. 15k RPM drives are usually not worth the premium as they don't have much higher bandwidth just lower seek times. For a slightly lower price tag I can recommend the Western Digital Raptor drive. It is a 10k RPM SATA drive that performs just as well as a 10k RPM SCSI drive, at least for streaming (high bandwidth) applications. But the best solution would be for you to buy some more memory and create a ramdisk and do your calculations there. Since you only need 0.5 GB that would be the best solution in my opinion. After you are done with your simulation you can copy the resulting file to disk just once. On Friday 26 November 2004 15:46, dave wrote:
I was running a 5200K RPM IDE drive and now am running Adaptec 29160 PCI SCSI card with 10,000K RPM SCSI drive.
Yes I do see a difference in speed :)
bob sandefur wrote:
Hi- Does anyone have any experience if a scsi dirve on a PCI card is faster than IDE with 9.2 SUSE? If so how much faster and what PCI cards and scsi drives are you using? I am reading and writing a 0.5 gb geological model multiple times and seem to be IO bound Thanx Robert (Bob) L. Sandefur PE Senior Geostatistician / Reserve Analyst CAM 200 Union Suite G-13 Lakewood, Co 80228
rsandefur@cam-llc.com
303 472-3240 (cell) <-best choice
303 716-1617 ext 14
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----- Original Message -----
From: "Peter Rundberg"
The 10k RPM SCSI drives generally have slightly higher bandwidth and alot lower seek time than 7200 RPM IDE drives. I usually use the Maxtor Atlas 10k IV and more recently Maxtor Atlas 10K V drives as I think they are very solid performers. 15k RPM drives are usually not worth the premium as they don't have much higher bandwidth just lower seek times.
You are incorrect on the 15K RPM info here. There is a better begin and end sustained rates of up to 30% between the 10k and 15k drives. They also offer more overall performance when in a multi-drive configuration. So much so that I now buy 16 15k drives instead of the usuall 16 10k drives for my RAID-5 config's. Brad Dameron SeaTab Software www.seatab.com
Hi Bob: You have a number of options if you are really IO bound and you are doing large sequential reads/writes (and not random reads/writes): 1) RAID0 (striping): This can get you near to the theoretical max performance out of the bus the drive controller is attached to. In the case of IDE controllers on the motherboard, the best you typically could do would be 133 MB/s, though I have not seen more than about 110 MB/s sustained sequential large block reads across a 2 way stripe. With a PCI-X based controller card and enough SATA drives, you could get (theoretically) 12x55MB/s or about 660 MB/s (for a 12 way stripe across SATA). You would be limited by your DMA and interrupt rates. You could also do this with SCSI, just for a great deal more money. Note: FC will buy you at most 200 MB/s, so FC connected disk is not better than a 3ware card (actually worse, as the 3ware will give you in the best case, about 600 MB/s). U320 based SCSI will top out at 320 MB/s. 2) create a large ram disk: You have to have enough memory for the ram disk, the disk cache, and enough room to compute with. This is relatively inexpensive compared to other solutions, and would give you GB/s access to your data. If you are stuck doing many random rw operations, you might need to get the SCSI disk which handles the random rw better than SATA. If this is across a cluster of machines, and you need to distribute the computations with the data, you might look at Panasas disk. I have used them in sustained 1.2 and 1.6 GB/s work across some sizeable Linux clusters. Joe bob sandefur wrote:
Hi- Does anyone have any experience if a scsi dirve on a PCI card is faster than IDE with 9.2 SUSE? If so how much faster and what PCI cards and scsi drives are you using? I am reading and writing a 0.5 gb geological model multiple times and seem to be IO bound Thanx Robert (Bob) L. Sandefur PE Senior Geostatistician / Reserve Analyst CAM 200 Union Suite G-13 Lakewood, Co 80228
rsandefur@cam-llc.com
303 472-3240 (cell) <-best choice
303 716-1617 ext 14
-- Joseph Landman, Ph.D Founder and CEO Scalable Informatics LLC, email: landman@scalableinformatics.com web : http://www.scalableinformatics.com phone: +1 734 612 4615
Hi Bob, I used to perform computationally and I/O expensive Lanczos diagonalizations on Opteron machines writing and reading up to 4 GB of data at each step without problems. If you have enough RAM for filesystem cacheing (let us say, 4 GB) then you don't have to search for a particular I/O solution, reading and writing 0.5 GB of data should be fast. To further increase the I/O bandwidth you can set up an inexpensive RAID0 array of SATA disks and put at least 4GB of RAM on your system. - Jose Luis bob sandefur wrote:
Hi- Does anyone have any experience if a scsi dirve on a PCI card is faster than IDE with 9.2 SUSE? If so how much faster and what PCI cards and scsi drives are you using? I am reading and writing a 0.5 gb geological model multiple times and seem to be IO bound Thanx Robert (Bob) L. Sandefur PE Senior Geostatistician / Reserve Analyst CAM 200 Union Suite G-13 Lakewood, Co 80228
rsandefur@cam-llc.com
303 472-3240 (cell) <-best choice
303 716-1617 ext 14
participants (6)
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bob sandefur -
Brad Dameron -
dave -
Joe Landman -
Jose Luis Ricardo Chavez -
Peter Rundberg