[opensuse] Disk Performance - Then & Now..
Listmates, I ran a comparison on an old file server just to check disk performance of the backup machine. I compared it to a new machine and the difference validates Mohr's law: [AMD K62-450 w/2 20G IBM Deskstar 7200 rpm drives] sudo hdparm -tT /dev/sda /dev/sda: Timing cached reads: 72 MB in 2.00 seconds = 35.94 MB/sec Timing buffered disk reads: 26 MB in 3.09 seconds = 8.41 MB/sec [AMD Phenom 9850 w/2 500G Seagates in RAID1] /dev/sda: Timing cached reads: 3504 MB in 2.00 seconds = 1751.75 MB/sec Timing buffered disk reads: 188 MB in 3.02 seconds = 62.33 MB/sec /dev/sdb: Timing cached reads: 3494 MB in 2.00 seconds = 1746.89 MB/sec Timing buffered disk reads: 200 MB in 3.01 seconds = 66.53 MB/sec /dev/dm-0: Timing cached reads: 3432 MB in 2.00 seconds = 1716.32 MB/sec Timing buffered disk reads: 194 MB in 3.02 seconds = 64.27 MB/sec The Software RAID penalty -- virtually non-existent as far as hdparm is concerned. The results are astounding when you think what has happened in just a few years... -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
David C. Rankin wrote:
Listmates,
I ran a comparison on an old file server just to check disk performance of the backup machine. I compared it to a new machine and the difference validates Mohr's law:
[AMD K62-450 w/2 20G IBM Deskstar 7200 rpm drives]
sudo hdparm -tT /dev/sda /dev/sda: Timing cached reads: 72 MB in 2.00 seconds = 35.94 MB/sec Timing buffered disk reads: 26 MB in 3.09 seconds = 8.41 MB/sec
[AMD Phenom 9850 w/2 500G Seagates in RAID1]
/dev/sda: Timing cached reads: 3504 MB in 2.00 seconds = 1751.75 MB/sec Timing buffered disk reads: 188 MB in 3.02 seconds = 62.33 MB/sec /dev/sdb: Timing cached reads: 3494 MB in 2.00 seconds = 1746.89 MB/sec Timing buffered disk reads: 200 MB in 3.01 seconds = 66.53 MB/sec
/dev/dm-0: Timing cached reads: 3432 MB in 2.00 seconds = 1716.32 MB/sec Timing buffered disk reads: 194 MB in 3.02 seconds = 64.27 MB/sec
The Software RAID penalty -- virtually non-existent as far as hdparm is concerned.
That is probably due to getting rid of the pci bus. Here's a hardware raid (3ware 9650SE, 5 x 750 GB Seagate SATA2): mordor:~ # hdparm -tT /dev/mapper/system-var /dev/mapper/system-var: Timing cached reads: 13236 MB in 2.00 seconds = 6626.75 MB/sec Timing buffered disk reads: 1130 MB in 3.00 seconds = 376.05 MB/sec -- Sandy List replies only please! Please address PMs to: news-reply2 (@) japantest (.) homelinux (.) com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Sandy Drobic wrote:
David C. Rankin wrote:
/dev/dm-0: Timing cached reads: 3432 MB in 2.00 seconds = 1716.32 MB/sec Timing buffered disk reads: 194 MB in 3.02 seconds = 64.27 MB/sec
The Software RAID penalty -- virtually non-existent as far as hdparm is concerned.
That is probably due to getting rid of the pci bus. Here's a hardware raid (3ware 9650SE, 5 x 750 GB Seagate SATA2):
mordor:~ # hdparm -tT /dev/mapper/system-var
/dev/mapper/system-var: Timing cached reads: 13236 MB in 2.00 seconds = 6626.75 MB/sec Timing buffered disk reads: 1130 MB in 3.00 seconds = 376.05 MB/sec
Here's the data of my old server (old pci hardware raid, 3 x 18 GB SCSI): /dev/rd/c0d0p3: Timing cached reads: 298 MB in 2.00 seconds = 148.70 MB/sec Timing buffered disk reads: 62 MB in 3.02 seconds = 20.56 MB/sec Quite a difference. (^-^) -- Sandy List replies only please! Please address PMs to: news-reply2 (@) japantest (.) homelinux (.) com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Sandy Drobic wrote:
That is probably due to getting rid of the pci bus. Here's a hardware raid (3ware 9650SE, 5 x 750 GB Seagate SATA2):
mordor:~ # hdparm -tT /dev/mapper/system-var
/dev/mapper/system-var: Timing cached reads: 13236 MB in 2.00 seconds = 6626.75 MB/sec Timing buffered disk reads: 1130 MB in 3.00 seconds = 376.05 MB/sec
Here's the data of my old server (old pci hardware raid, 3 x 18 GB SCSI):
/dev/rd/c0d0p3: Timing cached reads: 298 MB in 2.00 seconds = 148.70 MB/sec Timing buffered disk reads: 62 MB in 3.02 seconds = 20.56 MB/sec
Quite a difference. (^-^)
The SCSI transfer speed also matters a lot - those 18Gb drives were pretty slow when compared to todays U320 drives. /Per Jessen, Zürich -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
Sandy Drobic wrote:
Sandy Drobic wrote:
David C. Rankin wrote:
/dev/dm-0: Timing cached reads: 3432 MB in 2.00 seconds = 1716.32 MB/sec Timing buffered disk reads: 194 MB in 3.02 seconds = 64.27 MB/sec
The Software RAID penalty -- virtually non-existent as far as hdparm is concerned. That is probably due to getting rid of the pci bus. Here's a hardware raid (3ware 9650SE, 5 x 750 GB Seagate SATA2):
mordor:~ # hdparm -tT /dev/mapper/system-var
/dev/mapper/system-var: Timing cached reads: 13236 MB in 2.00 seconds = 6626.75 MB/sec Timing buffered disk reads: 1130 MB in 3.00 seconds = 376.05 MB/sec
Here's the data of my old server (old pci hardware raid, 3 x 18 GB SCSI):
/dev/rd/c0d0p3: Timing cached reads: 298 MB in 2.00 seconds = 148.70 MB/sec Timing buffered disk reads: 62 MB in 3.02 seconds = 20.56 MB/sec
Quite a difference. (^-^)
Sandy, Are those 5 750G drives are in RAID0/RAID5 ? That is incredible disk performance. -- David C. Rankin, J.D., P.E. Rankin Law Firm, PLLC 510 Ochiltree Street Nacogdoches, Texas 75961 Telephone: (936) 715-9333 Facsimile: (936) 715-9339 www.rankinlawfirm.com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
David C. Rankin wrote:
Sandy Drobic wrote:
Sandy Drobic wrote:
David C. Rankin wrote:
/dev/dm-0: Timing cached reads: 3432 MB in 2.00 seconds = 1716.32 MB/sec Timing buffered disk reads: 194 MB in 3.02 seconds = 64.27 MB/sec
The Software RAID penalty -- virtually non-existent as far as hdparm is concerned. That is probably due to getting rid of the pci bus. Here's a hardware raid (3ware 9650SE, 5 x 750 GB Seagate SATA2):
mordor:~ # hdparm -tT /dev/mapper/system-var
/dev/mapper/system-var: Timing cached reads: 13236 MB in 2.00 seconds = 6626.75 MB/sec Timing buffered disk reads: 1130 MB in 3.00 seconds = 376.05 MB/sec
Here's the data of my old server (old pci hardware raid, 3 x 18 GB SCSI):
/dev/rd/c0d0p3: Timing cached reads: 298 MB in 2.00 seconds = 148.70 MB/sec Timing buffered disk reads: 62 MB in 3.02 seconds = 20.56 MB/sec
Quite a difference. (^-^)
Are those 5 750G drives are in RAID0/RAID5 ? That is incredible disk performance.
Yes, it's a RAID5. Though write performance is much less. Most of the time this is theoretical data with no real life worth. In most cases it is more important how fast many small files are written or read. Still, since the controller is working in write-back mode, write performance is acceptable in my case. -- Sandy List replies only please! Please address PMs to: news-reply2 (@) japantest (.) homelinux (.) com -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On 2008/10/23 02:48 (GMT-0500) David C. Rankin composed:
I ran a comparison on an old file server just to check disk performance of the backup machine. I compared it to a new machine and the difference validates Mohr's law:
[AMD K62-450 w/2 20G IBM Deskstar 7200 rpm drives]
sudo hdparm -tT /dev/sda /dev/sda: Timing cached reads: 72 MB in 2.00 seconds = 35.94 MB/sec Timing buffered disk reads: 26 MB in 3.09 seconds = 8.41 MB/sec
Almost certainly UDMA33, which dates back to around 11 years ago. I'm not aware of any Socket 7 chipsets that supported UDMA66. If your K6/2-450 was state of the art speed when its motherboard was acquired, it would probably have pre-dated UDMA66 anyway.
[AMD Phenom 9850 w/2 500G Seagates in RAID1]
/dev/sda: Timing cached reads: 3504 MB in 2.00 seconds = 1751.75 MB/sec Timing buffered disk reads: 188 MB in 3.02 seconds = 62.33 MB/sec /dev/sdb: Timing cached reads: 3494 MB in 2.00 seconds = 1746.89 MB/sec Timing buffered disk reads: 200 MB in 3.01 seconds = 66.53 MB/sec
/dev/dm-0: Timing cached reads: 3432 MB in 2.00 seconds = 1716.32 MB/sec Timing buffered disk reads: 194 MB in 3.02 seconds = 64.27 MB/sec
SATA 300 probably, which itself needs a test of Moore's law. I doubt you'll find a doubling over real world performance of an equivalent system only 18-24 months older.
The Software RAID penalty -- virtually non-existent as far as hdparm is concerned.
The results are astounding when you think what has happened in just a few years...
More like 9 years (UDMA33 to SATA300), in which of late the law has been breaking down. Still, what we have now begs the question how fast is fast enough. I stopped being impressed with "faster" 5 years ago, around the time gigabit ethernet and then DDR2 RAM hit the street. Even with FIOS the internet is most often the bottleneck noticed by the face in front of the display, and a big bottleneck it is. -- "Everyone should be quick to listen, slow to speak, and slow to become angry." James 1:19 NIV Team OS/2 ** Reg. Linux User #211409 Felix Miata *** http://fm.no-ip.com/ -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
On Thu, Oct 23, 2008 at 8:15 AM, Felix Miata
On 2008/10/23 02:48 (GMT-0500) David C. Rankin composed:
The Software RAID penalty -- virtually non-existent as far as hdparm is concerned.
The results are astounding when you think what has happened in just a few years...
More like 9 years (UDMA33 to SATA300), in which of late the law has been breaking down.
Here's my results from an old HP NetServer E60 Dual P3/500Mhz, 256MB RAM: Stand alone SCSI drive: /dev/sda: Timing cached reads: 258 MB in 2.00 seconds = 129.00 MB/sec Timing buffered disk reads: 92 MB in 3.04 seconds = 30.26 MB/sec Software Raid 5(on disks 2-4) /dev/sdb: Timing cached reads: 258 MB in 2.00 seconds = 129.00 MB/sec Timing buffered disk reads: 90 MB in 3.02 seconds = 29.84 MB/sec As you can see, the software RAID 5 was slightly slower than accessing the standalone disk. The drives are basically limited by the fact that I am currently using the onboard SCSI controller, which is only 40MB/s. sda and sdb are Fujitsu MAJ3091MP(10k rpm, U160, 4k buffer) and sdc and sdd are HP A 68-F305(Which I think are similar specs). However, since this machine is a data backup server, speed isn't really important because everything sent to it comes in over 100Mb ethernet right now. If I move it to gigabit, then I may move it to a faster PCI SCSI card..... -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org For additional commands, e-mail: opensuse+help@opensuse.org
participants (5)
-
David C. Rankin -
Felix Miata -
Larry Stotler -
Per Jessen -
Sandy Drobic