Rediculously slow write times with Supermicro Board, SATA drives
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Probably need more info. Logs, what exactly it is you're writing, any tests or benchmarks you've tried, etc? How it's setup, RAID, H/W RAID, etc?
No raid or anything, the drives are connected right to the board.
Here is the test I ran:
# time dd if=/dev/zero of=file bs=1024 count=512288
512288+0 records in
512288+0 records out
524582912 bytes (525 MB) copied, 35.2333 seconds, 14.9 MB/s
Distribution: Ubuntu, Slackware, Gentoo, Fedora, Red Hat, Puppy Linux
Posts: 370
Rep:
You are reading from /dev/zero and writing to a file called "file". Where is "file" located? Is it on the same disk that you are reading from? This presumes that you are executing the dd command while in on /dev/zero
Please list the specific device names so that it is easier to understand what you are doing. Too many people write a description of what they are trying to do instead of actually what they are doing and without precise information it is impossible to give a specific if not precise answer.
First try booting with kernel option "hda=noprobe", and see if it works better. If not, try putting the drive in AHCI mode in the BIOS, make sure you have ahci enabled in the kernel.
You are reading from /dev/zero and writing to a file called "file". Where is "file" located? Is it on the same disk that you are reading from? This presumes that you are executing the dd command while in on /dev/zero
Please list the specific device names so that it is easier to understand what you are doing. Too many people write a description of what they are trying to do instead of actually what they are doing and without precise information it is impossible to give a specific if not precise answer.
/dev/zero is a virtual file maintained by the kernel to generate zeros upon demand. It does not exist on any drive anyplace. The test is valid, as far as it goes, to measure drive write speed.
When I ran the identical command in a bash window I opened, pointed at my home directory, on my heavily loaded and busy workstation, I got 47 mB/sec. The target drive is a 10K RPM SCSI drive.
Distribution: Ubuntu, Slackware, Gentoo, Fedora, Red Hat, Puppy Linux
Posts: 370
Rep:
Quote:
Originally Posted by jiml8
/dev/zero is a virtual file maintained by the kernel to generate zeros upon demand. It does not exist on any drive anyplace. The test is valid, as far as it goes, to measure drive write speed.
When I ran the identical command in a bash window I opened, pointed at my home directory, on my heavily loaded and busy workstation, I got 47 mB/sec. The target drive is a 10K RPM SCSI drive.
Thank you. I did not know that.
I ran the same test on an old server with IDE drives and it took 13.2785 seconds with 39.5 MB/s transfer.
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