[wellylug] preliminary SATA Linux software RAID0/RAID1 comparison
Wood Brent
pcreso at pcreso.com
Tue Oct 12 20:23:46 NZDT 2004
Basic hardware: A64 socket 939 3500+ (ordered the day before AMD announce a 17%
price drop this month- sigh!) Nforce 250 chipset
2x Seagate SATA 80Gb drives (7200RPM/8Mb cache)
1Gb memory
drives are /dev/hda & /dev/hde
partitions:
/ = 20Gb on hda
/home = 20Gb on hde
4Gb swap on each
/raid0 = 20Gb on hda, 20Gb on hdb = 40Gb total (as /dev/md0)
/raid1 = 20Gb on hda, 20Gb on hdb = 20Gb total (as /dev/md1)
Mostly default settings from YaST on SuSE 9.1 to partition on install.
(& I know there is still plenty of unused disk...)
Some hdparm benchmarks, as an initial test...
(if anyone knows how to point bonnie++ at particular partitions/devices please
let me know....)
hdparm is basically returning simple data rates from cache & from disk, the
numbers are from about 4 runs:
hdparm -tT /dev/hda 1600 & 56Mb/sec
hdparm -tT /dev/hde 1600 & 55Mb/sec
hdparm -tT /dev/md0 1600 & 99Mb/sec
hdparm -tT /dev/md1 1600 & 45Mb/sec
I'm installing a Gb or so of data & software to use it, so will do some timed
trials for my GIS apps, but the initial look (admittedly hdparm is not an
extensive benchmark) is pretty suggestive.
I have run bonnie++ but can't see how to test specific partitions with it. As I
don't know which partitions it is using, I'm not including the results here.
Any suggestions/advice welcome.
Brent
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