Messages in this thread |  | | Date | Wed, 4 Sep 2002 19:57:29 +0200 | From | Jan Kasprzak <> | Subject | IDE write speed (Promise versus AMD) |
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Hello, all!
I have a machine with six identical IDE drives (WD1200BB), three of them connected to the on-board controller (it is AMD 768MPX chipset), and other three are connected to the Promise controller (PDC 20269). All drives are UDMA 100, read speed measured by "hdparm -t /dev/hd[abcefg]" is about 45 MBytes/s for every drive. However, the write speed seems to differ between AMD and Promise controllers. I've tried to do
time sh -c 'dd if=/dev/zero of=/dev/hdX bs=1024k count=2048; sync'
- it takes about 50 seconds (~40 MByte/s write speed) on hda, hdb and hdc, but 2 minutes 48 seconds (~12 MByte/s write speed) on hde, hdf and hdg. I have 1 GB of RAM, server is dual athlon 2000+. Kernel is 2.4.20-pre5-ac1.
Is there any problem with the Promise IDE driver on Linux?
Thanks,
-Yenya
-- | Jan "Yenya" Kasprzak <kas at {fi.muni.cz - work | yenya.net - private}> | | GPG: ID 1024/D3498839 Fingerprint 0D99A7FB206605D7 8B35FCDE05B18A5E | | http://www.fi.muni.cz/~kas/ Czech Linux Homepage: http://www.linux.cz/ | Pruning my incoming mailbox after being 10 days off-line, sorry for the delayed reply. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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