Hi, I'm using software RAID5 on 4 IDE devices and it appears to be really slow. This is my second array, the first one wasn't really faster at all. Details: - Tyan S2462UNG Thunder K7 - 2x AMD Athlon MP 1.2GHz - 4x 256MB PC2100 reg. ECC DDR-SDRAM First (old) array: - 2x Promise Ultra100 PDC20267 UDMA100-IDE PCI adapter - 4x IBM Deskstar 60GXP IC35L060AVER07 61.49GB 7200rpm 2MB cache UDMA100-IDE HDD - 1 disk per bus - 4x 90cm UDMA133 cable, rounded (they were advertised to be ok for 133) - 128k chunk-size, left-symmetric - ReiserFS 3.6 with no special options Second (current) array: - 2x Promise Ultra133TX2 PDC20269 UDMA133-IDE PCI adapter - 4x Western Digital WD1200JB 120GB 7200rpm 8MB cache UDMA100-IDE HDD - 1 disk per bus - 4x 90cm UDMA133 cable, rounded (same as above) - 64k chunk-size, left-symmetric - Ext3 with "-b 4096 -R stride=16" I do experience nearly the same with both configurations: The max. transfer rate shown by e.g. 'mc' is ~45MB (when copying a ~700M file from the array onto an attached SCSI disk), but gets stuck some times in between. Same with copying from the array to the array (another location/filename). Copying from the SCSI disk to the array starts with slow ~6M/s and raises to somewhat around 19M/s at the end. Is this a hardware problem? Should I try other cables (I cannot really use shorter cables, because my cube-case is too big :-( 45cm cables just cannot reach the disks)? Overall I'm not very satisfied with the current situation, as you'd expect ;-) The hardware *should* be capable of doing much better, I believe. I'd be pleased to give more details as needed. Should I run any tiobench/tiotest or bonnie++ benchmarks? TIA. -- Wolfram Schlich; Friedhofstr. 8, D-88069 Tettnang; +49-(0)178-SCHLICH - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
