On Mon, Aug 27, 2007 at 08:08:08PM +1200, Richard Scobie wrote: > I was just interested to see if anyone had tested a similar md RAID 5 using > these chips on Linux. /dev/md2 is a 5-disk RAID5 on a Sonnet Fusion 500 enclosure (3726 based): http://www.sonnettech.com/product/fusiond500p-eseries.html Drives are 5x Seagate ST3320620AS with the 3.AAE firmware. Controller is a PCIe x1 sata_sil24 unit. grubbs-int / # cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md2 : active raid5 sdf1[0] sdj1[4] sdi1[3] sdh1[2] sdg1[1] 1250274304 blocks level 5, 64k chunk, algorithm 2 [5/5] [UUUUU] bitmap: 0/150 pages [0KB], 1024KB chunk unused devices: <none> grubbs-int / # hdparm -tT /dev/md2 /dev/md2: Timing cached reads: 2334 MB in 2.00 seconds = 1167.20 MB/sec Timing buffered disk reads: 350 MB in 3.01 seconds = 116.32 MB/sec It should exceed that speed - if I run hdparm -tT on 3 or more separate drives in the array at the same time, their combined speed does not exceed 120Mb/sec (a single drive manages 71Mb/sec) - The system does claim it negated at 3Gbit, so I've wondering about a firmware bug in the sil24 or sil3726. Other than that, I can recommend the Sonnet unit for it's nice engineering, incl. a hotswap fan at the back - just perhaps a overpriced. -- Robin Hugh Johnson Gentoo Linux Developer & Council Member E-Mail : robbat2@xxxxxxxxxx GnuPG FP : 11AC BA4F 4778 E3F6 E4ED F38E B27B 944E 3488 4E85
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