It may be too late for this re-sync, but in the future do this: echo 100000 > /proc/sys/dev/raid/speed_limit_max The default speed limit is 10000, that's what you are getting. So you have reached a software imposed limit, not a hardware limit. -----Original Message----- From: linux-raid-owner@vger.kernel.org [mailto:linux-raid-owner@vger.kernel.org] On Behalf Of James R Bamford Sent: Tuesday, November 18, 2003 5:05 PM To: linux-raid@vger.kernel.org Subject: Is my raid setup speed ok?! Just resyncing my full partitions now hopefully ready for use now that i've got a grasp of how its working.. i've posted before but here is the current progress on it sync-ing [root@backup root]# cat /proc/mdstat Personalities : [raid1] read_ahead 1024 sectors md0 : active raid1 hdg1[1] hde1[0] 156288256 blocks [2/2] [UU] [====>................] resync = 24.8% (38889996/156288256) finish=195.6min speed=10001K/sec unused devices: <none> the speed varies but its around 10000k/sec This is driven off a Promise Ultra 100 ATA controller.. a p3 450mhz ~450meg ram (a weak link possibly), and 2 x 160gig Samsung SP1614N drives with 8meg cache just ran hdparm to check dma was on [root@backup root]# hdparm /dev/hde /dev/hde: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 19457/255/63, sectors = 312581808, start = 0 [root@backup root]# hdparm /dev/hdg /dev/hdg: multcount = 16 (on) IO_support = 0 (default 16-bit) unmaskirq = 0 (off) using_dma = 1 (on) keepsettings = 0 (off) readonly = 0 (off) readahead = 8 (on) geometry = 19457/255/63, sectors = 312581808, start = 0 Is this speed normal.. someone told me drives can get up to 20-30meg/s .. I'd of expected my drives to be near to that.. I get very good performance with these drives in my other machines.. just wondering if its quite low... if there is anything i can do to change this!? what kind of speeds have other people had with IDE drives? Thanks Jim - 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 - 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
