On 31/10/13 13:06, Sharuzzaman Ahmat Raslan wrote: > Hi Holger, > > Based on short session of troubleshooting, I believe the machine > actually suffer from low I/O speed to the disk. Average read is about > 3 MB/s, which I considered slow for a SATA disk in IDE emulation.
Is that under load, or while idle? If it is under load, then it might be expected, remember throughput is very bad for HD when you have random load due to seek times. If it is idle and has that performance level, then there is something wrong. Even old IDE disks could do at least 30 to 50MB/s for large contiguous reads. > I'm planning to suggest to the customer to have a RAID 1 setup to > increase the I/O speed. I'm looking at possibilities to speed things > up by not having to change the overall setup. While RAID1 will assist in reliability and is one strategy to reduce downtime/data loss (but it isn't a backup), it also is not going to improve performance. With RAID1 you still need to write to both disks, and while it is theoretically possible to balance reads across both disks, it likely won't do that well without a proper hardware raid controller. Personally, my suggestion would be to consider using a SSD, since you are using such an old drive, probably you don't need a lot of space, so a 120GB SSD might be suitable. An SSD will handle random IO significantly better than any one or two drive system, with much higher transfer rates as well (there is no penalty for seek times with SSD). Again, personally, I've used a couple of systems with 5 x 480GB Intel 520s SSD in RAID5, and they have been working really well (except they were difficult to actually get stock of them most of this year, and I hear they are now replaced by a new model). Regards, Adam -- Adam Goryachev Website Managers P: +61 2 8304 0000 a...@websitemanagers.com.au F: +61 2 8304 0001 www.websitemanagers.com.au -- Adam Goryachev Website Managers www.websitemanagers.com.au ------------------------------------------------------------------------------ Android is increasing in popularity, but the open development platform that developers love is also attractive to malware creators. Download this white paper to learn more about secure code signing practices that can help keep Android apps secure. http://pubads.g.doubleclick.net/gampad/clk?id=65839951&iu=/4140/ostg.clktrk _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/