<html><head><style type='text/css'>p { margin: 0; }</style></head><body><div style='font-family: Arial; font-size: 12pt; color: #000000'>Right now we're using the cpio to copy the data. If there is a faster option I'm open to at least try it.<div><br></div><div>Thanks to everyone for your suggestions, I'll take any advice I can get.</div><div> <br>----- Original Message -----<br>From: "Greg Freemyer" <greg.freemyer@gmail.com><br>To: "Atlanta Linux Enthusiasts - Yes! We run Linux!" <ale@ale.org><br>Sent: Thursday, October 29, 2009 5:45:49 PM GMT -05:00 US/Canada Eastern<br>Subject: Re: [ale] Disk IO Question<br><br>On Thu, Oct 29, 2009 at 4:49 PM, <mmillard1@comcast.net> wrote:<br>> I have a Suse OES server running on an IBM 346with 2 gig of RAM. I've<br>> installed two Addonics Multilane SATA cards connect with Multilane cables<br>> to external SATA enclosures housing 4 WD Caviar Green 1.5 TB Drives.<br>><br>><br>><br>> I have about 1.8 TB of Data on one Enclosure which changes daily. My plan<br>> was to copy the 1.8 TB to the second enclosure daily and send the drives in<br>> that unit off site.<br><br>How are you copying? dd, rsync, cp --archive, etc.<br><br>> My expectation was that by having 4 independant SATA paths per unit<br>> would give me substantial performance when moving data between these units.<br><br>I agree.<br><br>> I'm seeing a constant speed of about 60 gig per hour. This is much slower<br>> than I expected. Have any of you done anything like this? Is this the kind<br>> of performance I should expect? Hopefull some of you bright people can<br>> share some wisdom with me.<br><br>60 GB per hour may or may not be slow. If the files are very small, I<br>find 100K files / hr to be a limiting factor in some cases.<br><br>I also do a lot of "dd if=/dev/sdb of=/dev/sdc bs=4k<br>conv=noerror,sync" copying of filesystems. I see speeds of 250GB/hr<br>even with just drive to drive transfers. You raid array should be<br>much faster.<br><br>So if you can unmount your primary drive every night, you should be<br>able to make a dd copy every night. I have one vendor that is telling<br>me they are moving data around at 1TB/hr. (I'm not sure how true that<br>is.)<br><br>Greg<br><br>_______________________________________________<br>Ale mailing list<br>Ale@ale.org<br>http://mail.ale.org/mailman/listinfo/ale<br>See JOBS, ANNOUNCE and SCHOOLS lists at<br>http://mail.ale.org/mailman/listinfo<br></div></div></body></html>