John Goerzen <[email protected]> wrote on 02/23/2011 11:39:57 AM:
> Michael Stowe <mstowe <at> chicago.us.mensa.org> writes: > > > Another way to put this is that you'd like BackupPC to overcome > > performance problems caused by your amazingly slow I/O. Not that I'm > > arguing against rewriting BackupPC to accomodate slow media, but I'm > > certainly not going to bother, since it's certainly not slow for me. > > Well, I don't think that's entirely accurate. BackupPC is on the order of 10 > times slower than alternatives making full backups after the first. It is on > the order of 20-50 times slower than alternatives making incrementals. This > referring to the same disk setup. I think the numbers you're seeing are *very* unusual. I've got servers that do incrementals of servers that have hundreds of thousands of files, but only change a few files a day (like 8-10), and it takes just a few minutes to do an incremental on these systems. I have other servers that change 50% of the files on the system, which reflects about 30GB of incrementals per day. I think the largest file that changes is 7GB (not 25), but we're talking about large files here. That server only takes 45 minutes to back up. I have servers that are also more typical file-servers: hundreds of thousands of files, several hundred GB of used storage, and thousands of changed files per day equalling maybe 1-2GB of daily deltas. These servers take a decently long time to do a full (as in 700 minutes, or say 12 hours), and a relatively short time to do an incremental (under 2 hours easy). All of these file servers are plenty powerful (multi-core, multi-GB of RAM, SAS drives, etc.), but the backup servers are not: these are 1.5GHz VIA processors (read: SLOW) with 512MB RAM and a single SATA drive (1TB, IIRC.), and are connected via 100Mb (right: 100, *not* 1,000) Ethernet. > > Might I suggest that you back up to something quicker, and then copy it > > over to your USB drive? (If that's too slow, than I fail to see how > > BackupPC can do any better.) > > I don't expect that to be worth the expense. In other words, half of 55 hours > is still too long. Again, I think you've got something fundamentally wrong with your hardware, software or configuration. The results you are seeing just seem *wrong*. Timothy J. Massey Out of the Box Solutions, Inc. Creative IT Solutions Made Simple! http://www.OutOfTheBoxSolutions.com [email protected] 22108 Harper Ave. St. Clair Shores, MI 48080 Office: (800)750-4OBS (4627) Cell: (586)945-8796
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