Re: [BackupPC-users] Really slow with rsync, even on incrementals
2011-02-23 20:23:59
Timothy J Massey <tmassey <at> obscorp.com> writes:
> Encryption is *very* CPU-intensive. For example,
> from what I've seen (mostly with scp), 1MB/s is a *good* amount of data
> transfer while using encryption! That's great for your average home-drive
I ran some bonnie++ benchmarks on the filesystem in question (backed by USB disk
and compression). It showed 25MB/s block write, 4.5MB/s block rewrite, and
6MB/s block read. So by even a pessimistic benchmark that is 4.5 times as fast
as 1MB/s ;-)
> or flash drive type storage, but BackupPC lives and dies by throughput...
> Are you also using compression? Good luck. Compression
> is almost as CPU intensive as encryption! (I forgot to note in my
> stats previously that I do *not* use compression on BackupPC: I want my
> backups as simple as possible.)
Yes, in backuppc (not any kind of filesystem-level compression), but when most
of the dataset doesn't change in a night -- is it really relevant?
> I think you might want to start a *LOT* simpler. Get
> rid of a lot of the extra layers, even if temporarily. Start with
> a simple server: 1 SATA drive, 1GB RAM, 1GHz processor and 1 Gb interface.
> See how that performs--I think you will be pleasantly surprised.
Well, I did run this on a system with better specs than that (SATA disks in a
RAID, lots of RAM, faster processor). It worked great with tar but bogged down
terribly on 25GB files with rsync (see the other thread about that). I believe
the problems I'm seeing now, at least for the incrementals, are unrelated.
-- John
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- [BackupPC-users] Really slow with rsync, even on incrementals, John Goerzen
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, Michael Stowe
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, Les Mikesell
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, John Goerzen
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, Les Mikesell
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, John Goerzen
- Re: [BackupPC-users] Really slow with rsync, even on incrementals, Timothy J Massey
Re: [BackupPC-users] Really slow with rsync, even on incrementals, Jeffrey J. Kosowsky
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