Gary Roach wrote at about 09:02:22 -0700 on Monday, April 8, 2013: > On 04/07/2013 02:26 PM, [email protected] wrote: > > Gary Roach wrote at about 13:43:28 -0700 on Sunday, April 7, 2013: > > > Hi, > > > > > > I am modifying my whole backup system for greater volume and speed. > > The > > > new system is as follows: > > > > > > Software - Backuppc using rsync (without SSH) > > > Server - D865PERL Motherboard > > > Pentium 4 - 2.4 GHz Processor > > > IDE System hard drive > > > SATA, 1 TB WD green backup data storage disk. > > (S/B > > > 1.5 Gb/S) > > > 1GB system memory > > > PCI bus > > > Intel PWLA8391GT PRO/1000 GT PCI Network Adapter > > > Cat 6 cable > > > > > > Clients (2) > > > Intel DP55KG motherboard > > > Intel i5-750 Processor 4 core, 2.66 GHz > > > Hard Drive - Western Digital WD5000AADS -500GB, 32MB > > > Cache, SATAII (3 Gb/s) > > > PCIX bus > > > 2 GB system memory > > > Intel Gigabit CT PCI-E Network Adapter EXPI9301CTBLK > > > Cat 6 Cable > > > > > > I have read all sorts of complaints about this type setup and need > > some > > > advice. > > > > I am not aware of *any* general complaints about any general > > hardware. Complaints if any typically reflect a lack of understanding > > about how BackupPC works or unrealistic expectations of performance > > relative to the size/number of backups on the one hand and network > > bandwidth and to lesser extents CPU speeds and disk setup on the > > other. > > > > That being said, I am puzzled by your statement that you are > > "modifying my whole backup system for greater volume and speed", yet > > your server setup seems to be based on 10 year old technology - > > Pentium 4 2.4GHz (presumably single core), 1GB DRAM, IDE system drive > > and a WD Green (i.e.., exact opposite of a performance) data disk. In > > fact, it would be harder to imagine a *less* suitable hardware setup > > if you are interested in greater volume and speed. > > > > Now this doesn't mean that BackupPC won't run on such a setup -- indeed, my > > home backup server is approaching 10 years and has only slightly > > better hardware (p4 2.8GHz, 2GB DRAM, pair of RAID1 Seagate > > (non-green) 1TB drives). It works fine for me but it is at the low end of > > performance. I get about 5-6 MB/sec max (on a 100bps ethernet). Of > > course, my backup backup server is even lower powered being an 800MHz > > ARM plugcomputer with 512MB DRAM and a USB hard drive... but it's slow. > > > > > It would appear that I should get around 1 Gbit/S transfer rate > > > for continuous data transfer. If this is not true, why not and what > > can > > > I realistically expect. > > > > How would you ever expect to get 1 Gbit/second???? > > > > First, while you mention that your ethernet cards are GigE, you don't > > say anything about your actual network speed being GigE which would > > require a GigE router/switch. > > > > Second, GigE can't even do 1 Gbit/second raw data transfers due to the > > ethernet (and other) protocol overheads plus collisions, etc. Even > > under ideal conditions, one would get a good fraction less than 1 > > Gbit/second. > > > > Third, your old IDE-based motherboard (even with onboard SATA > > adapters) is unlikely to have more than about 150 mbit/sec capacity. > > > > Fourth, while your drive may have a 1.5Gb/sec interface and may in > > burst mode approach such a speed when reading/writing from its buffer, > > there is no way it can do sustained transfers anywhere near that > > speed -- especially Green drives that are optimized for power usage > > and not for performance. > > > > Finally, how do you expect your lowly p4 2.4GHz to keep up with rsync > > at anything approaching 1 Gbit/second let alone any of the overhead of > > BackupPC (and in particular compression). > > > > My guess is that if you don't have a true GigE network (including your > > router/switch), you are unlikely to get more than about 6-8 mbit/sec > > (i.e. .006 - .008 Gbit/sec). If you have a GigE network, maybe you can > > expect to get a little more before your motherboard and cpu are rate > > limiting. > > > > ------------------------------------------------------------------------------ > > Minimize network downtime and maximize team effectiveness. > > Reduce network management and security costs.Learn how to hire > > the most talented Cisco Certified professionals. Visit the > > Employer Resources Portal > > http://www.cisco.com/web/learning/employer_resources/index.html > > _______________________________________________ > > BackupPC-users mailing list > > [email protected] > > List: https://lists.sourceforge.net/lists/listinfo/backuppc-users > > Wiki: http://backuppc.wiki.sourceforge.net > > Project: http://backuppc.sourceforge.net/ > > > Thank you all for you input. > > Some clarification: > The router/switch is being replaced with a Verizon M1424 Gegabit > device. > I plan on increasing the memory on the server. > This is a home system and the real need for the re-do is to get > more storage space. > I don't need a high rel system assuming that all of the computers > are not going to fail at the same time. ( a chance I am willing to take > for cost reduction) > While these are home systems, they still run 24/7 and power > consumption is a consideration. > I have my backups staggered so that full backups happen on > different days. > The amount of file churning is relatively low. > > Above, do you really mean that I could expect transfer rates as low > as 600 to 800 KB/S. I could carry the data in a bucket faster. I don't > have a real good figure for the transfer rates for my present setup but > know they are way faster than that.
I think you could expect 5-10 MB/S on a GigE network (assuming truly GigE) with the rate limiting step being your CPU and the combined limitations of non-RAID, Green drives on an old SATA/IDE motherboard. > > I am getting the idea that putting in a GigE system isn't going to buy > much speed. Any comments? See above... ------------------------------------------------------------------------------ Minimize network downtime and maximize team effectiveness. Reduce network management and security costs.Learn how to hire the most talented Cisco Certified professionals. Visit the Employer Resources Portal http://www.cisco.com/web/learning/employer_resources/index.html _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
