I wanted to get a sense for how quickly the full Volume back ups are taking for folks here. When you look at your logs and take the total backed up and divide by the time to complete a full Volume back up, what types of rates do you see for your machines?
On some machines, the averageis more like 5 MB/s to 6 MB/s. We do have some machines that havelower averages, in the 2 MB/s to 4 MB/s range, which poses a problem when back up windows are considered.
Does anyone here see substantially faster back up times with their back up jobs? The concern is if you have a customer with 30 machines who want BU/DR, and it's time to do full back ups, you may not have enough of a back up window to complete the full back ups.
Has anyone run into this? If you do see faster back up times, what type of configuration do you have that got you to this speed?
Thanks in advance.
You definitly are having a problem. We see speeds from 12MB (Megabytes) per seconds to 70MB/sec. 12MB would be for 100MB NICs on slower hardware. 70MB/sec would be on Quality Class server hardware with RAID etc.
Do this, do a test backup from one server to the other WITHOUT the DAS. I suspect the DAS.
far182 wrote: Do this, do a test backup from one server to the other WITHOUT the DAS. I suspect the DAS.
You were correct. I only have one night of full backups to compare, but when I switched the image location to go to a server with a SCSI RAID 5 drive instead of to a server with a DAS (Dell AX100 with fiber channel and SATA drives in RAID 5), the back up time dropped.
The full backup on one serverlast night ran at 9.23 MB/s instead of 6.39 MB/s that the pervious full backup took going to the server with DAS.
On another server, it ran at 11.0 MB/s instead of 5.03 MB/s that the previous full backup took going to the server with DAS.
I suppose the SATA drives on the DAS really can't outperform the SCSI drives connected internally to a server. Ineresting.
So, another question, when you do BU/DR for your customers, what kind of hardware do you send your image files to? I know it depends on a number of factors, such as number of machines and amount of data to back up, but do you standardize on a storage server for images?
Thanks for your help!
We like to use NAS servers for storage.
far182 is right, there are many variables here to consider: number of drives in a RAID volume,drive speeds,NIC types, frame type, type of server hosting the DAS (isn't AX100 technically a SAN? It handles I/O processing internally and can be accessed by multiple hosts), how busy the storage system is at the time of the backup (AX100 might be utilized by multiple servers). Also RAID 5 is not the best choice for write-intensive activity since parity has to be calculated and written in addition to data (lots of overhead I/O).
Realistically, as far as the storage system is concerned, with no concurrent activity 11mb/s should not be a bottleneck for any modern SATA hard disk, let alonean arraylike an AX100. Your bottleneck is probably the network or the server hosting the SAN.