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тАО02-14-2005 06:01 PM
тАО02-14-2005 06:01 PM
Disk-to-Disk backup slower then disk-to-LTO
Recently I have been implementing disk-to-disk backup solutions in a SAN environment with several customers.
They have an EVA3000 as primary storage, a MSL6030 library with LTO-2 tape drives and a MSA1500Cs with SATA drives (MSA-20 shelves)as backup devices, all SAN attached.
I have noticed that writing a backup from the same server of the same data takes longer to write to the MSA then to the LTO drive. We Use Data Protector as backup software.
Can anybody give me an explanation why this is? Disk-to-disk backup should be faster, no?
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тАО02-14-2005 08:53 PM
тАО02-14-2005 08:53 PM
Re: Disk-to-Disk backup slower then disk-to-LTO
The difference between disk and tape IO performance can be characterised as follows:
Disk - excellent random read & write performance, average sequential read & write performance.
Tape - excellent sequential read & write performance, poor random read & write performance.
So for a backup (which is effectively a sequential write) it's quite possible for a tape (particularly a LTO2) to be faster than disk.
The difference is when you come to restore a file from your backup - now seek times become important and as disk is great at random IO, it has low seek times and can restore the file much quicker than the tape (mainly because it can find the file much quicker than the tape)
HTH
Duncan
I am an HPE Employee
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тАО02-14-2005 09:28 PM
тАО02-14-2005 09:28 PM
Re: Disk-to-Disk backup slower then disk-to-LTO
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тАО02-14-2005 11:08 PM
тАО02-14-2005 11:08 PM
Re: Disk-to-Disk backup slower then disk-to-LTO
Second are you actually writing to a NTFS filesystem on the ATA disks? Again filesystems are not especially designed for sequential IO performance and can slow things down.
HTH
Duncan
I am an HPE Employee
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тАО02-14-2005 11:40 PM
тАО02-14-2005 11:40 PM
Re: Disk-to-Disk backup slower then disk-to-LTO
On the other hand, I completely agree with you that the difference between a tape backup and a disk backup is the file-system (or the lack of it) on the target. Do you think this could influence performance? Now we use NTFS. Could FAT32 speed up things?
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тАО02-15-2005 12:04 AM
тАО02-15-2005 12:04 AM
Re: Disk-to-Disk backup slower then disk-to-LTO
HTH
Duncan
I am an HPE Employee
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тАО02-15-2005 12:52 AM
тАО02-15-2005 12:52 AM
Re: Disk-to-Disk backup slower then disk-to-LTO
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тАО02-15-2005 12:55 AM
тАО02-15-2005 12:55 AM