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тАО04-14-2005 07:44 AM
тАО04-14-2005 07:44 AM
MSA 1500 slow performance
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тАО04-14-2005 07:50 AM
тАО04-14-2005 07:50 AM
Re: MSA 1500 slow performance
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тАО04-14-2005 08:08 AM
тАО04-14-2005 08:08 AM
Re: MSA 1500 slow performance
A tape drive can easily achive a steady data stream, because it just have to move forward. A disk has to move its head assembly and then wait until the right sector(s) pass the read head. Combine this with higher seek times on SATA disk drives (the smaller cost has to be _somewhere_) and it should be clear why your performance is that low.
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тАО04-14-2005 09:43 AM
тАО04-14-2005 09:43 AM
Re: MSA 1500 slow performance
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тАО04-14-2005 05:17 PM
тАО04-14-2005 05:17 PM
Re: MSA 1500 slow performance
I would first see if defragmenting the disks can speed up your backup enough (what software are you using?). Again, I don't think anyone can predict how fast it will go after defragmenting, because it depends on so many factors.
The 60 Megabyte/second number on the LTO 460, by the way, assumes that your data is compressable by a 1:2 factor and that you are using Ultirum 2 media. The tape drive can 'slow down' its speed (it's called data rate matching) between 10 and 30 MegaByte/second.
From your numbers it looks like your tape goes into a start/stop mode from time to time. It is also called 'shoe-shining', because the tape must move a bit back and then go forward again, so that it continues writing at the correct tape spot. I think it is obvious that this causes additional wear on the tape drive and media and slows down your backup further.
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тАО04-15-2005 09:08 AM
тАО04-15-2005 09:08 AM