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тАО11-07-2007 06:22 AM
тАО11-07-2007 06:22 AM
When I do a file copy from one disk to another the best throughput I can get is 36 MB/s.
I am not sure what performance I should expect out of this transfer. I know that the Fibre is capable of 250 MB/s. I expect some overhead from the OS and the file system, but this is a factor of 8.
I have Microsoft MPIO installed with the HP DSM for EVA 8000. I have ALB enabled and am using SQST. What is the benchmark for disk to disk transfers?
Any comments are appreciated.
Thanks,
Solved! Go to Solution.
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тАО11-07-2007 07:34 AM
тАО11-07-2007 07:34 AM
Re: File transfer rates on Windows 2003 and EVA 8000?
I'd recommend you to try iometer for benchmarking SAN performance instead.
Use large blocks (like 128kb), with a fairly large Queue size(like 64), and sequential reads if you want raw sustained performance measurements.
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тАО11-08-2007 02:38 AM
тАО11-08-2007 02:38 AM
Re: File transfer rates on Windows 2003 and EVA 8000?
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тАО11-08-2007 03:47 AM
тАО11-08-2007 03:47 AM
Re: File transfer rates on Windows 2003 and EVA 8000?
What I want to know is a simple thing (I think) What kind of performance should one expect when copying files from one Disk to another Disk? Both disks are on the same server. The server has two HBA's with Active Load Balancing and Microsoft MPIO/HP DSM. The storage is EVA 8000. In this scenario what is an acceptable transfer rate. Everyone seems to agree that 36 MB/s is low. Realistically, what should I be expecting? Can someone out there just do a file copy (I use robocopy with no logging and only the /copy:D option) from disk to disk on a windows files server/eva8000 config and tell me what results they get? I would really appreciate that.
Thanks,
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тАО11-08-2007 04:33 AM
тАО11-08-2007 04:33 AM
Re: File transfer rates on Windows 2003 and EVA 8000?
I seem to have everything configured correctly, such as load-balancing, queue depth, write cache enabled, LUNs balanced across controllers, etc.
PLEASE chime in or post any results you may have. I've been fighting with HP Support on what seems like poor performance.
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тАО11-08-2007 05:24 AM
тАО11-08-2007 05:24 AM
Re: File transfer rates on Windows 2003 and EVA 8000?
A couple of things here:
First make sure you have installed and are using the HP HBA drivers. If not then you WILL have performance issues with those HBA's.
The 10K drives using VRAID5 will a performance issue. If you want create a LUN with VRAID1 and see if the performance is better. You could then look at migrating data from VRAID5 to VRAID1 or splitting it up between the two types of VRAID LUNS.
Phil
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тАО11-08-2007 05:28 AM
тАО11-08-2007 05:28 AM
Re: File transfer rates on Windows 2003 and EVA 8000?
if you make small io size you will get high io per sec, if you make high io size ( 228k 256k ) then throughput will increase. als├Д┬▒ it depens on write/read ratio, if you increase write ratio your througput will increase since your io assumed completed after writing to cache... you should use iometer or similar progras to test io instead of copying large file.
Hasan.
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тАО11-08-2007 07:20 AM
тАО11-08-2007 07:20 AM
Re: File transfer rates on Windows 2003 and EVA 8000?
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тАО11-08-2007 12:41 PM
тАО11-08-2007 12:41 PM
SolutionThe issue is almost always disks. during a copy, you cannot write the data until you read it. So windows requests a block from the eva. If it's in cache - good, if not the eva has to go get it. The eva has to wait for that disk to complete the read before it can return the block to windows. It doesn't matter how many disks are in the eva, if the data is on one disk, that is the disk that must be read. If the windows OS could request 100 different blocks at the same time, the eva could issue 100 reads from 100 disks at the same time and get 100 blocks in the same time as it takes to get 1. But if the window's OS decides to read 1 block and then write 1 block, the speed would be equal to the read rate of a single disk. The eva trys to be smart about guessing which block the OS will ask for next but if the windows OS is jumpping all over the place, that becomes harder.
The only why to figure out what is really going on is to run perfmon and look at the disk I/Os and response times. I'm guessing the writes are taking less than 1 ms but the reads are taking 4 or so ms.
Also look at the number of bytes /read and the number of reads /sec
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тАО01-18-2010 11:30 PM
тАО01-18-2010 11:30 PM
Re: File transfer rates on Windows 2003 and EVA 8000?
Have you found out what caused your low read throughput? i seem to be experiencing the same problem w/ my newly upgraded eva6100 to xcs6.220. xcs 611o had a known issue w/ respect to its read cache. after my upgrade, my linux machines' read throughput tripled. But my win 2k3 sp2 servers' read throughput halved. I'm thinking i'ts a compatibility issue w/ the hba driver or hp dsm being used.
cheers!