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тАО12-11-2001 09:01 AM
тАО12-11-2001 09:01 AM
SAN vs Local Disk
- and found that local disk (7200 rpm) r/w a 1 GIG file faster than the SAN.
Did we miss configure something ? Fiber card? Switch? Wait for Fabric?
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тАО12-11-2001 02:00 PM
тАО12-11-2001 02:00 PM
Re: SAN vs Local Disk
What method of recording was done to gather
this information. If you are using sar -d
it will not give an accurate reading because
of the caching in the SAN.
One thing to remember is that fabric is better than loop.
-Michael
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тАО12-11-2001 02:01 PM
тАО12-11-2001 02:01 PM
Re: SAN vs Local Disk
how is the lun where you did the test configured??
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тАО12-12-2001 01:57 AM
тАО12-12-2001 01:57 AM
Re: SAN vs Local Disk
Anything to a file system would most likely be skewed by the buffer cache...
HTH
Duncan
I am an HPE Employee
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тАО12-12-2001 08:04 AM
тАО12-12-2001 08:04 AM
Re: SAN vs Local Disk
With SAN you envolve more devices (switches/bridges).
The advantage of using SAN being more flexibility and growth. If you have more numbers of disks locally attached against going via SAN , SAN might show performance improvement against just single disk.
Thanks.
Prashant.
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тАО12-12-2001 09:10 AM
тАО12-12-2001 09:10 AM
Re: SAN vs Local Disk
2) File system not raw, loop is used right now - fabric later
3) Tests done
write test
timex cat gig1 > /san/gig1
read test
timex cat /san/gig1 > /dev/null
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тАО12-12-2001 03:00 PM
тАО12-12-2001 03:00 PM
Re: SAN vs Local Disk
Other points worth remembering:
- Are you comparing like with like? What are the disks attached via the SAN?
- These tests are only giving you results for sequential reads/writes - many applications do not have this kind of profile anyway.
- If you are on a FCAL loop, then remember you are sharing the 100MB/s bandwidth with other devices on the same loop.
HTH
Duncan
I am an HPE Employee