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SSDs and benchmarking

H

Hopper642

Member
I have 2 Intel 520s in RAID 0. I am using both crystaldiscmark and ATTO Disk bench mark for benching this RAID array. I have noticed variability in the read speeds especially in crystaldiscmark. There may be as much as 200MB/sec difference in the read speeds from day to day. Is this significant? Is the variability from day to day normal? Thanks.
 
Thanks. I am sometimes getting 1gig/sec read speed in crystaldiscmark and the next day it will be 820MB/sec. ?? Don't know what to think. Appreciate your help.
 
I have also noticed Acronis telling me that there is an error on one of the discs when I perform a backup, but since reenabling system indexing, windows does not give me the same error as it did before. I wonder if there's an issue with one of the drives?
 
Hopper642 said:
I have 2 Intel 520s in RAID 0. I am using both crystaldiscmark and ATTO Disk bench mark for benching this RAID array. I have noticed variability in the read speeds especially in crystaldiscmark. There may be as much as 200MB/sec difference in the read speeds from day to day. Is this significant? Is the variability from day to day normal? Thanks.
Click to expand...

Typically Trim would even out performance from day to day. But since you are running RAID 0- Trim doesn't work. Without that you have to rely completely on the drives GC to do its job and even out performance. Even with good GC's it is said that you typically can't get back to first day performance without a drive wipe. So that said you seem to be staying pretty close to max and then having it drop down every once in a while. Since you say its rebounding then chances are you should be fine, just something to keep in mind in the future.
 
speed variance's can ocurr from:

background activity during the benchmarks
current state of the fresh block reserve
type of data written to the drive(such as random/incompressible data)
various processor and subsystem throttling associated with power mgmt in CMOS, Windows, and the SSD itself.

Some tweaks to aid stabilty and consistency:

disable all c-states
disable EIST(speedstep)
set W7 power options to "high-performance" and to never shut the drive down
reduce system utility bloat and reduce the amount of startup services

there are other things.. but them's the basics.
 
groberts101 said:
speed variance's can ocurr from:

background activity during the benchmarks
current state of the fresh block reserve
type of data written to the drive(such as random/incompressible data)
various processor and subsystem throttling associated with power mgmt in CMOS, Windows, and the SSD itself.

Some tweaks to aid stabilty and consistency:

disable all c-states
disable EIST(speedstep)
set W7 power options to "high-performance" and to never shut the drive down
reduce system utility bloat and reduce the amount of startup services

there are other things.. but them's the basics.
Click to expand...

Thanks again for the help in this thread too. I will make the necessary adjustments.
 
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