[wellylug] preliminary SATA Linux software RAID0/RAID1 comparison

[Wood Brent]

--- sam at plaz.net.nz wrote:

> Quoting Wood Brent <pcreso at pcreso.com>:
> 
> > I have run bonnie++ but can't see how to test specific partitions with it.
> > As I don't know which partitions it is using, I'm not including the results
> > here.
> 
> Bonnie++ tests a filesystem rather than a partition, so you also get affected
> by any overheads caused by the filesystem of the drive you're testing.

That's why it is a much more useful test for my purposes :-) I'll be surprised
if the software RAID1 read performance is comparable to RAID0, though, but
'twould be nice. Last time I seriously looked at such things was way back with
kernel 2.2 and I also looked at dual cpu. Major performance issues back
then....

> 
> The parameter give to the -d (scratch dir) option is the directory beneath
> which bonnie++ should create the files it uses for testing.

Gotcha.... perfect! thanks....

> 
> The total size (-s) should be at least equal to your total ram (if not more)
> to ensure that you don't end up testing Linux's disk cache rather than the 
> disk read speed.
> 
> Hope this helps,

It does indeed, appreciated.... 

Brent