ZFS makes SSDs faster than memory!

[Ivan Voras]

On 07/23/10 12:28, Attila Nagy wrote:
> Hi,
> 
> I've came across a strange issue. On a file server (ftp/http/rsync)
> there is a dual SSD based L2ARC configured for a pool of 24 disks:

> fetch -o /dev/null -4
> http://ftp.fsn.hu/pub/CDROM-Images/opensolaris/osol-0906-106a-ai-sparc.iso
> /dev/null                                     100% of  493 MB   11 MBps

If I understand your setup and your benchmark correctly, you are saying
you have achieved 11 megabytes / s performance out of a volume of 24
RAIDZ2 drives split into two parts (so it's like RAID 60). Doesn't this
number seem extremely low to you, considering that (if recent models)
each of your drives can probably pull at least 70 MB/s?