Question Nas and pcie 2. 0 x1 to sata vs pcie 3.0 x1

[dovedescent7]

Ive build my own nas an xpenology (synology) and had noticed some slow speeds.
its got 3 different pools all using sata iii ssds
a Raid 0 volume
an SHR volume
and i think another SHR.
short story, the mobo only has 6 6/mbs sata ports built in.
all the rest are using pcie 2.0 to sata 3 cards.
for example 4 sata drives arw on 1 pcie 2.0 card
and 4 sata drives on another pcie 2.0 card.
so today, amazons delivering 2 pcie 3.0 x1 sata III cards one with 10 ports, one with 6.
Should i notice and speed differences considering all my drives are SSD'S?
especially for the raid 0 ssd array?

 

[kanewolf]

Ive build my own nas an xpenology (synology) and had noticed some slow speeds.
its got 3 different pools all using sata iii ssds
a Raid 0 volume
an SHR volume
and i think another SHR.
short story, the mobo only has 6 6/mbs sata ports built in.
all the rest are using pcie 2.0 to sata 3 cards.
for example 4 sata drives arw on 1 pcie 2.0 card
and 4 sata drives on another pcie 2.0 card.
so today, amazons delivering 2 pcie 3.0 x1 sata III cards one with 10 ports, one with 6.
Should i notice and speed differences considering all my drives are SSD'S?
especially for the raid 0 ssd array?

A PCIe 3.0 x1 slot is equivalent to a SATA 6Gb connection (approximately). So 10 SATA ports on a single SATA equivalent connection will provide poor performance.

 

[dovedescent7]

A PCIe 3.0 x1 slot is equivalent to a SATA 6Gb connection (approximately). So 10 SATA ports on a single SATA equivalent connection will provide poor performance.

Ok let me get this straight:
1 PCIe 3.0 x1 using 1 port to one sata ssd maxes out at 550mbps? And if there are 2 sata ports,2 ssds's then each ssd will only get like 225mbps max? Thats crazy?

So whats the best solution to getting more full speed sata ports in your rig? buying like one of those big ass lsci or scsi sas cards or something?

 

[kanewolf]

Ok let me get this straight:
1 PCIe 3.0 x1 using 1 port to one sata ssd maxes out at 550mbps? And if there are 2 sata ports,2 ssds's then each ssd will only get like 225mbps max? Thats crazy?

So whats the best solution to getting more full speed sata ports in your rig? buying like one of those big ass lsci or scsi sas cards or something?

If both of the drives were active, then yes, 225. You could have two drives connected and each could get 550 if the other is idle.
What is the solution? Get a card that isn't an X1. Get an X8 card. Get a card that is a hardware RAID controller on the card, so that the RAID overhead is not handled by the CPU.
Get fewer bigger drives.
You are limited to your network speed on a NAS. No matter how many SSDs you have, gigabit ethernet is limited to 110MB/s.
Do you have 10GE infrastructure to go with this NAS ?