Ssd Raid4

hajsveen · November 14, 2015

First of all. Is RAID4 somethinge to consider at all?

I know linus likes RAID0, and that it is a good storage solution! But is RAID4 smart?

I have 3 ssd's here.

1-Adata sp920 128gb

1-samsung 850evo 1tb

1-samsung somthing 120gb.

Can the 1tb drive be parity drive, and the others storage drives?t

Altecice · November 14, 2015

Your RAID will be limited by the smallest LUN aka your 120Gb so you will end up with 3 120Gb SSD partitions.

scottyseng · November 14, 2015

First of all. Is RAID4 somethinge to consider at all?

I know linus likes RAID0, and that it is a good storage solution! But is RAID4 smart?

I have 3 ssd's here.

1-Adata sp920 128gb

1-samsung 850evo 1tb

1-samsung somthing 120gb.

Can the 1tb drive be parity drive, and the others storage drives?t

I would not do RAID with the drives you have. RAID only uses the smallest drive size, so your 1TB drive would be crippled to 120GB and same for the Adata. If you're doing RAID, you have to have the drives be all of the same size otherwise you're wasting a lot of space.

hajsveen · November 15, 2015

I would not do RAID with the drives you have. RAID only uses the smallest drive size, so your 1TB drive would be crippled to 120GB and same for the Adata. If you're doing RAID, you have to have the drives be all of the same size otherwise you're wasting a lot of space.

I raid useful in any way then?]

leadeater · November 15, 2015

I raid useful in any way then?]

With the combinations of disks you have, not so much. You could raid 0 the 120GB/128GB. The other option is to use windows storage spaces, that will be able to combine them in to a single large disk.

Ultimately what are you actually trying to achieve? If its just purely for performance then using raid on SSD in a desktop won't do this. Few reasons but the 2 biggest ones are 1.) Consumer SSDs are not designed for hardware raid and 2.) The synthetic/theoretical performance gain will not be seen in applications or games.

RAID using the onboard Intel controller is safe, on my X79 chipset I've only got 2 good Intel 6Gb/s ports though.

On the topic of hardware raid using SSD this really is not something you want to do with Samsung. I have 2 840 Pro's and 4 850 Pro's and have tried raid on a IBM M5110 and an LSI 9361-8i + Fast Path with mixed to horrific results. Consumer SSDs do not have enhanced garbage collection and very large flash over provisioning you see in enterprise SSDs, which is why the cost so much more, so not having trim support kills the performance. No hardware RAID has trim support and all consumer SSDs totally rely on it to keep good performance, some more than others.

Samsung 840 Pro's seemed to handle hardware raid slightly better than the newer 850 Pro's.

I currently use windows storage spaces on my 4 850 Pro's to give a 1.84TB single volume. Use an IBM M1015 IT mode for the 4 6Gb/s sata ports.