[Kevin OBrien]

Last but not least, we look at the Intel SSD 520 in RAID0, RAID0x3 and RAID5.

Intel SSD 520 RAID Review

[ThinkpadW520-Intel510RaidO]

Kevin OBrien, on 06 February 2012 - 10:31 AM, said:

Last but not least, we look at the Intel SSD 520 in RAID0, RAID0x3 and RAID5.

Intel SSD 520 RAID Review

Excellent review.

Did you get the 50 second warm-boot delay with the Intel 520 SSD in the Lenovo W520 (as is the case with the Lenovo W520 + Intel 510 SSD).

This post has been edited by ThinkpadW520-Intel510RaidO: 06 February 2012 - 03:06 PM

[Kevin OBrien]

ThinkpadW520-Intel510RaidO, on 06 February 2012 - 03:05 PM, said:

Excellent review.

Did you get the 50 second warm-boot delay with the Intel 520 SSD in the Lenovo W520 (as is the case with the Lenovo W520 + Intel 510 SSD).

We haven't noticed that fault on our review unit. We can reclone the drives to put it through some more reboot scenarios if you would like though.

[ThinkpadW520-Intel510RaidO]

Kevin OBrien, on 06 February 2012 - 03:10 PM, said:

We haven't noticed that fault on our review unit. We can reclone the drives to put it through some more reboot scenarios if you would like though.

That would be great if you could test the "warm-reboot" scenario with the Intel 520 SSD in the Lenovo W520.

Lenovo BIOS engineers are aware of the 50 second warm-boot delay issue with the Intel 510 SSD (which occurs both in single drive and RAID setups), but have not been able to fix it yet.

This post has been edited by ThinkpadW520-Intel510RaidO: 06 February 2012 - 03:56 PM

[Kevin OBrien]

That might have been related to the Marvell controller in the 510, which would have been completely different than the SF-2200 controller in the SSD 520.

[MySchizoBuddy]

newbie question what do you mean by queue depth?

This post has been edited by MySchizoBuddy: 23 February 2012 - 07:36 PM

[ThinkpadW520-Intel510RaidO]

MySchizoBuddy, on 23 February 2012 - 07:31 PM, said:

newbie question what do you mean by queue depth?

Yes, I am curious about that too.

queue depth is defined as "outstanding I/O" in Wiki, but I don't quite get how one would know how many outstanding I/Os there are and wouldn't be there fewer outstanding I/Os with a faster SSD?

[Kevin OBrien]

ThinkpadW520-Intel510RaidO, on 23 February 2012 - 07:42 PM, said:

Yes, I am curious about that too.

queue depth is defined as "outstanding I/O" in Wiki, but I don't quite get how one would know how many outstanding I/Os there are and wouldn't be there fewer outstanding I/Os with a faster SSD?

Well that plays into it since a faster SSD can plow through its workload at a greater place. The I/O speed and latency actually play hand in hand when measuring queue depth speeds. Higher queue depth to a certain point the I/O speed will remain the same but the latency will skyrocket.

[ThinkpadW520-Intel510RaidO]

Kevin OBrien, on 06 February 2012 - 04:00 PM, said:

That might have been related to the Marvell controller in the 510, which would have been completely different than the SF-2200 controller in the SSD 520.

The Sandisk Extreme (announced Feb 2012), which uses the SandForce controller http://pcworldpc.blo...-explained.html has the same 40 sec delay issue:

http://forums.lenovo...p/690721#M25106

Therefore the Lenovo W520 40 sec delay does not have anything to do with the SSD controller being used.

Lenovo is aware of the issue (which has been reported 9 months ago), but has not yet fixed it.

[MySchizoBuddy]

do you see a linear increase in performance when going from 2,4,8,16 RAID SSDs. Can you do a benchmark regarding this.