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How is SSD performance with SATA 2 and without AHCI? - Page 5

post #41 of 48
Quote:
Originally Posted by Unit Igor View Post

Yes,just like rui-no-onna told you ignore it and buy Samsung Evo 250GB or Samsung 840 Pro if you need only 128GB.Dont buy SSDH because its not SSD and its not HDD so what it is,NOTHING!
I bet they are reliable like donkeys.
New rig will come one day.

It is called hybride drive and WD drives are always very reliable drives , in the first generation hybride they used Intel SLC flash and now they are working with Sandisk. .But the prioriy i think with WD is safe datastorage . Never has a WD drive failed on me , and only one bad sector in a raptor sata1 thumb.gif
post #42 of 48
Quote:
Originally Posted by Fred B View Post

It is called hybride drive and WD drives are always very reliable drives , in the first generation hybride they used Intel SLC flash and now they are working with Sandisk. .But the prioriy i think with WD is safe datastorage . Never has a WD drive failed on me , and only one bad sector in a raptor sata1 thumb.gif

I don't believe WD has released any hybrid drives just yet. So far, only consumer SSHD's I've seen so far are from Seagate. As for reliability, that's just a sense of false security. The key to safe data storage is redundancy.
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post #43 of 48
Quote:
Originally Posted by rui-no-onna View Post

I don't believe WD has released any hybrid drives just yet. So far, only consumer SSHD's I've seen so far are from Seagate. As for reliability, that's just a sense of false security. The key to safe data storage is redundancy.

You are wricht with seagate , but they both make very good drives and seagate make awsome 15000 rpm disks .Believe i once had a 3.2 GB seagate not a 15000 rpm , they where with scsi and expensive disk tongue.gif
.


Afcourse redundancy thumb.gif
post #44 of 48
Quote:
Originally Posted by Fred B View Post

It shows when boot from ssd or hd , the hd uses easy qd 10 and the ssd mostly 1 and a few 2/3 . The ssd is fast enough to answer a reqeust , while for hd it is a complet diferent story . When running in ide mode you could spread the load between two ssd/hd and have advantages of multiple iq request .

This is the end of the boot for xp when it reaches qd 3 , but it is a little piece on the end of the boot that uses for ms the higher qeue dept .
The iq time becomes faster when using ssd raid but that does not show in faster boottimes , so it think the os is a real bottleneck smile.gif

G2 -V40




The same end of the boot from fragmented hd , it is random and the iq time is terrible but hits qd10 tongue.gif

WD 1200

Thanks for posting these tables! Nice example of queue depth, booting Windows is a situation even with SSDs, where it is easier to see how it works. Loading a complex game would likely show a queue depth (QD) above one with a SSD.

Any idea what recorded that data? Was that a feature in XP that we no longer have in Windows 7, etc? Interesting to see this with XP, since boards/SATA controllers and drivers in those days did not have AHCI capability, nor does XP have a native AHCI driver. Must have been later on in the XP SP3 time.

Also an example of the superiority of SSDs over HDDs, the SSD is so fast at some points the QD is zero, which means on that system the SSD actually had nothing to do while the CPU was working, I'm surprised. Plus the SSD is a 40GB Intel G2 SATA II SSD, a decent but hardly high performance SSD by today's standards.

I'd love to see similar data for booting Windows 7 and 8, which are larger than XP and likely have more services, etc, starting during boot. I wonder if the "IO Size" shown in the data, all relatively small files, is similar with Windows 7 and 8? Also note there are writes occurring during boot, not a surprise but sometimes forgotten. The tables are not showing the same point in the boot process, so my comments may not be entirely valid, I'd love to see all the data.

It is hard to argue that AHCI/NCQ is extremely important all the time for SSDs used in a single user PC environment, given the QD we see here. But I see no reason to go back to only single I/O requests being sent to a drive, unnecessary and just plain primitive.

If someone does not want to use AHCI with their SSDs, go for it. Personally, I'll keep it.
post #45 of 48
Quote:
Originally Posted by rui-no-onna View Post

I don't believe WD has released any hybrid drives just yet. So far, only consumer SSHD's I've seen so far are from Seagate. As for reliability, that's just a sense of false security. The key to safe data storage is redundancy.

I agree about WD and SSHDs, but they seem to have one coming soon:

http://www.computerworld.com/s/article/9239061/Western_Digital_and_SanDisk_deliver_their_first_hybrid_drive

None seem available now, and I've read both that they were being shipped to OEMs, and delayed until late 2013 or 2014.
post #46 of 48
Quote:
Originally Posted by parsec View Post

Any idea what recorded that data? Was that a feature in XP that we no longer have in Windows 7, etc? Interesting to see this with XP, since boards/SATA controllers and drivers in those days did not have AHCI capability, nor does XP have a native AHCI driver. Must have been later on in the XP SP3 time.
.


The program is called Bootvis made by MS for XP in 2001 , been using this prog for some time now but with ssd it gets another dimension to trace al kind of things. But there is the Windows Performance Toolkit for w7 mayby that works like bootvis ,i never tryed it smile.gif

http://msdn.microsoft.com/en-us/performance/default.aspx
post #47 of 48
Quote:
Originally Posted by Fred B View Post

The program is called Bootvis made by MS for XP in 2001 , been using this prog for some time now but with ssd it gets another dimension to trace al kind of things. But there is the Windows Performance Toolkit for w7 mayby that works like bootvis ,i never tryed it smile.gif

http://msdn.microsoft.com/en-us/performance/default.aspx

Thanks for the reply. I assume Bootvis only works for XP? Figures, a great tool like that, almost a benchmark-like program, imagine running that while booting with various SSDs and SATA controllers with various drivers and configurations, and comparing the results.

I've been meaning to play with Windows ADK but never have...
post #48 of 48
Quote:
Originally Posted by parsec View Post

Thanks for the reply. I assume Bootvis only works for XP? Figures, a great tool like that, almost a benchmark-like program, imagine running that while booting with various SSDs and SATA controllers with various drivers and configurations, and comparing the results.

I've been meaning to play with Windows ADK but never have...

Yes it is only XP ,, and don t get me wrong i like W7 also alot , but i got outdated software that runs good on XP .

But it is a cool tool to use instead of benchmarks , it is easy to setup a second XP drive for this reason , the driver support for xp is stil there smile.gif
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