Princy Posted December 1, 2009 Share Posted December 1, 2009 Hi I have two X32's set up in raid 0 and am experiencing some unexpectedly relatively poor performance from the o.s. partition on the array. I have the drives split into a 25Gb o.s partition and a 34.6Gb partition for installed software to run from. I created the array using 128k stripe but can't for the life of me manage to find a method or piece of software to allow me to choose the allocation size for the format as all of the software I have found either doesn't see the array or doesn't allow me to set the allocation size. Thanks in advance for any help as I want to rule out any setup issues before going down the rma route. Link to comment Share on other sites More sharing options...
NfiniteZERO Posted December 1, 2009 Share Posted December 1, 2009 The best way to set up for a RAID 0 is when doing a clean install. I can definately help you out here. I advise against (very much) using alternate programs as converting the clusters with a current install will lead to a lot of filesystem errors that will have to be repaired. I would also advise against multiple partitions with SSDs in RAID0. Doing this with normal HDDs was for performance advantages (aka shortstroking) and would be overkill with SSDs. With the stripe at 128k, you want to use a 32k allocation unit (aka cluster size). To do this properly, you will have to create a small partition with the default allocation of 4k for the Windows bootloader. If you are using Win 7, you can use the System Reserved to run the bootloader. Fire up your Windows install and partition your drives like so: [100MB*] [Remainder of the drive] * Win7 System Reserved default size For Vista/Win7, when you get to where you tell Windows where to install, hit Shift+F10 to open a command prompt. Type "diskpart" (no quotes) and hit enter. Type the commands in as follows. >list disk (Find your RAID - make sure you install your drivers first :idea:) >sel disk # (#=number for your disk. More than likely it will be 0) >list partition (you should see both partitions made) >sel partition 1 (Win7 Sys Reserve/partition you created) >active (tells BIOS "look here for bootloader" - very important) >format FS=NTFS UNIT=4k QUICK OVERRIDE (only if using Vista. Disregard if Win7 created the partition) >sel partition 2 (now to the partition where Windows will actually go) >Format FS=NTFS UNIT=32k QUICK OVERRIDE (This will get your customized cluster size) >assign (mounts the drive to a letter for the next step >exit When you get back to the command prompt, run chkdsk and make sure it reports back 32k clusters. Lastly, proceed with install. Let me know if it works. Link to comment Share on other sites More sharing options...
Princy Posted December 1, 2009 Author Share Posted December 1, 2009 Thanks for the quick reply nfinite, the reason for the partitions is to keep the size of the o.s. partition backup as low as possible, Am I right in assuming that this shouldn't impact on performance anyway? Have followed your instructions and there is an increase in performance yet still not where I'd expected them to perform, the read is good but write performance seems low. Also, seems strange that the write performance is higher in the lower range of the benchmark. http://i297.photobucket.com/albums/mm215/carlprince/Capture.png Link to comment Share on other sites More sharing options...
NfiniteZERO Posted December 1, 2009 Share Posted December 1, 2009 Good to hear. Sadly, your image link is borked so I can't see your benchmarks :( How bad is your write performance? Link to comment Share on other sites More sharing options...
Princy Posted December 2, 2009 Author Share Posted December 2, 2009 Changed the upload of the image so will try that. http://i297.photobucket.com/albums/mm215/carlprince/Capture1.jpg These are the best I can get out of them which is a little surprising and dissappointing :(: Link to comment Share on other sites More sharing options...
Princy Posted December 3, 2009 Author Share Posted December 3, 2009 Right, I think I've found the root of the problem, my o.s. partition (Windows 7), even after being quick formatted with 64k allocation size reverts to 4k allocation size once windows is installed. I am now trying to find a way of converting this back to 64k as none of the software I have or found "see's" my raid array to allow me to do this. Does anyone else have the same problem? Link to comment Share on other sites More sharing options...
NfiniteZERO Posted December 3, 2009 Share Posted December 3, 2009 When you reinstalled Windows, did you have no partitions on the drive? If you have partitions on it already, it won't create the System Reserved partition when you go through the install. The instructions I posted are what I used with my Caviar Blacks in RAID. I did have to run a full format for it to take but it's important to do with normal HDDs, espcially brand new. (100MB Sys Reserve, NTFS 4k, Active) (1.8TB NTFS 32k) For obvious reasons, DO NOT FULL FORMAT THE SSD. Do a secure erase with GParted or HDDErase on both drives, put them back into RAID, install again and follow those instructions and you should be solid. I will not recommend 3rd party tools to resize the drive, as they will cause errors and your system will not be able to boot. Quick note - when you get the the screen asking where you want Windows to get installed, partition the drive there so it will create the System Reserved, then proceed to the command prompt and follow those instructions I posted. Link to comment Share on other sites More sharing options...
Princy Posted December 3, 2009 Author Share Posted December 3, 2009 Thanks again for your help nfinite. Right, deleted the array and used gparted to initiate the internal secure erase command on both drives, got Windows 7 installed as per your instructions with 4k allocation 100mb boot partition, balance of drives 32k allocation, read speed is a little slow in the lower range but picks up nicely in the bottom half of the ATTO bench. The write however is still way below what I would expect from these drives in raid 0, anyone have any suggestions or do I have 1 or 2 faulty drives? Link to comment Share on other sites More sharing options...
NfiniteZERO Posted December 4, 2009 Share Posted December 4, 2009 Glad to hear you got it up and running! Think you can post a quick bench of the SSDs as they are now so I can see where you're at? Link to comment Share on other sites More sharing options...
Princy Posted December 4, 2009 Author Share Posted December 4, 2009 My write speeds were still way down on what I expected so I backed up the then deleted the array, set my controller to ahci and using gparted wiped both drives with the internal secure erase command. I've then changed both sata cables for two brand new sata II cables and done a fresh install of Windows 7 to a partition on my spinning drive. Then tested both x32 ssd as individual drives in ahci mode against one of the other partitions on my spinning drive, results below. http://i297.photobucket.com/albums/mm215/carlprince/Capture2.png The one on the left and the one in the middle are the x32's, the one on the right is the spinning partition. To say I'm dissappointed with the write speeds being slower than my spinning drive right across the test range is a bit of an understatement, and suggestions anyone?? :(: Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted December 4, 2009 Corsair Employee Share Posted December 4, 2009 The X32 SSD Drives performance is about right on track with what we posted 210 MB/s sequential read 100 MB/s sequential write so that is about normal. I am not sure what you are expecting. Link to comment Share on other sites More sharing options...
Wired Posted December 4, 2009 Share Posted December 4, 2009 He's using RAID 0. Link to comment Share on other sites More sharing options...
NfiniteZERO Posted December 4, 2009 Share Posted December 4, 2009 Yeah, RAID 0 should be pulling better numbers than that. Especially with a clean drive. I've got a hunch it might be the RAID controller itself. I'll try to do some legwork this weekend when I can. Princy, I'd recommend you do the same when you get the chance. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted December 4, 2009 Corsair Employee Share Posted December 4, 2009 The test results he posted for for individual drives and they are performing properly according to the screen shots he posted. Post an ATTO Screen shot of the raid array? Also how are you setting the Raid? Should be 128K Cluster size for the Raid and 32k Allocation for the format. I've then changed both sata cables for two brand new sata II cables and done a fresh install of Windows 7 to a partition on my spinning drive. Then tested both x32 ssd as individual drives in ahci mode against one of the other partitions on my spinning drive, results below. Link to comment Share on other sites More sharing options...
Princy Posted December 4, 2009 Author Share Posted December 4, 2009 Sorry for creating confusion, it would appear that there is some disparity in the way retailers are advertising your products, they seem to be copying and pasting the specs related to the drives directly from your product overview quoting figures up to 240mb sequential read 170mb sequential write rather than listing the performance figures relating to the specific drive. It's not the end of the world as the real world performance is still very good, I was just expecting to achieve somewhere near the figures quoted by the retailer in synthetic benchmark (for what that's worth). That'll teach me to research the product before taking the plunge :o: Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted December 4, 2009 Corsair Employee Share Posted December 4, 2009 NP and the SSD's will still have much better read performance and the access time is still much less than a spinning HDD. I would suggest you use the spinning HDD for the swap file though and install the O.S. on the SSD for best over all performance. Link to comment Share on other sites More sharing options...
NfiniteZERO Posted December 4, 2009 Share Posted December 4, 2009 Good catch Ram Guy. Didn't even notice that those were the individual drives, not in RAID. Man, I need more coffee... Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted December 4, 2009 Corsair Employee Share Posted December 4, 2009 No worries and thank you by the way for helping out here I do need all the help I can get sometimes. Link to comment Share on other sites More sharing options...
Princy Posted December 4, 2009 Author Share Posted December 4, 2009 Right, wiped the drives and set them back up in a single array 128k stripe with 32k allocation size and these are the results, pretty much consistent with the information you've given me, I won't be sending them back but will drop them an email outlining their less than accurate description. http://i297.photobucket.com/albums/mm215/carlprince/fullpartraid.jpg Thanks all for your help ;): Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted December 4, 2009 Corsair Employee Share Posted December 4, 2009 NP and you can get the spec for the drives from our web site Under the resources Tab in the future sorry if I sound smug but in case someone else reads this. I am sure the reseller just did not see that the performance was different for smaller drives and maybe only posted the spec for the X256 which is faster. Sorry about that we do try to police resellers but honestly its hard just trying to keep up with my self and what I am responsible for. I am fairly sure it was an honest mistake on their part and please let me know if they do not correct it who they are and what not I will sick our Sales manager after them. Link to comment Share on other sites More sharing options...
Princy Posted December 4, 2009 Author Share Posted December 4, 2009 No worries, I bought the drives from two different resellers (stock issues). 1st was from Adam Carpenter (Uk), item link :- http://www.adamcarpenter.co.uk/corsair-extreme-series-32gb-sata-ii-solid-state-drive.html the 2nd drive was from Dabs.com (Uk), item link :- http://www.dabs.com/products/corsair-memory-32gb-2-5-ssd-sata-300-64mb-64HY.html Thanks again for all your help ;): Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted December 5, 2009 Corsair Employee Share Posted December 5, 2009 NP Please let me know if you have any more questions. Link to comment Share on other sites More sharing options...
NfiniteZERO Posted December 5, 2009 Share Posted December 5, 2009 Now those are some nice numbers Princy! :D Glad to see everything worked out for you. RAM GUY, glad to hear you're feeling better and I'm just happy to help out where I can Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted December 9, 2009 Corsair Employee Share Posted December 9, 2009 NP thanks again I do send gifts out to helpers from time to time. So please do help out all you can. Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.