kingneutron Posted August 8, 2012 Share Posted August 8, 2012 Hello; 1st thing I did after opening the box, was plug this drive into a Freebsd-64 system for some I/O testing. Real-world Write speed on the raw, unformatted SSD was about where Tom's HW said it would be - about 100MB/sec. Read speed was atrocious - reading the 1st 1GB of the drive using DD took 81-82 Seconds, or ~12.7 MB/sec. :mad: The tests that I ran are the same ones I use on spinning-disk drives, as such: (using bash shell) # Write test: 3 runs time (dd if=/dev/zero of=/dev/ada3 bs=1M count=1000;sync) Run1: 0m10sec Run2: 0m10.5sec Run3: 0m9.97sec # Read test: 2 runs time (dd if=/ada3 bs=1M count=1000;sync) Run1: 1m21sec Run2: 1m22sec --- At this point, I removed the drive and put it in a Windows 7--64 machine. Formatted the drive as NTFS, Quick format, default settings. I ran Invirtus Freespace on it (writes zeros till drive is full) and got ~87MB/sec consistently - which while not horrible, is still slower than what I would expect from a drive that is advertised as being capable of writing over 200MB/sec. http://www.corsair.com/us/ssd/nova-series-ssd.html This is hardly what I would call a "quantum leap" over my existing spinning disks. :evil: Anyhow, then I copied a couple of directories that were ~8GB to the drive, using Win7's Explorer, one at a time - the copy (Detailed view) actually *stopped* both times for almost a minute, and then resumed at ~25-30MB/sec. Needless to say, I don't think I can use this (my first SSD drive) for the use I was intending - as an unformatted cache drive for my ZFS raid. The existing 6x500GB RAIDZ2 *without* the SSD cache drive is capable of writing 1GB to ZFS using the above DD method in ~10 seconds, and reading ~7.8GB in 43-46 seconds. :D: Update: the 3rd folder copy of ~7.83GB on Win7--64 did -not- stop entirely; the copy started out ~127MB/sec, which is consistent with the amount of cache on the drive - and then started slowing down significantly as the copy progressed, with the slowest speed going all the way down to 48.5MB/sec. My question is, ATTO benchmarked** the drive as being "normal" - but real-world data I/O is much slower than expected. ** Benchmark settings: Transfer size: 512 - 8192 KB Total length: 1GB v/ Force Write access v/ Direct I/O v/ Overlapped I/O Queue depth: 4 ** Benchmark results: 512.0 - Write: 228447 / Read: 295548 1024 - W: 226474 / R: 261888 2048 - W: 225103 / R: 262528 4096 - W: 224632 / R: 261888 8192 - W: 224632 / R: 260616 --- Freebsd detected the drive as " Corsair Nova 2 SSD 5.02 " -- should I RMA the drive? I'm pretty disappointed with it so far. :confused: Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted August 8, 2012 Corsair Employee Share Posted August 8, 2012 I am sorry but you will need to use Parted Magic and secure erase the drive, writing one's or zeros to the drive will degrade performance. Then quick format in Windows 7 and run ATTO. And CENTOS 6.X has a benchmark that is fairly accurate and detects and works well with SSD's Link to comment Share on other sites More sharing options...
kingneutron Posted August 9, 2012 Author Share Posted August 9, 2012 Thanks for the advice, RG - will try that. :sunglasse Link to comment Share on other sites More sharing options...
kingneutron Posted August 9, 2012 Author Share Posted August 9, 2012 Done; I'll have to test it later. # DL link: http://distrowatch.com/table.php?distribution=partedmagic # HOWTO link that I followed, for anyone that needs it: http://www.overclock.net/t/1227597/how-to-secure-erase-your-solid-state-drive-ssd-with-parted-magic Link to comment Share on other sites More sharing options...
kingneutron Posted August 12, 2012 Author Share Posted August 12, 2012 Thanks for your help; I got the SSD erased/reset and added it as a ZIL log to my ZFS RAIDZ2. It's running fine now :D: *** FYI: To save someone else from the same mistake I made: When adding an SSD to an existing RAIDZ2, **DON'T** use the -f flag to force it on while using the wrong syntax! I had to backup the pool and recreate it in order to drop the SSD and re-integrate it properly. BAD: pool: tank1 state: ONLINE scan: scrub repaired 0 in 2h1m with 0 errors on Tue Jul 31 23:22:25 2012 config: NAME STATE READ WRITE CKSUM - tank1 ONLINE 0 0 0 -- raidz2-0 ONLINE 0 0 0 --- label/zdisk1 ONLINE 0 0 0 --- label/zdisk2 ONLINE 0 0 0 --- label/zdisk3 ONLINE 0 0 0 --- label/zdisk4 ONLINE 0 0 0 --- label/zdisk5 ONLINE 0 0 0 --- label/zdisk6 ONLINE 0 0 0 -- label/ZILtank1 ONLINE 0 0 0 (!!!!!!) -- zpool destroy tank1 zpool create tank1 raidz2 label/zdisk{1..6} -- GOOD: zpool add tank1 log label/ZILtank1 pool: tank1 state: ONLINE scan: none requested config: NAME STATE READ WRITE CKSUM - tank1 ONLINE 0 0 0 -- raidz2-0 ONLINE 0 0 0 --- label/zdisk1 ONLINE 0 0 0 --- label/zdisk2 ONLINE 0 0 0 --- label/zdisk3 ONLINE 0 0 0 --- label/zdisk4 ONLINE 0 0 0 --- label/zdisk5 ONLINE 0 0 0 --- label/zdisk6 ONLINE 0 0 0 -- logs --- label/ZILtank1 ONLINE 0 0 0 errors: No known data errors --- zfs set atime=off tank1 Link to comment Share on other sites More sharing options...
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