Shaklee39

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About Shaklee39

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  1. These are Intel SSDSC2BB120G4, and it's letting fio run to completion on a 10GB file (test.file above), which is about 5 minutes.
  2. Hi, I have a Xeon server with 3 Intel SSDs connected to a RAID controller with RAID disabled (basically acting as a buffer). I've tried testing the throughput using the fio utility with the following settings where X on numjobs I vary from 1, 2, and 4: [global] blocksize=8K rw=randwrite fsync=1000 numjobs=X [test1] filename=/disk1/test.file [test2] filename=/disk2/test.file [test3] filename=/disk3/test.file When I run this test with numjobs=1 (1 thread/disk), I see throughput of 120MB/s to each disk. However, when I use 2 and 4 threads, the throughput of 2 of the disks drop to 100 and 90MB/s while the first disk always stays at 120MB/s. Nothing else is running on this machine that is using up the disks or CPU that I can see. I will have an application on this machine where multiple cores write to the same disk since they'll be CPU-bound, but these results are not encouraging. Does anyone have a suggestion on what I can do to improve the results or possibly run different tests?
  3. I believe the database I'm using does zlib compression, so I'll try that out first. Thanks.
  4. Thanks so much. Let me absorb your posts a little bit and let me know if more questions . To your first point, the steady state of the system is always about 95% full with erases continuously going in the background dumping old data. If you think that's cutting it close, we can do ssd
  5. Hi, I'm trying to get an answer for something that I've tried asking the manufacturer, but it's hard to get a good idea. I'm looking to buy a server like the 6048R that has 60 spinning disks in a RAID 5 or 10 configuration. The application is a time-series database doing constant sequential writes, and infrequent bursty reads. I would estimate it's about 99% writes and 1% reads. The data I'm looking to write out will probably be around 1-1.5GB/s. The stripe size can be as large as possible since latency is not an issue at all, but performance is. My question is can a server in that configuration keep up with that write rate, and periodic reads using spinning disks, or would I have to use SSDs? With the research I've done I believe it's possible since I've seen the LSI 3108 controller it comes with can do 4-5GB/s in benchmarks. I read some posts by funkywizard a while ago that makes me think it's possible, but confirmation would be nice. On a different note, can someone explain what this RAID card means by 8 channels at 12Gbps each? Does that mean for a system with 60 drives it would have 7-8 disks on each channel? From an OS perspective, does this look like 8 drives, or does it abstract to 1 and the controller load balances? Thanks!