Block I/O Traces
Block I/O Traces typically include block level (e.g., at the logical volume manager, disk driver, etc. level) and block protocol (e.g., SCSI, ATA, Fibre Channel) traces.
WARNING: These traces are over 10 years old! They should not be used for modern research!
The following traces are free to download under the terms of the
SNIA Trace Data Files Download License.
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download traces.
For questions about downloading using a shell script,
see Using Shell Scripts,
and for more information about downloading using a Windows
batch script, see
Using Batch Scripts.
| Trace Name | Details | Details | Actions | |||||
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| FIU Traces | Traces collected at FIU. | Traces collected at FIU. | These traces can be decoded using blkparse. This utility is available on all standard Linux systems. | 2008 - 2009 | 3 months | 475 Million | 28.8 GB |
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| Microsoft Production Server Traces | Because of the size of the traces, the BuildServer traces have been repackaged by IOTTA into eight zip files. The first seven files are divided into one for each of the first seven timestamped hours in the original traces. The last file contains traces of the remaining 18 traced hours, in which the activity was much lighter. All eight zip files contain the same Readme.* and Disclaimer files. They are designed so that if all are unpacked in the same directory, the original trace collection will be recreated. | Traces of several production servers at Microsoft, as described in the IEEE International Symposium on Workload Characterization, 2008. | 2007 - 2008 | 4 months | 1 Billion | 18.2 GB |
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| Microsoft Enterprise Traces | Traces collected at Microsoft using the event tracing for Windows framework. | Traces collected at Microsoft using the event tracing for Windows framework. | 2007 - 2008 | 4 months | 2.6 Billion | 25.1 GB |
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| MSR Cambridge Traces | 1-week block I/O traces of enterprise servers at Microsoft Research Cambridge. The citation for the MSRC traces can be found here. | 1-week block I/O traces of enterprise servers at Microsoft | 2007 | 8 days | 434 Million | 4.94 GB |
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| Cello 1999 | Disk traces taken from the cello server at HP labs in January through December of 1999. | 1999 traces of Cello server at HP labs. |
Software to process the SRT trace format can be downloaded from the tools section of this website. |
1999 - 2000 | 12 months | 30.7 GB |
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| SPC OLTP Application Traces | Two I/O traces from OLTP applications running at two large financial institutions. Due to access restrictions, these traces are hosted externaly. | Two I/O traces from OLTP applications running at two large financial institutions. | 1999 | 1 day | 0 Bytes |
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| SPC Search Engine Traces | Three I/O traces from a popular search engine. Due to access restrictions, these traces are hosted externally. | Three I/O traces from a popular search engine. | 1999 | 1 day | 0 Bytes |
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| Cello 1996 | Disk traces take from the cello server at HP labs in September through November of 1996. | 1996 traces of Cello server at HP labs |
Software to process the SRT trace format can be downloaded from the tools section of this website. |
1996 | 3 months | 4.94 GB |
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| Cello 1992 | Disk traces taken from the cello server at HP labs in April through June of 1992. | 1992 traces of Cello server at HP labs |
Software to process the SRT trace format can be downloaded from the tools section of this website. |
1992 | 2 months | 603 MB |
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| HP LAJW | OS version: HP-UX A.08.00 U Machine type: 9000/845 | Data from the paper "UNIX disk access patterns" by Chris Ruemmler and John Wilkes |
Software to process the SRT trace format can be downloaded from the tools section of this website. |
1992 | 2 months | 8.08 MB |
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| Cello 1991 | Disk traces taken from the cello server at HP labs in March through June of 1991. | 1991 traces of Cello server at HP labs |
Software to process the SRT trace format can be downloaded from the tools section of this website. |
1991 | 3 months | 357 MB |
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