{
  "slug": "what-fails-comparison",
  "title": "Low-end NetApp interconnect events exceed disk events, 4,338 to 3,230",
  "kind": "dataset",
  "summary": "In Jiang et al., FAST 2008, Table 1, low-end NetApp systems recorded 4,338 physical-interconnect failure events and 3,230 disk failure events from January 2004 through August 2007 (22,031 systems and 264,983 FC disks ever installed). For Figure 4(b), which excludes subsystems that used Disk H, that class has a stated disk AFR of 0.9% and a storage-subsystem AFR of 4.6%. In Maneas et al., FAST 2020, Table 2, SCSI error is 32.78% of SSD replacements (ARR 0.055%) on almost 1.4 million NetApp SSDs; that signal is a hardware error the SSD reports (the example is drive DRAM ECC), while aborted commands are 13.56% (ARR 0.023%) and include a host or connection case where write data never reaches the device.",
  "license": "Small derived table of figures stated in Jiang et al., FAST 2008, and Maneas et al., FAST 2020. Not a Creative Commons license. The opened FAST '14 Consent Form for Refereed Papers says USENIX lets authors retain copyright and asks only for a right to publish. That grant is non-exclusive, worldwide, perpetual, and irrevocable, and also non-sublicensable and non-transferable. The form contains no CC grant. This CSV is not the NetApp AutoSupport database and not the Active IQ bundles. Neither paper links a public dump or a data DOI for those logs. Canonical files are the USENIX PDFs.",
  "licenseUrl": "https://www.usenix.org/sites/default/files/fast14_consent_author.pdf",
  "sourceUrl": "https://www.usenix.org/legacy/events/fast08/tech/full_papers/jiang/jiang.pdf",
  "accessed": "2026-10-08",
  "rowCount": 33,
  "columns": [
    {
      "name": "row_kind",
      "type": "string",
      "description": "Which stated cut the row transcribes: jiang-table1, jiang-figure4b, jiang-share, or maneas-table2."
    },
    {
      "name": "study",
      "type": "string",
      "description": "Citation id of the paper that states the row."
    },
    {
      "name": "fleet",
      "type": "string",
      "description": "Named fleet: NetApp AutoSupport or NetApp Active IQ."
    },
    {
      "name": "window",
      "type": "string",
      "description": "Study window as year-month bounds. Jiang is January 2004 through August 2007 (44 months). Maneas is the 30 months covered by 10 snapshots from January 2017 through May 2019."
    },
    {
      "name": "system_class",
      "type": "string",
      "description": "Jiang storage-system class (near-line, low-end, mid-range, high-end, or all four classes) or ssd sample."
    },
    {
      "name": "population",
      "type": "string",
      "description": "Who was counted, which cut (Table 1, Figure 4(b) excluding Disk H, cross-class prose, or Table 2), and what the count is not."
    },
    {
      "name": "fault",
      "type": "string",
      "description": "Named failure or replacement reason, using the paper's categories."
    },
    {
      "name": "systems_count",
      "type": "integer",
      "description": "Systems (count) from Jiang Table 1. Empty when the row is not a Table 1 class row. Not a Figure 4(b) population."
    },
    {
      "name": "shelves_count",
      "type": "integer",
      "description": "Shelf enclosures (count) from Jiang Table 1. Empty when the row is not a Table 1 class row."
    },
    {
      "name": "disks_ever_installed_count",
      "type": "integer",
      "description": "Disks ever installed (count) during the 44 months, including replacements, from Jiang Table 1. Empty when the row is not a Table 1 class row. Not the Maneas SSD population."
    },
    {
      "name": "failure_events",
      "type": "integer",
      "description": "Failure events (count) for that fault in Jiang Table 1. Empty when the source did not state an event count for the row."
    },
    {
      "name": "share_low_percent",
      "type": "number",
      "description": "Share, low (%). Jiang cross-class prose uses a range. The low-end Figure 4(b) disk row uses 20 for the paper's about-20% of subsystem AFR. Maneas Table 2 percent of replacements is a point, so low equals high. Empty when not stated."
    },
    {
      "name": "share_high_percent",
      "type": "number",
      "description": "Share, high (%). Equal to share_low_percent when the source stated a point rather than a range. Empty when not stated."
    },
    {
      "name": "annual_rate_percent",
      "type": "number",
      "description": "Annual rate (%). AFR for Jiang Figure 4(b) prose, or ARR for Maneas Table 2. Empty when the source did not state an annual rate for the row. Not a line rate and not a throughput."
    },
    {
      "name": "annual_rate_kind",
      "type": "string",
      "description": "AFR or ARR when annual_rate_percent is set. Empty otherwise. AFR and ARR are different definitions and are not converted into each other."
    },
    {
      "name": "signal",
      "type": "string",
      "description": "The log or telemetry signal the paper says catches this fault."
    },
    {
      "name": "misses",
      "type": "string",
      "description": "What that signal does not prove, from a sentence in the same paper."
    },
    {
      "name": "citation_id",
      "type": "string",
      "description": "Id into the citations list. Open that URL for the sentence."
    }
  ],
  "downloadPath": "/data/datasets/what-fails-comparison.csv",
  "citations": [
    {
      "id": "jiang-fast08",
      "title": "Are Disks the Dominant Contributor for Storage Failures? A Comprehensive Study of Storage Subsystem Failure Characteristics",
      "url": "https://www.usenix.org/legacy/events/fast08/tech/full_papers/jiang/jiang.pdf",
      "accessed": "2026-10-08"
    },
    {
      "id": "maneas-fast20",
      "title": "A Study of SSD Reliability in Large Scale Enterprise Storage Deployments",
      "url": "https://www.usenix.org/system/files/fast20-maneas.pdf",
      "accessed": "2026-10-08"
    },
    {
      "id": "fast14-consent",
      "title": "FAST '14 Consent Form for Refereed Papers",
      "url": "https://www.usenix.org/sites/default/files/fast14_consent_author.pdf",
      "accessed": "2026-10-08"
    }
  ]
}