# \#rca **URL:** https://discourse.oceanobservatories.org/tag/rca/3.md [Latest](https://discourse.oceanobservatories.org/latest.md) · [Categories](https://discourse.oceanobservatories.org/categories.md) · [Tags](https://discourse.oceanobservatories.org/tags.md) --- ## [OOI Cassandra Data Loss Incident -- April 15 to May 19, 2026](https://discourse.oceanobservatories.org/t/ooi-cassandra-data-loss-incident-april-15-to-may-19-2026/1011)
**Author:** [@chris.wingard](https://discourse.oceanobservatories.org/u/chris.wingard)\ **Replies:** 6\ **Last updated:** [July 7, 2026, 11:38pm UTC](https://discourse.oceanobservatories.org/t/ooi-cassandra-data-loss-incident-april-15-to-may-19-2026/1011 "2026-07-07T23:38:57Z")
On April 15, 2026, following routine maintenance on the Apache Cassandra database cluster, the system entered an unstable state known as an asymmetric network partition. While this did not cause a full outage, it resulte… --- ## [OOI-RCA Virtual Office Hours for Data Access & Support](https://discourse.oceanobservatories.org/t/ooi-rca-virtual-office-hours-for-data-access-support/933)
**Author:** [@amber.coogan](https://discourse.oceanobservatories.org/u/amber.coogan)\ **Replies:** 0\ **Last updated:** [May 28, 2025, 3:11pm UTC](https://discourse.oceanobservatories.org/t/ooi-rca-virtual-office-hours-for-data-access-support/933 "2025-05-28T15:11:07Z")
Join the OOI-RCA Data Team for our Monthly Virtual Office Hours: :date: Monday, June 9th, 2025 :one\_o\_clock: 1–2 PM PT / 4–5 PM ET :round\_pushpin: On Zoom (Open to all!) Whether you’re a seasoned user or just getting… --- ## [OOI-RCA Data Team Monthly Virtual Office Hours for Data Access & Support](https://discourse.oceanobservatories.org/t/ooi-rca-data-team-monthly-virtual-office-hours-for-data-access-support/908)
**Author:** [@amber.coogan](https://discourse.oceanobservatories.org/u/amber.coogan)\ **Replies:** 0\ **Last updated:** [April 24, 2025, 4:30pm UTC](https://discourse.oceanobservatories.org/t/ooi-rca-data-team-monthly-virtual-office-hours-for-data-access-support/908 "2025-04-24T16:30:35Z")
Join the OOI-RCA Data Team for our Monthly Virtual Office Hours: :date: April 28 :one\_o\_clock: 1–2 PM PT / 4–5 PM ET :round\_pushpin: On Zoom (Open to all!) Whether you’re a seasoned user or just getting started, we’r… --- ## [RCA powered down on 5/6/24 for maintenance/Power to be restored 5/7/24](https://discourse.oceanobservatories.org/t/rca-powered-down-on-5-6-24-for-maintenance-power-to-be-restored-5-7-24/774)
**Author:** [@dtrewcrist](https://discourse.oceanobservatories.org/u/dtrewcrist)\ **Replies:** 0\ **Last updated:** [May 6, 2024, 1:56pm UTC](https://discourse.oceanobservatories.org/t/rca-powered-down-on-5-6-24-for-maintenance-power-to-be-restored-5-7-24/774 "2024-05-06T13:56:09Z")
Maintenance is scheduled on the RCA which will require the system to be powered down at 0800 PT on Monday, 6 May. The system will be powered after completion of maintenance activities, but no later than 0800 PT on Tuesda… --- ## [Where to find Methodology citation for Shipboard samples? espec. chlorophyll HPLC samples?](https://discourse.oceanobservatories.org/t/where-to-find-methodology-citation-for-shipboard-samples-espec-chlorophyll-hplc-samples/618)
**Author:** [@Mneely12](https://discourse.oceanobservatories.org/u/Mneely12)\ **Replies:** 1\ **Last updated:** [December 5, 2022, 8:02pm UTC](https://discourse.oceanobservatories.org/t/where-to-find-methodology-citation-for-shipboard-samples-espec-chlorophyll-hplc-samples/618 "2022-12-05T20:02:49Z")
What is the Methodology citation used for Shipboard chlorophyll extraction samples? Is this listed in the cruise SOP? I am also interested in the Methodology citation used for all shipboard sample collections. If it d… --- ## [Design of the OOI Regional Cabled Array northern and southern lines](https://discourse.oceanobservatories.org/t/design-of-the-ooi-regional-cabled-array-northern-and-southern-lines/609)
**Author:** [@mvardaro](https://discourse.oceanobservatories.org/u/mvardaro)\ **Replies:** 4\ **Last updated:** [November 17, 2022, 9:25pm UTC](https://discourse.oceanobservatories.org/t/design-of-the-ooi-regional-cabled-array-northern-and-southern-lines/609 "2022-11-17T21:25:25Z")
Hi Tom, The southern line of the Regional Cabled Array, which connects to the Oregon Offshore and Shelf sites of the Endurance Array, starts at the same shore station as the northern line in Pacific City, OR. The northe… --- ## [CTD Rosette SOP](https://discourse.oceanobservatories.org/t/ctd-rosette-sop/563)
**Author:** [@fogaren](https://discourse.oceanobservatories.org/u/fogaren)\ **Replies:** 3\ **Last updated:** [August 29, 2022, 12:34pm UTC](https://discourse.oceanobservatories.org/t/ctd-rosette-sop/563 "2022-08-29T12:34:35Z")
Hi, I am trying to find any documentation related to how discrete water samples are collected during CTD Rosette profiles. Specifically, how long does the Rosette stop at a depth before firing bottles? Thank you, Kris… --- ## [Question about IRIS pressure gauge data inconsistencies](https://discourse.oceanobservatories.org/t/question-about-iris-pressure-gauge-data-inconsistencies/285)
**Author:** [@mvardaro](https://discourse.oceanobservatories.org/u/mvardaro)\ **Replies:** 13\ **Last updated:** [June 9, 2022, 10:19pm UTC](https://discourse.oceanobservatories.org/t/question-about-iris-pressure-gauge-data-inconsistencies/285 "2022-06-09T22:19:15Z")
Dear OOI: I am Li Wang, a Ph.D. candidate working on a geophysics project associated with the Axial Seamount. Thanks for running the well-maintained database. The data I downloaded from IRIS is the vertical component of… --- ## [Did you know PIs can add instruments to OOI infrastructure?](https://discourse.oceanobservatories.org/t/did-you-know-pis-can-add-instruments-to-ooi-infrastructure/151)
**Author:** [@dtrewcrist](https://discourse.oceanobservatories.org/u/dtrewcrist)\ **Replies:** 0\ **Last updated:** [March 1, 2021, 6:28pm UTC](https://discourse.oceanobservatories.org/t/did-you-know-pis-can-add-instruments-to-ooi-infrastructure/151 "2021-03-01T18:28:17Z")
In this month’s issue of Download, read about how a PI-added Cabled Instrument is providing real-time sonar measurements of hydrothermal plume emissions. It is but one example of how PIs are thinking about how they can h…