[Ikeda, Yamamoto-san, Oshino-san]

K-Log#20498の続きです。
https://klog.icrr.u-tokyo.ac.jp/osl/?r=20498

作業内容
1.DGSネットワークのLANケーブルの交換

 交換した対象は次のRackにある不良ケーブルです。
 N1, B1,C1,C3,C3,c4 Rackの全て
 不良と判断した基準はK-Log#20008の調査結果で示すツイストしていないケーブルです。
https://klog.icrr.u-tokyo.ac.jp/osl/?r=20008

2.K-Log#20498 の接続を全て元に戻しました。
 > Finally, k1ioo, k1ioo1, k1imc in the C1 rack and k1bs in the C2 rack were connected to the DAQ switch in the B1 rack directly.

 確認結果:
  DAQエラー(0x4000)が1分に１回程度発生することを確認。
  改善は見られませんでした。

3.DAQのネットワークスイッチが３段で接続されていたが、今回2段までに接続を変更しました。
 C1,C2,C3ラックのDAQはメタルケーブルでB1ラックのDAQスイッチと接続しています。
 k1dc0、両エンドとフロント２台、X500をB1ラックのスイッチに光で直接接続するように変更しました。

 確認結果:
  DAQエラー(0x4000)の改善は見られませんでした。

4.作業後にK-Log#20498 の接続のエラー対策を一部戻しました。
 > Finally, k1ioo, k1ioo1, k1imc in the C1 rack and k1bs in the C2 rack were connected to the DAQ switch in the B1 rack directly.
 最後にC1ラックのk1ioo, k1ioo1, k1imc のみB1 DAQ Rackへ直接接続しました。
 C2ラックのk1bsは戻しませんでした。

 確認結果:
  作業開始前と同じく頻繁にエラーが発生しないことを確認しました。
  明日まで様子を見ます。

---
[Ikeda, Yamamoto-san, Oshino-san]

This is a continuation of K-Log#20498.
https://klog.icrr.u-tokyo.ac.jp/osl/?r=20498

[Work Details]
1. Replacement of LAN cables in DGS network

 The cables were replaced with defective cables in the following racks.
 N1, B1, C1, C3, and c4 Racks
 The criteria used to determine a cable as defective is a non-twisted cable as indicated by the results of the K-Log#20008 survey.
https://klog.icrr.u-tokyo.ac.jp/osl/?r=20008

2. all of K-Log#20498's connections have been restored.
 > Finally, k1ioo, k1ioo1, k1imc in the C1 rack and k1bs in the C2 rack were connected to the DAQ switch in the B1 rack directly.
https://klog.icrr.u-tokyo.ac.jp/osl/?r=20498

 Confirmation Result:
  A DAQ error (0x4000) was observed to occur approximately once every minute.
  No improvement was observed.

3. The DAQ network switch was connected in 3 levels, but the connection was changed to 2 levels this time.
 DAQ in racks C1, C2, and C3 are connected to the DAQ switch in rack B1 with a metal cable.
 k1dc0, both ends and two fronts, and X500 were changed to be connected directly to the switch in the B1 rack via optical.

 Verification Result :
  There was no improvement in the DAQ error (0x4000).

4. After the work, we reverted some error countermeasures for K-Log#20498 connection.
 > Finally, k1ioo, k1ioo1, k1imc in the C1 rack and k1bs in the C2 rack were connected to the DAQ switch in the B1 rack directly.
 Finally, only k1ioo, k1ioo1, and k1imc in the C1 rack were connected to the B1 DAQ Rack directly.
 The k1bs in the C2 rack was not returned.

 Check Result :
  We confirmed that the error did not occur as frequently as before we started the work.
  We will see how it goes until tomorrow.