backup
http://cyrilwang.blogspot.tw/2013/09/glusterfs.html 去年我介紹過利用 lsyncd 這個套件來達成目錄的同步備援，今天則要利用 glusterfs 來達成類似的效果。雖說類似，但是 lsyncd 與 glusterfs 相比有下列差別： * lsyncd 監測目錄的變動，並定期 (或達到一定的異動次數) 將異動同步到另外一個目錄。因為 lsyncd 採用 inotify 監測技術，所以如果目錄內的檔案或子目錄一多，就可能會產生無法監測的問題。 * lsyncd 本身並沒有支援高可用性，必須利用其它機制 (如 heartbeat) 來達成高可用性。 * 被同步的目錄通常僅能當做備援，無法作為負載平衡之用。不但在資源使用上較為浪費，擴充性也比較差。 嚴格來說，拿 lsyncd 與 glusterfs 相比並不是一件公平且合理的事情，因為 glusterfs
configuration
Environment Red Hat Enterprise Linux 7 device-mapper-multipath LUNs with ALUA enabled Issue All paths for a LUN are grouped all together even though they come with different priority from the external storage. The output of "multipath -ll" shows something like the following: mpatha (360021868018107e0c000000000000098) dm-16 IBM ,2145 size=
configuration
Once replication on a dedupe policy is enabled, the IP address in the target server cannot be changed. In the event the IP address must be changed, it has do be performed using the provided utility via an ssh session. The utility is only available in VTL 5.2 version.
Troubleshooting
Title URL Name What-files-are-in-a-CDP-NSS-V7-X-ray Questions & Answers Q: What files are in a CDP/NSS X-ray? A: Refer to the table below for CDP/NSS v7 X-ray files. Files in blue, are commonly used by Tech Support for preliminary troubleshooting. Files in green are used for further investigation. CDP/NSS
database
Dell 2950, IOCore ESX server Build Machine as below, 172.22.12.212 ———————————————————————————————————— IOCore XWiki server VM on team ESX server Name: Lisber-W2k8-ezScrum IP: 172.22.5.246 Account/Passwd: Administrator/abc=123 Wiki admin's account/passwd: Admin/iocore102 (case sensitive) XWiki folder located at C:\XWiki\xwiki_
backup
I have gone through a scenario when some of backup images were no longer required and we decided to discard those images and reuse the media. This is how we achive it. 1. Verify if there are valid images on the tape. 2. Expire images. 3. Verify if the tape
backup
Installing/reinstalling the sg and the st drivers Description You must install the NetBackup sg driver and the Sun st driver on each Solaris NetBackup media server that hosts tape devices. Each time you add or remove a device, you should configure the NetBackup sg driver and the Sun st
Server
https://www.opencsw.org OpenCSW (pronounced open-cashew /ˈkæʃuː/) is an easy to use open source software distribution installable on top of Solaris and Solaris-based systems. OpenCSW is a community project dedicated to working closely with upstream projects to improve portability of open source software. OpenCSW Solaris packages are provided in
Network
https://szlin.me/2017/07/19/debian-9-release/ 2017 年 07 月 19 日szlin Debian 9 開始, 網路介面命名方式開始有所差異. 以往有線網路介面使用 eth0, eth1 等等的命名, 但這樣的機制容易因為 driver 初始化順序不同而導致介面順序不固定, 進而造成使用上的問題. (例: 防火牆設定, 或者其他與介面名稱緊密相關的應用等等) 這問題尤其在嵌入式相關領域非常容易碰到. systemd v197 開始, 引入Predictable Network Interface Names [2] 的設計. 其範圍包含有線, 無線等等的網路介面 (local Ethernet, WLAN and WWAN) 並在 systemd v220 成預設選項 而
configuration
Introduction Collecting and visualizing data is an important way to make informed decisions about your servers and projects. In a previous guide, we discussed how to install and configure Graphite to visualize data on our servers. However, we didn't have a good way of collecting or even passing
configuration
Oracle的優化器(Optimizer)-Analysis 標籤： Oracle Oracle的優化器(Optimizer)有兩種優化方式, Hint也不例外，除了/*+rule*/其他的都是CBO優化方式 基於規則的優化方式(Rule-Based Optimization，簡稱為RBO) 基於成本的優化方式(Cost-Based Optimization，簡稱為CBO) RBO(Rule-Based Optimization)方式：優化器在分析SQL語句時,所遵循的是Oracle內部預定的一些規則。比如我們常見的，當一個where子句中的一列有索引時去走索引。 CBO(Cost-Based Optimization)方式：它是看語句的成本(Cost),這裡的成本主要指CPU和記憶體RAM。 優化器在判斷是否用這種方式時,主要參照的是表及索引的統計資訊。統計資訊給出表的大小、 有多少行、每行的長度等資訊。這些統計資訊起初在庫內是沒有的，是做 Analyze 後才出現的，很多的時侯過期統計資訊會令優化器做出一個錯誤的執行計畫, 因些應及時更新這些資訊
configuration
SQL SERVER 轉 ORACLE 標籤： Oracle 1. 透過SQL SERVER 2008 Standard版本的IMPORT/EXPORT 轉換 2. 安裝Oracle Client/設定TNS 3. Create Oracle User Account/Create Oracle Datafile 4. import data to Oracle 5. 注意事項 環境： Source: SQL Server Express 2008 R2 Target: Oracle DB 10.2.0.4 轉換Server：SQL Server 2008