A screen capture enabling you to capture videos off your X-Window desktop
for illustration or documentation purposes. It is intended to be a
standards-based alternative to tools like Lotus ScreenCam.
.
Video can be saved in MPEG or AVI files format.
.
This package provides the GTK 2.0 version.
試用了一下，很讚且很方便，拖拉一下擷取的大小，按下 record 鍵就一直錄影了，強烈推荐使用
1:Mail spam
2:softraid 5 規劃
3:debian tips organization
今天透過 rsync 把自己的 home 都轉移到雙 CPU 的主機上，買了這個主機快半年了，我竟然都沒用，只是拿來當任天堂或是當老婆的上網機，自從有了 notebook 之後，老婆就用我的 nb 了，所以這一台雙 CPU 主機就沒再用了...(看到的人別打我...:-P)
雙 CPU 的主機配備如下：
CPU：Althon MP 1800x2
Ram：Micro Registered+ECC 512mbx2
MB：Tyan-2466-4m(就是它害我只想用 Tyan 的板子)
HD：Seagate ST336607 10k.6 36G 的萬轉 SCSI 硬碟
VGA：Elsa Nvidia Quadro NVS200 PCI （PCI 方便擴充，AGP還可以裝一個 3D 加速卡）
SCSI card：LSI ULTRA 160
Combo機：Aopen Combo
Power：僑威 550W（12V有 36 安培喔）
Case：偉訊 69u9
未來的電腦計畫：
Dual Xeon + PCI-e 的主機板 + SCSI Raid...不知道要等到什麼時候了...:-)
埃...只剩下最後四隻小老鼠而已,從以前的 3x 多隻到現在的四隻,以前第一隻小老鼠死掉時,心中百感焦急,甚至是想哭.
但現在傷心的感覺比較少了,因為比較能接受小老鼠死亡的事實,畢竟死不能復生,說不一定他解脫了...XD
要好好珍惜剩下的,其中一隻可是我養小老鼠的第一隻喔,已經2歲半了,真的是 "老" 鼠
From StorageReview
In February of 2003, we took a brief time-out from our standard, single-drive testing to formally address what we normally refuse to touch with a 12-foot pole- a RAID0 array. Why? The StorageReview Discussion community, mirroring forums around the net, burgeoned with hundreds of posts from readers seeking advice on which RAID adapter to get and which hard drives to stripe for their power rigs.
Simple theory, however, indicated that striping would not significantly help the localized (as opposed to both random and sequential), low-depth usage that dominated even highly-multitasked, single-user scenarios. The best advice, as a result, was to avoid striping. Many readers, however refused to believe.
The February test combined a pair of 200-gig Maxtor DiamondMax 9 drives with a Promise PATA RAID controller and demonstrated that the gains in striping them were minimal especially when one considered that a large portion of what gain there was due to the doubling of capacity and the resulting smaller distances that the actuator must travel to execute the same chain of disk accesses.
There were still objections, irrational as they were:
“It’s only 7200 RPM! 10,000 RPM drives would have done better!”
“It’s only PATA! SATA would have done better!”
“It’s only eye-dee-eee! SCSI would have done better!”
“You tested only two drives! A larger array would have done better!”
And so on.
Our recent TCQ, RAID, SCSI, and SATA article examined the performance of a myriad of controller/interface/drive-count/raid-level combinations that addressed the objections above (though admittedly as a side effect of testing TCQ’s effects on RAID arrays; we do not believe further empirical results were really necessary to back logic and theory). Many readers here at SR and across the net, unfortunately, seemed to have missed the article… though it is extremely relevant to those debating the relative merits or lack thereof of RAID arrays for non-server use. Consider this interesting example:
In the “SR Gaming DriveMark… a 4 drive Cheetah array.. lags a single Raptor running on the "dumbest" of SATA controllers by a margin of 9%.”
If you’re still confused about RAID, you owe it to yourself to check out the review.
Though the idea that RAID0 does not significantly assist desktop performance is not new to SR, AnandTech has recently corroborated the idea with results of their own. Confirming that no significant gain is realized when striping a pair of Raptors off of an ICH5 controller, Anand writes:
"If you haven't gotten the hint by now, we'll spell it out for you: there is no place, and no need for a RAID-0 array on a desktop computer."
Interestingly, the feedback associated with Anand’s article reads like a laundry list of the same irrational objections SR had to overcome. Anand is free, of course, to link to SR’s articles which, ironically, address virtually every objection raised by his RAID0 proponents .
It is our hope that these findings taken as a whole will stem an internet-wide trend where enthusiast-oriented websites blithely incorporate RAID0 into their "high-end" single-user boxes, ignorant to both theory and empirical results.
More discussion may be found here- weigh in with your thoughts!
-----------
所以 raid 0 對於一般桌上型並不會加速，只適合大檔傳輸，系統硬碟還是採用高轉速，低搜尋時間的硬碟為主。
繼續用我的 SCSI 硬碟吧...:D
from Moto:硬體 raid 卡
基本上，小弟之前才去碰觸這個問題，所以剛好有點不才的研究，拿出來『野人現曝』一下，還請各位不要見笑：
1．等級如ADAPTEC_SCSI_RAID_2200S類：利用本身的處理晶片與XOR邏輯晶片，可以有效的運用了SCSI的低處理器負載特點與外掛XOR晶片加速運算處理的功能，並具有例如RAID5+0、HOT SWAP、HOT SPACE等功能，普遍在大型資料庫上會見到相似的產品．
2．等級如ADAPTEC_2000S的產品之類：此類產品無法只依靠自己運作，必須依賴其他的SCSI介面卡，利用主機板上的PCI-X通道與南橋晶片組的頻寬作為資料傳輸通道．基本的特性如同第一點，但因為頻寬比較窄小，無法擁有像第一點所提到的產品的速度與效能，而且需要佔用多一個PCI-X介面，所以只能當作小型或者折衷的方案．
3．等級如HighPoint_Raid_133之類：本身沒有辦法做到RAID功能，必須透過驅動程式與外掛程式，讓作業系統認為這是一個RAID裝置．特點是價格低廉，但缺點是如果你今天換了一個作業系統，這裡面的資料都會跟你say good bye．資料確保度也比較差一點，因為作業系統昏過去，所有資料就不太容易取出與挽回，所以軟體式的比較沒有人採用...
Debian GNU /Linux無痛起步 ．作者：葉信佑、陳漢儀
．出版社：博碩文化
這本書出現在今年八月號Linux Magazine美國的雜誌,我在美國的Borders書局看到,有一小篇幅的介紹,你們的書上了美國的雜誌,雜誌中英文翻譯叫做Debian Painless Guide for Newbies.我想那並非官方翻譯只是雜誌的介紹,文中並提到這是第一本Debian繁體中文的書,還刊有書的封面
PS：不知道該不該取一個官方名字
昨天將 /dev/shm 掛載的 tmpfs 加大到 768M(更改/etc/default/tmpfs)，然後抓 firefly 的 Openoffice 裝在這個地方。
想不到第一次開啟的速度不需要 2 秒，比已往快太多了，ram的速度比 hard drive快太多了... :-D
有興趣的朋友也可以來玩玩看喔，目前都是在 /dev/shm下面compile軟體...:-)
BTW...tmpfs 預設是掛載 ram的一半大小，您可以自行加大，但不要超過太多，以免系統用到 SWAP，這樣反而會變慢喔... ;-)
這是在 BBS 上小弟 post 的文章，讓大家參考看看目前 raid 卡支援的程度。
關於 acard aec-6880 raid 卡官方說在linux下只能使用soft raid,且無法認出該卡 bios 所建立
得 raid partition。所以說, acard 6280 = aec 6880 in Linux
但小弟對該家的產品不是很喜歡,因為都不能提供 redhat/suse 以外的driver
請他們提供 debian 得 driver 被拒絕...:-(
目前只有 3ware 是pure hardware raid
high-point/promise/si 也是軟體raid,只是 linux
能讀寫raid 卡上得bios所建立的 raid 磁區，但讀寫
依然是 linux soft raid。(Kernel 說明因為這樣能提高穩定度以及效能)
您可以參考 kernel source 中關於 ATA soft raid 以及 3warexxxx.h
得 source code 或是 doc
阿...忘了說明,si3112/4a 以及 siw680 都只有支援 raid 0喔
不支援 raid 1. 如果預算無問題的話,可以考慮 3ware 的產品
如果有預算,可以買 high point.有提供kernel 2.4/2.6 x86 64
而Promise 只有kernel2.4 的而已，有點可惜...
BTW.如果您的系統只有 Linux，可以考慮用 soft raid，效能上也不輸給
卡上的bios喔...:-)
------補充
最近另外買了一張 ite8212f的 raid 卡，這個晶片常常出現在 gigabyte or ASUS 的主機板上，廠商有提供 source code可以下載且可以讀寫卡上bios所建立的raid 磁區，該卡價格在 650左右，算是經濟又實惠...:-)