2個硬碟如何實時備份?不是備援喔 - 3C

By Doris
at 2020-03-22T12:05
at 2020-03-22T12:05
Table of Contents
最近買2個6 TB HDD。
一開始我就打算做備份用,
2個硬碟做raid 1鏡像。
後來爬文看到:raid 1是備援、不能算是備份。雖然1個硬碟物理損壞,另一個硬碟的資
料
還救得回來;
但是,因為2個硬碟是鏡像,在電腦裡面就等於1個硬碟,我如果手滑誤刪,或者檔案有錯
誤
......,鏡像是「同時連動」的,2顆硬碟的資料會同時毀損或消失。
如果是2個硬碟、不做raid1但定期備份的話;因為不是同時連動的,所以主硬碟資料有問
題
,我可以選擇不要備份到另一個硬碟。
但是,如果是實時備份(不論同一台電腦或異地),不也是和Raid1一樣,主硬碟有動靜、
另
一顆備份的硬碟也跟著連動?
為什麼網路上有網友強調「備份」和「備援」的不同,並警告不要太依賴「raid 1」?
當然,最好的辦法是異地備份(最好做到Nas上面)、2地的硬碟做R1,既有備
份
又有備援,資料遺失的風險就很低了。但這樣一份硬碟要做4個(2*2),蠻不划算的....
..
或是說,R1是備援也沒關係,至少比單用1顆硬碟什麼都不做、安全很多了,R1已經
規避掉「一顆硬碟壞,資料全毀」的危險,2顆硬碟都壞的機率不是零,只要別同時壞,1
顆
時可以馬上再買新的補救。
只是比異地備份危險ㄧ點點而已?
3顆硬碟也是折衷作法,異地、其中1地做R1.....
今天我只有一顆硬碟要做備份,為來若是有3顆、4顆硬碟呢?4*2和4*3顆、4*4個硬碟(
外
加nas或硬碟架......),成本就貴好幾倍了。
--
一開始我就打算做備份用,
2個硬碟做raid 1鏡像。
後來爬文看到:raid 1是備援、不能算是備份。雖然1個硬碟物理損壞,另一個硬碟的資
料
還救得回來;
但是,因為2個硬碟是鏡像,在電腦裡面就等於1個硬碟,我如果手滑誤刪,或者檔案有錯
誤
......,鏡像是「同時連動」的,2顆硬碟的資料會同時毀損或消失。
如果是2個硬碟、不做raid1但定期備份的話;因為不是同時連動的,所以主硬碟資料有問
題
,我可以選擇不要備份到另一個硬碟。
但是,如果是實時備份(不論同一台電腦或異地),不也是和Raid1一樣,主硬碟有動靜、
另
一顆備份的硬碟也跟著連動?
為什麼網路上有網友強調「備份」和「備援」的不同,並警告不要太依賴「raid 1」?
當然,最好的辦法是異地備份(最好做到Nas上面)、2地的硬碟做R1,既有備
份
又有備援,資料遺失的風險就很低了。但這樣一份硬碟要做4個(2*2),蠻不划算的....
..
或是說,R1是備援也沒關係,至少比單用1顆硬碟什麼都不做、安全很多了,R1已經
規避掉「一顆硬碟壞,資料全毀」的危險,2顆硬碟都壞的機率不是零,只要別同時壞,1
顆
時可以馬上再買新的補救。
只是比異地備份危險ㄧ點點而已?
3顆硬碟也是折衷作法,異地、其中1地做R1.....
今天我只有一顆硬碟要做備份,為來若是有3顆、4顆硬碟呢?4*2和4*3顆、4*4個硬碟(
外
加nas或硬碟架......),成本就貴好幾倍了。
--
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