l**s 发帖数: 20567 | 1 是选Fusion Drive 还是 256GB Flash Storage?
给个意见哈,多谢 |
a***y 发帖数: 19743 | 2 当然是Fusion啊
best of two worlds
【在 l**s 的大作中提到】 : 是选Fusion Drive 还是 256GB Flash Storage? : 给个意见哈,多谢
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l**s 发帖数: 20567 | 3 嗯,听你的
谢谢
【在 a***y 的大作中提到】 : 当然是Fusion啊 : best of two worlds
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M********t 发帖数: 5032 | 4 ssd更好
fusion不上不下的,实质就是用一块Flash做cache。
【在 l**s 的大作中提到】 : 是选Fusion Drive 还是 256GB Flash Storage? : 给个意见哈,多谢
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a***y 发帖数: 19743 | 5 你说的不对。
★ 发自iPhone App: ChineseWeb 7.8
【在 M********t 的大作中提到】 : ssd更好 : fusion不上不下的,实质就是用一块Flash做cache。
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l**s 发帖数: 20567 | 6 到底听谁的,左右为难哈
意见不同一就不买了哈
呵呵。。。 |
l**t 发帖数: 6971 | 7
阿提说的对。另外那位是只知道Windows的落后算法,以为Mac也是那样。
【在 l**s 的大作中提到】 : 到底听谁的,左右为难哈 : 意见不同一就不买了哈 : 呵呵。。。
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l**s 发帖数: 20567 | 8 多谢大家,已经买了
27-inch iMac
With the following configuration:
• 3.2GHz Quad-core Intel Core i5, Turbo Boost up to 3.6GHz
• 16GB 1600MHz DDR3 SDRAM - 2X8GB
• 3TB Fusion Drive
• NVIDIA GeForce GTX 675MX 1GB GDDR5
• Magic Trackpad
• Apple Wireless Keyboard (English) & User's Guide
• Accessory Kit
AppleCare Protection Plan for iMac - Auto-enroll
$119.00
【在 l**t 的大作中提到】 : : 阿提说的对。另外那位是只知道Windows的落后算法,以为Mac也是那样。
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a***y 发帖数: 19743 | 9 我自己配的Hacintosh是 3.5Ghz i7
32GB 1600 MHz DDR3
Intel 520 Series 180GB + 1TB ST fusion drive
+ 2TB Time Machine backup
office的是
* 3.4GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz
* 8GB 1600MHz DDR3 SDRAM - 2x4GB
* 1TB Fusion Drive
* NVIDIA GeForce GTX 675MX 1GB GDDR5
* Apple Magic Mouse
* Apple Wireless Keyboard (English) & User's Guide
不过内存也是自己加到32GB
【在 l**s 的大作中提到】 : 多谢大家,已经买了 : : 27-inch iMac : : With the following configuration: : • 3.2GHz Quad-core Intel Core i5, Turbo Boost up to 3.6GHz : • 16GB 1600MHz DDR3 SDRAM - 2X8GB : • 3TB Fusion Drive : • NVIDIA GeForce GTX 675MX 1GB GDDR5 : • Magic Trackpad
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l**s 发帖数: 20567 | 10 这么高的配置你打算用多少年?
我的机子大约4年就不行了
【在 a***y 的大作中提到】 : 我自己配的Hacintosh是 3.5Ghz i7 : 32GB 1600 MHz DDR3 : Intel 520 Series 180GB + 1TB ST fusion drive : + 2TB Time Machine backup : office的是 : * 3.4GHz Quad-core Intel Core i7, Turbo Boost up to 3.9GHz : * 8GB 1600MHz DDR3 SDRAM - 2x4GB : * 1TB Fusion Drive : * NVIDIA GeForce GTX 675MX 1GB GDDR5 : * Apple Magic Mouse
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d*******e 发帖数: 1649 | |
a***y 发帖数: 19743 | 12 四年不够了么
【在 l**s 的大作中提到】 : 这么高的配置你打算用多少年? : 我的机子大约4年就不行了
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a***y 发帖数: 19743 | 13 确实是
【在 d*******e 的大作中提到】 : 内存可以只买8G的,以后自己加到32G。
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M********t 发帖数: 5032 | 14 唉,我回晚了!
我就是做storage 这行的啊!
【在 l**s 的大作中提到】 : 多谢大家,已经买了 : : 27-inch iMac : : With the following configuration: : • 3.2GHz Quad-core Intel Core i5, Turbo Boost up to 3.6GHz : • 16GB 1600MHz DDR3 SDRAM - 2X8GB : • 3TB Fusion Drive : • NVIDIA GeForce GTX 675MX 1GB GDDR5 : • Magic Trackpad
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l**s 发帖数: 20567 | 15 俺是想节省些
呵呵
【在 a***y 的大作中提到】 : 四年不够了么
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l**s 发帖数: 20567 | 16 现在先用着,以后需要再加吧
【在 d*******e 的大作中提到】 : 内存可以只买8G的,以后自己加到32G。
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l**s 发帖数: 20567 | 17 嗯,以后有需要就找你了
【在 M********t 的大作中提到】 : 唉,我回晚了! : 我就是做storage 这行的啊!
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a***y 发帖数: 19743 | 18 你说说这个fusion drive怎么就是缓存了?
据说这个是block level的啊。把访问频繁的block放在SSD上。一个大文件,如果只是
频繁访问文件某个部分,其他部分可以继续放在HDD上。
具体使用体验也和SSD没啥区别,启动之类的都是飞快。有些东西是明显放在HDD上的。
【在 M********t 的大作中提到】 : 唉,我回晚了! : 我就是做storage 这行的啊!
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M********t 发帖数: 5032 | 19 It is "write both", "read ssd" if cache hit.
Since the cache size is limited, you will get bad performance if miss,
especially for random access pattern which is always miss.
【在 a***y 的大作中提到】 : 你说说这个fusion drive怎么就是缓存了? : 据说这个是block level的啊。把访问频繁的block放在SSD上。一个大文件,如果只是 : 频繁访问文件某个部分,其他部分可以继续放在HDD上。 : 具体使用体验也和SSD没啥区别,启动之类的都是飞快。有些东西是明显放在HDD上的。
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a***y 发帖数: 19743 | 20 A portion of SSD space is used as a write-back buffer to absorb incoming
write traffic, which hides perceivable latencies and boosts write
performance.
A portion of SSD space is used as a write-back buffer to absorb incoming
write traffic, which hides perceivable latencies and boosts write
performance.
A set of algorithms and techniques are designed to decide in which device (
the SSD or the hard drive) data should be stored and accessed. A simplified
view of the rules is to store the smaller, more frequently accessed data in
the SSD and the larger, less frequently used data in the hard drive.
这部分是block level的
Data movement is based on runtime access patterns. During idle periods, data
is adaptively migrated to the most suitable devices to provide sustained
data processing performance for users.
Wikipedia上信息蛮全的
https://en.wikipedia.org/wiki/Fusion_Drive
【在 M********t 的大作中提到】 : It is "write both", "read ssd" if cache hit. : Since the cache size is limited, you will get bad performance if miss, : especially for random access pattern which is always miss.
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M********t 发帖数: 5032 | 21 The functionality you described from the wiki is indeed a cache. And cache
miss does impact the performance.
simplified
in
【在 a***y 的大作中提到】 : A portion of SSD space is used as a write-back buffer to absorb incoming : write traffic, which hides perceivable latencies and boosts write : performance. : A portion of SSD space is used as a write-back buffer to absorb incoming : write traffic, which hides perceivable latencies and boosts write : performance. : A set of algorithms and techniques are designed to decide in which device ( : the SSD or the hard drive) data should be stored and accessed. A simplified : view of the rules is to store the smaller, more frequently accessed data in : the SSD and the larger, less frequently used data in the hard drive.
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a***y 发帖数: 19743 | 22 Maybe. My everyday usage is very smooth though. Even if there is a miss, it
doesn't affect me.
cache
★ 发自iPhone App: ChineseWeb 7.8
【在 M********t 的大作中提到】 : The functionality you described from the wiki is indeed a cache. And cache : miss does impact the performance. : : simplified : in
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a***n 发帖数: 428 | 23 看看这里http://d.pr/VhRO
That 4GB write buffer is the only cache-like component to Apple's Fusion
Drive. Everything else works as an OS directed pinning algorithm instead of
an SSD cache. In other words, Mountain Lion will physically move frequently
used files, data and entire applications to the 128GB of NAND Flash storage
and move less frequently used items to the hard disk. The moves aren't
committed until the copy is complete (meaning if you pull the plug on your
machine while Fusion Drive is moving files around you shouldn't lose any
data). After the copy is complete, the original is deleted and free space
recovered. |