My choice of Network Attached Storage (NAS)

I had a West Digital My Book World, and it is dead now (hard drive failure). I am not happy with the device because the read/write speed from it was very slow (limited by the low end CPU it has). Because of that, I was using it only as a back-up server and used rsync to do the automatic update.

Around the same time, I also built a ZFS/Solaris based file server using a very old computer. It might consume more power than those small NAS, but it has been stable for years and the read/write speed is fast! The only drawback of that setting is the operation system. Currently, only FreeBSD and Solaris have native ZFS support. Linux native ZFS is coming, but its non-testing version is too long overdue~~ Since, Sun has been acquired by Oracle and Oracle closed source of Solaris (ZFS b28), the future of Solaris/ZFS is not clear. I haven't tracked its open source version illumos and OpenIndiana. FreeBSD very likely will be the choice of my next big file server. Be aware that the FreeBSD's implementation is missing kernel CIFS server, which could be provided by userspace Samba server. It has native NFSv4 ACLs.

Which I haven't decided is how exactly the hard drives will be set up: raidz2 provides double-parity and will stand 2 disks failure in a 5-disk pool; but the space in the server may be limited, raidz1 might be just enough (1 disk failure in a 3-disk pool).

Optimal sizes
RAIDZ1 vdevs should have 3, 5, or 9 devices in each vdev
RAIDZ2 vdevs should have 4, 6, or 10 devices in each vdev
RAIDZ3 vdevs should have 5, 7, or 11 devices in each vdev

As for the server expansion

zpool set autoexpand=on pool

It is possible to replace each disk, one by one with larger ones to increase your pool size. It is also possible to attach a second pool to the first; for example, you could add a second raidz2 to your first, ie, a raidz2 of 6 disks, and add a raidz2 pool of 8 disks for a total of 10 data disks, 4 are protected by 2 and 6 are protected by a different 2. It is Not possible to take a raidz2 of 6 disks and add 2 to make it a raidz2 pool of 8 disks.

Why I am posting this? Because I saw a post here and I have different views.

发信人: weidong (伊拉克学习小组副组长), 信区: Apple
标 题: 我的普文二NAS.
发信站: BBS 未名空间站 (Mon Apr 16 22:51:28 2012, 美东)

最近版上NAS的议论有些. 我也最近对这些东西很感兴趣. 我的构想是让我的所有
书啊音乐啊电影啊全部能在IPAD上放出. 从此再也不用坐在PC前面. 实验了几个NAS
方案. 花了将近500刀. 总结如下:

1. 普通NAS: SYNOLOGY 211J. 这个牌子的老型号, 我没有处女情节, 买了个129刀的
REFURB, 原价要199刀呢. 但是软件可以更新到最新的. 各种网络共享方案都有, MEDIA
SERVER, WEB, SAMB, FTP, WEBDAV, ITUNES等等, 还能装第三方软件做TORRENT, NZB
下载机. 界面也比较简洁流畅. 现在正在熟悉使用中, 但是以后肯定是主力机. 4TB
大硬盘已经放入. 三个USB接口, 老硬盘们也直接能上. 其他DLINK, WD也有相同的产品,
但是这个好评不少, 推荐一下.

2. 文艺NAS: POGOPLUG SERIES 4. 我买的是原价89的, 木有找到滴儿. 这个东西来的
时候
几乎没有什么设置就上手了. 但是所有的服务要走POGOPLUG的自己的系统. 看的很花稍,
什么网页界面, 多用户共享神马的, 还有IPAD APP! 但是仔细追究一下, 就漏马脚了.
连最基本的SMB,FTP都没有. 只有一个伪SMB, 还要用POGOPLUG自己的一个软件.MEDIA
SERVER倒是有, 但是只能和我的PS3, XBOX联用, APPLE TV却不行.太泥马文艺了点.
不过还必须留下, 因为我爸爸妈妈喜欢, 觉得以后用这个来分享孙女的照片方便.
所以....这个东西实际想造也可以, 自己刷机成LINUX, 然后什么功能就都
有了. 但是为了老人家的便利我不能啊. 昨天又订了个处理的POGOPLUG MOBILE, 准备
刷了看看, 但是考虑到我不是WS硅公, 比较挠头. 如果家里有老人, 可以推荐, 但是走
WS技术流的, 还是NO.1价格便宜量又足.

3. 二逼NAS. WLX-652. 不折不扣的土共山寨机! 我花了35刀通过EBAY从轰孔买的. 有中
国特色的WEBGUI和CHIGLISH说明书看起来特亲切. 这个出壳就有FTP, SMB, MEDIA
SERVER,还带一个BT下载功能. 人家机壳上特地写明了BT DOWNLOAD来吸引眼球的. 但
一用就二逼了, 这个山寨系统很不稳定, 经常会死机误事. 更二逼的是, 居然在网上
找不到是哪个公司出品的, 也没有更新固件一说了. 好在有国外达人写了个SNAKE OS
LINUX系统, 自己可以刷了用, 会加上什么SMB, FTP, SFTP, WEB SERVER, BT,
MEDIA SERVER等等. 但是苦逼的是, 这个系统不支持中文. 泥马, 我的文件很多是
中文的(还有日文的呢), 还是不完美. 当然如果你动手能力强, 可以在SNAKE OS上
装DEBIAN扩展出很多花样,但是, 再说一遍, 本人不是南湾WS硅公...唉. 不过我也
不退了, 麻烦也没多少钱. 反而, 我要把它推荐给广大技术流WSN们, 没准你们能搞
定中文也未可知. 而且, 才泥马35刀, 也就请你隔壁新来的小女F1出去DATE下, 吃个
巴肥的钱. 再说, 我脚的造这个比造隔壁新来的小女F1要好玩多了.

介绍完毕.
--
※ 修改:·weidong 于 Apr 16 22:53:08 2012 修改本文·[FROM: 99.33.]
※ 来源:·BBS 未名空间站 海外: mitbbs.com 中国: mitbbs.cn·[FROM: 99.33.]

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