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斯巴达第二季

董昊 ( Robin Dong ). On 03 14, 2013 4:53 PM. 查了一下资料，multi-device系列的设备包括flashcache和linux下的软raid 都不支持原始的分区方式，只能用lvm创建logic volume来代替分区。 Create diskgroup data external redundancy disk '/dev/raw/raw1','/dev/raw/raw2';. Create diskgroup data external redundancy disk '/dev/mapper/cachedev1','/dev/mapper/cachedev. ERROR at line 1:. ORA-15018: diskgroup cannot be created. ORA-15130: diskgroup "DATA" is being dismounted. Drop diskgroup DATA;. ERROR at line 1:. ORA-15039: diskgroup not dropped. 答是的，需要一些琐碎的计算，这些计算的...

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斯巴达第二季 | oldblog.donghao.org Reviews

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董昊 ( Robin Dong ). On 03 14, 2013 4:53 PM. 查了一下资料，multi-device系列的设备包括flashcache和linux下的软raid 都不支持原始的分区方式，只能用lvm创建logic volume来代替分区。 Create diskgroup data external redundancy disk '/dev/raw/raw1','/dev/raw/raw2';. Create diskgroup data external redundancy disk '/dev/mapper/cachedev1','/dev/mapper/cachedev. ERROR at line 1:. ORA-15018: diskgroup cannot be created. ORA-15130: diskgroup DATA is being dismounted. Drop diskgroup DATA;. ERROR at line 1:. ORA-15039: diskgroup not dropped. 答是的，需要一些琐碎的计算，这些计算的...

<META> KEYWORDS

1 斯巴达第二季

2 oracle asm与flashcache兼容问题

3 by donghao

4 permalink

5 comments 0

6 trackbacks 0

7 试了一下

8 chown oracle dba /dev/mapper/cachedev

9 查到这个资料

10 这次还报错，说

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斯巴达第二季,oracle asm与flashcache兼容问题,by donghao,permalink,comments 0,trackbacks 0,试了一下,chown oracle dba /dev/mapper/cachedev,查到这个资料,这次还报错，说,于是尝试删除 data 这个diskgroup,最后也没成功,我唉，看来大屏还是不好弄啊,老婆我先凑合着用吧,我等过几天我再买个新膜，再试一次，这个贴膜很有市场的，我好好练练,老婆嗯，练好了去地铁口摆个摊，赚点外快,else {

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斯巴达第二季 | oldblog.donghao.org Reviews

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董昊 ( Robin Dong ). On 03 14, 2013 4:53 PM. 查了一下资料，multi-device系列的设备包括flashcache和linux下的软raid 都不支持原始的分区方式，只能用lvm创建logic volume来代替分区。 Create diskgroup data external redundancy disk '/dev/raw/raw1','/dev/raw/raw2';. Create diskgroup data external redundancy disk '/dev/mapper/cachedev1','/dev/mapper/cachedev. ERROR at line 1:. ORA-15018: diskgroup cannot be created. ORA-15130: diskgroup "DATA" is being dismounted. Drop diskgroup DATA;. ERROR at line 1:. ORA-15039: diskgroup not dropped. 答是的，需要一些琐碎的计算，这些计算的...

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oldblog.donghao.org

1

SSD Internal - 斯巴达第二季

http://www.oldblog.donghao.org/2012/11/ssd-internal.html

董昊 ( Robin Dong ). 10 15, 2012. 10 22, 2010. 08 11, 2010. On 11 24, 2012 9:42 AM. Listed below are links to blogs that reference this entry: SSD Internal. TrackBack URL for this entry: http:/ www.baidu.com/cgi-bin/blog/mt-tb.cgi/3189. This page contains a single entry by DongHao. 11 24, 2012 9:42 AM. Was the previous entry in this blog. Is the next entry in this blog. Find recent content on the main index. Or look in the 存档. To find all content.

2

修复ext4 bug一个 - 斯巴达第二季

http://www.oldblog.donghao.org/2012/12/jbd2-bugoo.html

董昊 ( Robin Dong ). 从panic的代码位置看，就是 jbd2 journal commit transaction() 里的. J ASSERT(journal- j running transaction! 但是，为什么jbd2在没有running transaction的时候也会提交事务那就只能把所有唤醒kjournald2内核线程里面调用了jbd2 journal commit transaction 的地方即wake up(&journal- j wait commit)处都加上trace，由于重现步骤是现成的，很快就定位到了原因 open一个文件再直接fdatasync的时候，会调用ext4 sync file ，里面调用jbd2 log start commit开始提交jbd2的日志，jbd2 log start commit里会加锁然后调用 jbd2 log start commit，代码如下:. Int jbd2 log start commit(journal t *journal, tid t target). Int difference = (x - y);.

3

CLSF 2012讨论会纪要（一） - 斯巴达第二季

http://www.oldblog.donghao.org/2012/10/clsf-2012ioauaioo.html

董昊 ( Robin Dong ). 10月11日到12日两天在EMC北京办公室参加了 CLSF 2012 讨论会. Btrfs已经具有了在线修改RAID的stripper大小、自动修复RAID1的坏盘等功能，且将meta block的size变为可调上限64K ，这样btree就矮了很多因为node大了，在删除大文件时seek过程变少了，删除速度更快。 Btrfs提供强大的snapshot功能，但是如果一个文件做了太多的snapshot，那么一个node可能有很多snapshot point指向它，如果现在要对这一个node进行操作 btrfs是广泛利用COW的，所以即使是覆盖写，也要copy出来一份新的，那么还需要把多个snapshot指下来的point都改为指向新node，反向查找很费力，以后计划加入了一个中间的ref，snapshot point都指向这个ref，ref再指向node，那么如果node变了位置，只要把ref改一下就行了，不用改所有的snapshot point。 Btrfs未来也会采用buddy system来管理free space 类似ext4 ，以减少磁盘碎片。

4

贴膜 - 斯巴达第二季

http://www.oldblog.donghao.org/2013/03/iua.html

董昊 ( Robin Dong ). 12 15, 2008. 11 14, 2008. 10 21, 2008. On 03 13, 2013 4:00 PM. Listed below are links to blogs that reference this entry: 贴膜. TrackBack URL for this entry: http:/ www.baidu.com/cgi-bin/blog/mt-tb.cgi/3217. This page contains a single entry by DongHao. 03 13, 2013 4:00 PM. Was the previous entry in this blog. Is the next entry in this blog. Find recent content on the main index. Or look in the 存档. To find all content.

5

ext4 bigalloc 答疑 - 斯巴达第二季

http://www.oldblog.donghao.org/2013/02/ext4-bigalloc-oe.html

董昊 ( Robin Dong ). 问文件分配的时候，ext4文件系统请求的时候是按照blocks来请求,但是ext4文件系统自己会按照cluster来分配这个的理解是否正确呢. 答应该说，不太准确，事实上, ext4文件系统请求分配磁盘空间的时候也是按照cluster来请求的了，ext4 ext map blocks() 函数是用来检查文件的逻辑位置对应的物理块的，里面申请新磁盘空间的调用是. Arlen = EXT4 NUM B2C(sbi, offset allocated);. Newblock = ext4 mb new blocks(handle, &ar, &err);. 问如果cluster为32K(8个blocks), 那么对于一个3k的文件来说,一次就分配了一个cluster,这样就有7个blocks不能在被其他文件使用了。答是的，需要一些琐碎的计算，这些计算的代码都放在了函数get implied cluster alloc()里. 答 bg free blocks count lo的含义实际是空闲的cluster的数量，看这个函数. 09 28, 2007.

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August 13, 2014. Http:/ oldblog.donghao.org. 这个旧博客以前是托管在楚水论坛 www.trucy.org 的，2013年初的时候由于机房原因，被迫中断服务，好在过去7年写的博客文章都还完好的存在硬盘上，只是无法访问。现在，在Parker的帮助下，终于把这些文章拷出来，用独立的域名 oldblog.donghao.org 重新放到了网上。 Http:/ blog.chinaunix.net/uid/20306820.html. Linux Kernel And Tao 涛哥. Meets Raspberry Pi 朱鸿.

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斯巴达第二季

董昊 ( Robin Dong ). On 03 14, 2013 4:53 PM. 查了一下资料，multi-device系列的设备包括flashcache和linux下的软raid 都不支持原始的分区方式，只能用lvm创建logic volume来代替分区。 Create diskgroup data external redundancy disk '/dev/raw/raw1','/dev/raw/raw2';. Create diskgroup data external redundancy disk '/dev/mapper/cachedev1','/dev/mapper/cachedev. ERROR at line 1:. ORA-15018: diskgroup cannot be created. ORA-15130: diskgroup "DATA" is being dismounted. Drop diskgroup DATA;. ERROR at line 1:. ORA-15039: diskgroup not dropped. 答是的，需要一些琐碎的计算，这些计算的...

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Ssh hlm-devel@192.168.16.234 可以进入服务器. Scp hlm-devel@192.168.16.234: /t.lua t.lua 失败，无错误提示，无百分比输出。 Scp root@192.168.16.234: /t.lua t.lua 正常. 执行 sftp hlm-devel@192.168.16.234。 Sftp Received message too long 458961715. Http:/ prystash.blogspot.com/2009/12/sftp-message-received-message-too-long.html. Http:/ www.linuxquestions.org/questions/slackware-14/sftp-received-message-too-long-887856/. Time scp -v t.lua hlm-devel@192.168.16.234:/home/hlm-devel/t.lua. 来自这里 http:/ bbs.chinaunix.net/forum.php? LuaL Reg l[...