使用 Archlinux 的朋友大概遇到过这样的烦恼，软件安装得比较多的时候，再用 pacman 做任何事情的时候都可以看到硬盘狂转一段时间，然后才有反应。
pacman 官方给了一个 pacman-optimize，它会把 pacman 数据库文件打包到别的地方，删除，然后再放回去。这样做可能会让这些零碎的文件在硬盘上是连续排列的，但实际效果却不是很好。
虽然用 Archlinux 应该有三年左右了，但我还从来没有看过 pacman 的数据库是什么模样。有一天终于忍不住去看了一下 /var/lib/pacman 下面到底是什么，原来是这么多零碎的小文件啊！
于是解决方案也就有了：把所谓的 pacman 数据库放到 reiserfs 文件系统里。如果你本来在这个地方用的就是 reiserfs 的话，那么不需要做任何事情， pacman 应该就很快了。如果你和我一样用的是 ext4 这样的文件系统，也不必慌张地把整个分区都换成 reiserfs。
新建一个 160 MB 的 reiserfs 文件 pacman_db.fs：
truncate pacman_db.fs --size 160M mkfs.reiserfs -f ./pacman_db.fs |
把现有的 pacman 数据库复制到这个 reiserfs 里面：
sudo mount pacman_db.fs -t reiserfs /mnt -o loop cp -a /var/lib/pacman/* /mnt sudo umount /mnt |
接下来修改 /etc/fstab，加上一行：
/[path_to_pacman_db]/pacman_db.fs /var/lib/pacman reiserfs defaults,loop 0 4 |
左边的 [path_to_pacman_db] 需要根据实际情况填一下。最右边的 4 应该是比 fstab 中其他条目大一些的数字，表示 fsck 检查时最后处理这个地方。
如果想让这个设置立即生效，执行 sudo mount /var/lib/pacman 即可。否则，重启一下就可以了。现在，使用 pacman -Syu 更新一下系统，是不是比以前快许多？ 
表示本来就很快，你该换笔记本了，哈哈~~
@pluskid :
不觉得，你多装些软件试试看？用 reiserfs 之后的 “resolving dependencies…” 会在 0.x 秒内结束，硬盘也不会闪，ext4 应该是办不到的。
@quark
原来你说的是 resolving dependencies 这里啊，确实有点慢~~
据说ext4 比 ext3 and 2 慢但对细碎文件支持ext3比2好，所以我现在统一采用ext3格式！算是保守吧！据说btrfs很强劲，不知道是否如此！
@君临天下 : 不知道你看到的是什么资料。ext4 在各方面的速度比 ext3 好，ext3 是比无日志的 ext2 慢一点。不过大量小文件的时候 extfs 都会悲剧……
我以前看的文件系统评测之一在这里，很不错，推荐参考。
刚刚把U盘格式化成reiserfs，用U盘来玩，呵呵。U盘处理小文件应该有优势
我现在就干脆全用reiserfs了，可能是快一点吧- –
@hzqtc : 是应该比较快…… 不好的地方就是如果 / 需要 fsck 的话，可能会有点麻烦
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请问，“新建一个 160 MB 的 reiserfs 文件 pacman_db.fs”，这一步，是在哪里创建？任意位置？
@hippo : 是的，这一篇文章主要就是说用 reiserfs 来处理 pacman 的 cache 中大量小文件的情况，效果比较明显。
不过我还是好奇，这个 pacman_db.fs 文件，是以什么形式存在硬盘上面的呢？比如，我的/是jfs的，然后在这里建立了这个reiserfs格式的文件，它就是一个文件放在那里了？
@hippo : 是的。正如 /dev/sda1 一样可以被当作块设备挂载。
OK,谢谢你的解释。那请问你把这个文件放在哪里的呢？我准备放在/var/lib/下，这样合适么？
@hippo : 我是把它放在那里的。这种做法其实有些亡羊补牢的感觉，如果很早就知道这样做的好处的话，在硬盘分区的时候就分出来一块地方就好了。
哈，文件系统的事情开始确实弄不清楚的……我现在Arch的根分区用了jfs，说是已经停止开发了……呜……
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root分區用的是reiserfs,但是我表示pacman依然慢
这样改动之后，有时候会开机自动fsck这个文件系统，可是此时/是只读的，所以就没办法检查，出错，得手动挂载……
你是怎么解决的？
把它单独弄成一个分区？
@oldherl : 我只在异常断电后遇到这个问题，届时需要手动 remount。如果在 fstab 中的最后一栏是 0 ，则回避自动检查，修改成比 / 大一些的数字则会在 / 挂载之后才会检查。
出状况了哦……前几天，给我出来这么个：
file system has been mounted 31 times without being checked
偏偏我还不会手工检查……还不敢乱来。怕给弄坏了。。。
@oppih : 先 unmount，再用 fsck 工具手工检查一次，然后再 mount 不会有问题的…… 如果怕出问题就先 copy 一份备份一下。
哎…不知不觉就能看懂了啊…