Dariush Debian Diary

Motto: quoting xfs whitepaper from 1996 usenix conference: With today's 9 gigabyte disk drives it only takes 112 disk drives to surpass 1 terabyte of storage capacity (emphasis mine). http://oss.sgi.com/projects/xfs/papers/xfs_usenix/index.html

XFS: eXtended File System (SGI, Unix, Windows)

What are 'journaled filesystems': filesystems with journal.

Good:
1. Old and very well-tested: shipping since 1994
2. Very good performance on large IOS
3. Fully 64bit filesystem, has no problem with large files and discs, very well tested ( literaly decades ) with terabyte-range files and filesystems.
4. Security: damaged files gets zeroed...
5. Native quota
6. Native acl
7. Native EAs

Bad:
1. Relatively new to linux. But still - oldest journaling filesystem available on Linux
2. Slow on small files ( with 1-2k sized files even ext2 is way faster)
3. Convenience: damaged files gets zeroed... supposedly this is the issue with all journaling filesystems
4. Not very popular - issues with exotic software: quotes inside virtual servers, etc..
5. Not very simple codebase, stable and well-tested, but very big and relatively intrusive. (non-issue on 2.6, where lots of needed support was moved to lower layers, things like variable-size IO requests, delayed allocation )
6. Takes few % more of diskspace then others, it bit me when I tried to convert partition that was 99% full...
7. On related note - xfs is very slow when filesystem is 99.x% full,
9. No data=journal
10. You can't use it in raid1 both driectly on hardware and via md1

See more ...

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• ppp+ssh
• IPSec - FreeS/WAN
• pptp
• openvpn
• cipe
• ?tinc?

Toys:

• http://amvpn.sf.net Amrita VPN (ssl-based)
• http://htun.runslinux.net HTun - tunnelling via http

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