Linked by Thom Holwerda on Tue 24th Oct 2006 20:56 UTC
Sun Solaris, OpenSolaris "When eWEEK Labs first reviewed Sun Microsystems' Solaris 10 early last year, we were impressed by the new facilities the operating system offered for better serving up applications and making the most of the SPARC and x86 hardware on which it runs. With this summer's Solaris 10 update, labeled 6/06, Sun has significantly improved on its already excellent operating system with the addition of the much-heralded Zettabyte File System."
Thread beginning with comment 175187
To read all comments associated with this story, please click here.
ZFS vs. LVM+JFS2
by chicklin on Wed 25th Oct 2006 13:41 UTC
chicklin
Member since:
2006-01-05

I've heard a lot of hype about ZFS, read the docs, watched the demos, etc. This is not intended as a flame, but I am an AIX consultant and I can't, for the life of me, figure out what ZFS brings to the table that you can't do with LVM+JFS2 on AIX. It is being pitched as a technological advancement light-years ahead of any other UNIX vendor and I just don't see it.

Can someone enlighten me as to why ZFS is so much better than anything else that's out there?

Reply Score: 1

RE: ZFS vs. LVM+JFS2
by ptman on Wed 25th Oct 2006 14:06 in reply to "ZFS vs. LVM+JFS2"
ptman Member since:
2005-08-08

For one, it's just ZFS instead of LVM and a file system. It's integrated, it's easier.

Second, it's got RaidZ. It's supposedly better than e.g. Raid5. I don't know much about it though.

Third, is the cryptographically strong filesystem integrity checking. Raid can recover from a drive dying totally (well, not RAID0), but if the drive is flaky and gives false data, ZFS will detect that _and_ attempt to fix it on the fly.

Fourth, ZFS features cheap and fast filesystem snapshots. I don't know about JFS2 though.

Please correct me if I'm wrong.

Reply Parent Score: 2

RE[2]: ZFS vs. LVM+JFS2
by chicklin on Wed 25th Oct 2006 14:34 in reply to "RE: ZFS vs. LVM+JFS2"
chicklin Member since:
2006-01-05

> For one, it's just ZFS instead of LVM and a file system. It's integrated, it's easier.

A good point, integration is good. However, on AIX the LVM and FS components are very well integrated from a sysadmin point of view. True, they are separate components, but expanding a filesystem is one operation, creating a new filesystem is one operation, taking a snapshot is one operation. The commands used integrate the LVM and FS steps to do each of those tasks.

> Second, it's got RaidZ. It's supposedly better than e.g. Raid5. I don't know much about it though.

I probably need to read more about RaidZ, but my cursory understanding is that it is basically software RAID, albeit integrated with the FS/LVM layer. I still think I would prefer hardware-based RAID.

> Third, is the cryptographically strong filesystem integrity checking. Raid can recover from a drive dying totally (well, not RAID0), but if the drive is flaky and gives false data, ZFS will detect that _and_ attempt to fix it on the fly.

You may have a good point there. I'm not aware of that capability in JFS.

> Fourth, ZFS features cheap and fast filesystem snapshots. I don't know about JFS2 though.

JFS2 can do snapshots quickly and without much disk space. I think it's pretty much implemented the same way UFS snapshots are on FreeBSD. Could be wrong about that, though.

Reply Parent Score: 1