Will XFS be adopted
Andrew Snow
andrew at modulus.org
Tue Nov 18 16:48:55 PST 2008
Dan wrote:
> Has anyone done any bechmarks? Is the cache really helping that much?
1. The downside to the ZFS benefits of instantaneous snapshots, clones,
and filesystem-level RAID, is that it has to go through its metadata
when you want to search directories or read files. A big cache helps
make that faster as the commonly loaded tree nodes are pre-fetched and
cached.
File data is also pre-fetched, ZFS can handle multiple forward or
backward reading streams per open file.
2. Much of the cache is used for writing cache, the more memory that can
be thrown at that the more optimised the writing to disk can be.
> If
> it doesn't, and it performs similarly to other journaling FSes that do
> not use this much RAM, well, if it's not waste then what?
As I said above, the other filesystems don't give you built-in instant
snapshotting and RAID.
> Does it guarantee the same atomicity that UFS does?
Yes.
> Is it OK to run an email server on it? Will I lose messages in cases of powerfail/crash?
It is perfect for running email because the transparent compression
saves you space and I/O time. However, I would wait until it has been
considered stable and moved into the 7-STABLE tree before deploying a
production server.
- Andrew
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