Robert Milkowski wrote:
Hello Matthew,
Tuesday, March 31, 2009, 9:16:42 PM, you wrote:
MA> Robert Milkowski wrote:
Hello Matthew,
Excellent news.
Wouldn't it be better if logical disk usage would be accounted and not
physical - I mean when compression is enabled should quota be
accounted based by a logical file size or physical as in du?
MA> ]
MA> The compressed space *is* the amount of space charged, same as struct stat's
MA> st_blocks and du(1) (and the "referenced" property, and the "used" property,
MA> etc). I don't think that we ever report the uncompressed size; it's only
MA> available indirectly by multiplying by the "compressratio" property.
What I mean is: assume user joe have a quota of 1GB.
So he creates a file fill in with 1's which is 5GB in size.
ls utility will confirm it is 5GB in size while du will say it is
100MB (haven't done the actual tes but you get the idea).
So from a user perspective isn't it a little bit confusing as he
managed to write more data than he thinks he is allowed to.
>From a sysdmin perspective Nicilas is probably right that in most
cases they would care more about physical usage than logical, or would
they?
I think what this says is that from a practical perspective, quotas are
either ineffective or incomprehensible for modern systems. By ineffective
I mean that you cannot limit a user's use of space, you can only limit
that to which the user is accounted. Perhaps we should change it from
"quota" to "goodwill," to borrow a term from the accounting world :-)
-- richard
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