Edward Jaffe pisze:
Mark Jacobs wrote:
We have a problem when a hfs/zfs grows to a huge size and since partial
release doesn't work on these files to recover the allocated but unused
space we have to perform a copy process to a new dataset.
We have the same issue here. Our daily backups and weekly dumps got
slower and slower and we didn't know why. Turned out many of our HFS/ZFS
files had grown unbelievably huge (due to temporary spikes in needed
DASD capacity), yet were practically empty. Reallocating them was no
trivial task. A real PITA!
It is a problem, however there are some means to relieve it.
1. Keep "operational" files away from ROOT and product filesystems. Such
filesystems should be R/O or treat as R/O. Keep all R/W files in
dedicated containers (HFSes).
2. You can use many containers for different applications, file behaviors.
3. Last but not least: DO NOT DUMP those filesystems! Do file-level
backups. In such case it doesn't matter how many extents filesystem has.
Only size of the content apply.
4. The system-critical HFSes like ROOT can be dumped once because they
don't change. Or it can be dumped everytime - but it's still unchanged
so its size is constant.
My $0.02
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Radoslaw Skorupka
Lodz, Poland
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BRE Bank SA
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