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Disk Space

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Operating Systems Solaris Disk Space
# 8  
Old 06-15-2011
I always felt compressing filesystem reduces reliability. its a probably harder to fsck it in case of problems. I'd archive and delete log files first. perhaps uninstall some packages. shame scsi disks are so expensive.
# 9  
Old 06-15-2011
ZFS is much more reliable than UFS. Enabling compression doesn't change that.. It only slightly affects performance.
# 10  
Old 06-15-2011
Quote:
Originally Posted by bartus11
Enabling compression doesn't change that.. It only slightly affects performance.
It usually does but by improving it !
Enabling compression on ZFS is increasing the overall i/o performance in most use cases.

---------- Post updated 16-06-11 at 00:00 ---------- Previous update was 15-06-11 at 23:54 ----------

Quote:
Originally Posted by orange47
I always felt compressing filesystem reduces reliability.
On windows, definitely.
Quote:
its a probably harder to fsck it in case of problems.
ZFS neither provides nor need fsck. You never need to fsck a ZFS file system. It is always consistent by design.
# 11  
Old 06-16-2011
Nice ZFS summary: ZFS - THe newest file system, explained in human terms



Compression just means:
  1. the data on disk is smaller
  2. the data is more random
  3. if the data is corrupted, a bigger part or the remainer of the file is likely lost (but this is not 1962 tape or 1969 disk, and there is backup, raid and mirroring!)
  4. Because it reads fewer pages of disk for more pages of RAM, and CPUs are hugely faster than disks, serial read write flow is faster. Write flow is a bit more CPU intensive, might not beat raw disk. However, ZFS buffers writes a lot, and who has only one CPU any more? LZJB should be much faster than gzip, but perhaps twice as large?
  5. Next point is a bit speculative, as I could not find an exact description of ZFS compression blocking: Random access requires reading compressed blocks on disk from the beginning, and, for writes, recompression of entire separate compressed block.
I wonder if they ever considered deferring compression of each file until the data goes quiescent?
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