available space and free space discrepancies

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available space and free space discrepancies

Post by grahamperrin » Mon Oct 08, 2012 10:38 pm

zfs and zpool in ZEVO Community Edition 1.1.1 (Build 2012.09.23),
Finder in OS X 10.8.2 (Build 12C60).

GoFlex Desk (0x50a5) connected to
Sitecom USB 2.0 Dock CN-022 (0x0022); that hub connected to a
MacBookPro5,2 with 8 GB memory.

Following a send and receive with intentionally little free space at the destination:

25.08 GB available according to the status bar of Finder,
35.3Gi free according to zpool,
 6.21Gi free according to zfs.

By exporting, disconnecting then reconnecting I get Finder to report
6.67 GB available, but I remain puzzled by differences between figures at the command line.

35.3 - 6.21
= 29.09

So, what's that 29.09 Gi?

Any guesses? (If I'm overlooking something basic, sorry.)

Code: Select all
macbookpro08-centrim:~ gjp22$ date
Tue  9 Oct 2012 03:43:20 BST
macbookpro08-centrim:~ gjp22$ zfs get available tall
NAME  PROPERTY   VALUE   SOURCE
tall  available  6.21Gi  -
macbookpro08-centrim:~ gjp22$ zpool list
NAME     SIZE   ALLOC    FREE     CAP  HEALTH  ALTROOT
gjp22   572Gi   376Gi   196Gi     65%  ONLINE  -
tall   1.82Ti  1.78Ti  35.3Gi     98%  ONLINE  -
macbookpro08-centrim:~ gjp22$ zfs list
NAME                                       USED   AVAIL   REFER  MOUNTPOINT
gjp22                                     376Gi   187Gi   313Gi  /Volumes/gjp22
tall                                     1.78Ti  6.21Gi   440Gi  /Volumes/tall
tall/backups                              909Gi  6.21Gi  10.9Gi  /Volumes/tall/backups
tall/backups/LaCie d2 Extreme            2.04Mi  6.21Gi   588Ki  /Volumes/tall/backups/LaCie d2 Extreme
tall/backups/LaCie d2 Extreme/11G         756Ki  6.21Gi   756Ki  /Volumes/tall/backups/LaCie d2 Extreme/11G
tall/backups/LaCie d2 Extreme/12A         748Ki  6.21Gi   748Ki  /Volumes/tall/backups/LaCie d2 Extreme/12A
tall/backups/blocky                      3.31Gi  6.21Gi  3.31Gi  /Volumes/tall/backups/blocky
tall/backups/gjp22                        423Gi  6.21Gi   308Gi  /Volumes/tall/backups/gjp22
tall/backups/zhandy                       472Gi  6.21Gi   398Gi  /Volumes/tall/backups/zhandy
tall/backups/zhandy/Pocket Time Machine  52.8Gi  6.21Gi  52.8Gi  /Volumes/tall/backups/zhandy/Pocket Time Machine
macbookpro08-centrim:~ gjp22$ uptime
 3:44  up 18:02, 4 users, load averages: 0.56 1.96 2.36
macbookpro08-centrim:~ gjp22$ sw_vers
ProductName:   Mac OS X
ProductVersion:   10.8.2
BuildVersion:   12C60
macbookpro08-centrim:~ gjp22$ uname -a
Darwin macbookpro08-centrim.home 12.2.0 Darwin Kernel Version 12.2.0: Sat Aug 25 00:48:52 PDT 2012; root:xnu-2050.18.24~1/RELEASE_X86_64 x86_64


http://www.wuala.com/grahamperrin/publi ... de=gallery for screenshots and other files.

Postscript

Sorry, I found a probable answer:

ZFS FAQ (Community Group zfs.faq) - XWiki: Why doesn't the space that is reported by the zpool list command and the zfs list command match?

Time for me to do some reading … keyword overhead.
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Re: available space and free space discrepancies

Post by grahamperrin » Fri Oct 12, 2012 9:53 pm

grahamperrin wrote:… By exporting, disconnecting then reconnecting I get Finder to report …


Should that routine be necessary?

Or should Finder report the truth relatively soon after the free space exists?
grahamperrin Offline

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