iTunes slow changing metadata

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iTunes slow changing metadata

Post by jnoxon » Fri Dec 21, 2012 11:50 am

I have my iTunes library on ZEVO CE 1.1.1. This issue has existed at least since Z410 Beta 2011-10-17. It was not reported before because I assumed iTunes was at fault. I realized it must be something else when I found that rebooting cures the issue for several minutes.

If I select an album in iTunes and change a metadata item for all songs in the album, it takes iTunes a very long time (on the order of 2 seconds per track) to write the updated metadata. I've noticed that if I reboot, I can perform the same operations nearly instantaneously (no progress bar even appears), but after a few minutes the I/O starts to crawl again. It is not a progressive deterioration; It's lightning fast for a while and then suddenly becomes slow. I attempted using SSD's for cache and ZIL and it made no difference.

iTunes is also very slow and unresponsive when importing new media. I have not investigated whether this improves after a reboot or when the iTunes library is on HFS+

Unlike another user, I've had no trouble with streaming performance to Apple TV, watching HD movies, etc.
Last edited by jnoxon on Fri Dec 21, 2012 12:05 pm, edited 1 time in total.
jnoxon Offline


 
Posts: 14
Joined: Tue Sep 18, 2012 9:53 am

Re: iTunes slow changing metadata

Post by jnoxon » Fri Dec 21, 2012 12:03 pm

From system.log after changing the genre of an album:

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Dec 21 10:54:14 beast.i.noxon.cc iTunes[4025]: Possible unresolved transaction race -109/(Music/Of Monsters and Men/My Head Is An Animal,(null))
Dec 21 10:54:44 --- last message repeated 14 times ---
Dec 21 10:54:44 beast.i.noxon.cc iTunes[4025]: Possible unresolved transaction race -109/(Music/Of Monsters and Men/My Head Is An Animal,(null))
Dec 21 10:54:58 --- last message repeated 7 times ---
Dec 21 10:54:59 beast.i.noxon.cc iTunes[4025]: Possible unresolved transaction race -109/(Music/Of Monsters and Men/My Head Is An Animal,(null))


> 45 seconds to change 12 tracks

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$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                        ZFS                         999.9 GB   disk0s2
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *640.1 GB   disk1
   1:                        EFI                         209.7 MB   disk1s1
   2:                        ZFS                         639.8 GB   disk1s2
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *640.1 GB   disk2
   1:                        EFI                         209.7 MB   disk2s1
   2:                        ZFS                         639.8 GB   disk2s2
/dev/disk3
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *128.0 GB   disk3
   1:                        EFI                         209.7 MB   disk3s1
   2:                  Apple_HFS Beast                   127.7 GB   disk3s2
/dev/disk4
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *96.0 GB    disk4
   1:                        EFI                         209.7 MB   disk4s1
   2:                        ZFS                         95.7 GB    disk4s2
/dev/disk5
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *640.1 GB   disk5
   1:                        EFI                         209.7 MB   disk5s1
   2:                        ZFS                         639.8 GB   disk5s2
/dev/disk6
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.0 TB     disk6
   1:                        EFI                         209.7 MB   disk6s1
   2:                  Apple_HFS Time Machine            903.2 GB   disk6s2
   3:                  Apple_HFS Nightly Backup          96.5 GB    disk6s3
/dev/disk7
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *640.1 GB   disk7
   1:                        EFI                         209.7 MB   disk7s1
   2:                        ZFS                         639.8 GB   disk7s2
/dev/disk8
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *2.0 TB     disk8
   1:                        EFI                         209.7 MB   disk8s1
   2:                  Apple_HFS CrashPlan               2.0 TB     disk8s2
/dev/disk9
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *640.1 GB   disk9
   1:                        EFI                         209.7 MB   disk9s1
   2:                        ZFS                         639.8 GB   disk9s2
/dev/disk10
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:             zfs_pool_proxy Data                   *3.8 TB     disk10
   1:       zfs_filesystem_proxy Security                107.4 GB   disk10s1
   2:       zfs_filesystem_proxy iTunes                  1.2 TB     disk10s2
/dev/disk11
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *314.6 MB   disk11
   1:                  Apple_HFS ZEVO - Community Edi... 314.5 MB   disk11s1


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$ diskutil corestorage list
No CoreStorage logical volume groups found


Code: Select all
$ zpool list
NAME    SIZE   ALLOC    FREE     CAP  HEALTH  ALTROOT
Data  3.49Ti  2.99Ti   512Gi     85%  ONLINE  -

Code: Select all
beast:~ jeff$ zfs list
NAME             USED   AVAIL   REFER  MOUNTPOINT
Data           1.99Ti   304Gi   697Gi  /Volumes/Data
Data/Security  30.9Gi  69.1Gi  30.9Gi  /Volumes/Data/Security
Data/iTunes     856Gi   304Gi   800Gi  /Volumes/Data/iTunes

Code: Select all
beast:~ jeff$ zpool status
  pool: Data
 state: ONLINE
 scan: scrub repaired 0 in 6h32m with 0 errors on Sun Dec  9 21:00:09 2012
config:

   NAME                                           STATE     READ WRITE CKSUM
   Data                                           ONLINE       0     0     0
     raidz2-0                                     ONLINE       0     0     0
       GPTE_0BB75EF3-82E7-4876-BEEF-01710358DB3A  ONLINE       0     0     0  at disk5s2
       GPTE_4CC6362F-2E80-4272-9AF5-5953594C0A95  ONLINE       0     0     0  at disk0s2
       GPTE_35206857-DE65-4EFA-8E6A-760FF9030A8F  ONLINE       0     0     0  at disk2s2
       GPTE_9F113482-4496-4D78-81D0-08DF4A6AD75E  ONLINE       0     0     0  at disk9s2
       GPTE_99E2AFAD-3C7A-452B-9C2E-B1039874FC21  ONLINE       0     0     0  at disk7s2
       GPTE_749D5458-CB86-46CF-99AB-DE76AC042449  ONLINE       0     0     0  at disk1s2
   cache
     GPTE_9805199C-F67A-4296-BF6D-83F4BF0026E0    ONLINE       0     0     0  at disk4s2

errors: No known data errors


NOTE: I previously had iTunes in the main volume, not a subvolume, and this did not affect performance.

I am running 10.8.2; I have 16GB RAM.
jnoxon Offline


 
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Taking a hint from an earlier topic about iTunes

Post by grahamperrin » Fri Dec 21, 2012 1:49 pm

Reading this topic alongside viewtopic.php?t=1537&p=2944#p2944

When the problem occurs, please run spindump with focus on Tunes.
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Re: iTunes slow changing metadata

Post by jnoxon » Sun Dec 23, 2012 8:49 am

jnoxon Offline


 
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Joined: Tue Sep 18, 2012 9:53 am

Re: iTunes slow changing metadata

Post by mk01 » Sun Jan 06, 2013 5:51 pm

same for me in both points (updates and exactly no other issues)

are you sure HFS is ok here?

mk
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