Current xserve raid speed rate not fast enough

guys,
my xserve raid having problem when i edit HD project 1920*1080, its ok when i edit, but when i view all 30 mins movie, its hang when play till 5 mins of the movie, and keep on hanging after that, why is that? is it because the setting of my xserve raid got problem? read n write speed not fast enough?
help plzzzz

Both the write cache ticks should be on, The allow host cache flushing should be off. The use steady streaming mode tick should be off also. (So the pattern of th ticks is: on, off, on, off)
The stripes stting depends on the cache size of the disk. On disks with lower than 16 MB, the 8 stripes setting is right. On disks from 16MB cache you can use the 128 stripes setting (In general the 750 GB disks have 16 MB, the others have lower).

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Our XServe-RAID volume does not mount anymore...

Our XServe-RAID volume does not mount anymore.
On /var/log/system.log I could find the following.
Feb 22 09:52:29 ogre kernel: jnl: open: journal magic is bad (0xf433f != 0x4a4e4c78)
Feb 22 09:52:29 ogre kernel: hfs: early jnl init: failed to open/create the journal (retval 0).
It appears the the journaling is badly screwed.
I tryed to disable the journaling with no success.
Here is what I get.
ogre:/var/log root# diskutil disablejournal disk2s3
The selected journaling request does not appear to be valid
After some googling I foud this :
--- QUOTE ---
The more serious problem occurs when the contents of the journal file are corrupted in such a way that the operating system does not proceed to mount the volume. Fortunately, this problem is extremely rare (I have seen three reports of corrupted journal files at the MacFixIt Forums and Apple Discussion Forums since journaling was introduced).
Starting the journaling process is one of the first things that happens when a volume is recognized by the operating system. There appears to be no way to intervene in single-user mode before the journal file is examined. A message about �bad journal magic� appears. Unfortunately, every tool that can turn off journaling requires that the volume already be mounted.
If the Macintosh can boot under Mac OS 9, dealing with a corrupted journal file involves restarting under Mac OS 9 and using a utility (such as our free TechTool Lite 3.0.4) to make visible these two invisible files at the root level of the volume:
/.journal
/.journalinfoblock
Once these files are made visible, they can be deleted. Mac OS 9 does not support journaling, and recognizes nothing special about these files. Neither of these files can be seen in Terminal or in single-user mode in Mac OS X, because they are considered part of the disk directory.
If the Macintosh cannot boot under Mac OS 9, but the drive has Mac OS 9 drivers installed, the drive can be put into a Macintosh that can boot under Mac OS 9, or an ATA/IDE drive can be put into a suitable FireWire enclosure.
The possibility that you may need to remove these two journaling files under Mac OS 9 is a good reason for making sure that all volumes you use have Mac OS 9 drivers installed. The drivers must be installed when the drive is formatted.
--- [END] QUOTE ---
Well, my disk is part of a RAID 5 matrix.... so the solution proposed does not work.
Does any one of you has any idea ?
XServe Mac OS X (10.3.9)

I've seen an article about volumes not mounting and was wondering if this relates to your problem;
http://discussions.apple.com/thread.jspa?messageID=1239224&#1239224
The thread doesn't refer to journalling but may be of use?
HTH

XServe RAID volume does not mount

Without any modification to the system, a panic log from our XServe indicates:
"Thu Jan 18 17:28:58 2007
panic(cpu 0): HFS: corrupt VH on PBSRaid1, sig 0x4100, ver 0, blksize 0"
The volume PBSRaid1 does not mount anyway from that date.
Diskutil reports:
"Verifying volume “disk2s3”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Invalid extent entry
The volume PBSRaid1 needs to be repaired.
Volume check failed."
DiskUtil is unable to repair the volume.
My configuration is:
XServe bi-G3 1GHz, MacOSX Server 10.3.9
XServe RAID with 5 disks RAID5 on the left side (OK) and 4 disks RAID5 on the right side (the bad volume)
All the controls are "green" and nothing wrong appeared in the events log obtained via RAID ADmin.
Any suggestion to repair are welcome, as we have many data from confocal microscopy on that volume.
Thanks
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Right, Dave.
DW 4 rebuilt a preview folder which contains all the files in correctly named folders.Only 3 files among thousands has been saved in a Rescue folder !
It also restored the right volume label, lost in DiskUtil, fsck, pdisk and others.
Very nice tool.
While DW was building its preview, the disk 9 lighted red and a lot of failures of the controler 2 appear in the events log of the XServe RAID.
At this time, the RAID is rebuilding with our spare disk.
I think we have to change both the disk 9 and the controler 2 despite it lights green currently.
Jean-Pierre
XServe RAID (2003- 5xIBM 180Go RAID 5) +(2005 -4xHitachi 250Go RAID5) Mac OS X (10.3.9)

Nifty scroll script still not fast enough

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from time import time
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_arg = -1
length = 20
cmd = ""
enter_cmd = False
flags = ("-l")
for arg in sys.argv[1:]:
if enter_cmd or (arg not in flags and _arg not in flags):
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exit(1)
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alternatively
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mpc_status="|$(scrollout -l 20 mpc current) ($(mpc | grep -Eo '[0-9]*\:[0-9]*\/[0-9]*\:[0-9]*')) "
I find it works nicely, but is a bit slow. Not surprisingly, since it has to re-import all of it's libraries every time it gets launched. To be a truly useful script I imagine it would have to be able to finish it's task in less than one second. Right now it's just above that, ofcourse somewhat depending on what command is being piped through it. The big timestealer, however, is the module imports (according to the python profiler). Having a pretty limited experience of programming, I would like to know if anyone knows of a good workaround for this. Perhaps some way to speed up the module imports or to mimic some of the functionality of these modules without having to import them?
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Mach

Thanks a lot guys! Glad to see such enthusiasm. :-)
juster: But I don't know C! :-) Oh well, I'm working nights, so I have time to learn.
Rewrote the script in python based on juster's algorithm:
#!/usr/bin/python3
from time import time
import sys
w = 20
if len(sys.argv) > 1: w = sys.argv[1]
s = sys.stdin.read().replace("\n","") + (" " * int(w/3))
if len(s) > w:
i = int(time() % w)
while len(s[i:]) < w: s += s
s = s[i:i+w]
print(s)
Then wrote a small bash script to run each of the different variants a hundred times and output their average execution time. Brace yourselves...
The script originally posted:
# mpc current | runtime10 scrollout.py | grep nanoseconds
Average run time: 0 seconds (205726798 nanoseconds)
Roughly the same script, frozen with cx_freeze:
# mpc current | runtime10 scrollout | grep nanoseconds
Average run time: 0 seconds (166651145 nanoseconds)
The perl script submitted by juster:
# mpc current | runtime10 ./perlscrollout | grep nanoseconds
Average run time: 0 seconds (24679770 nanoseconds)
The python script from this post:
# mpc current | runtime10 ./pythonscrollout | grep nanoseconds
Average run time: 0 seconds (190167249 nanoseconds)
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Dropped frames only on xserve raid

dropped frames only on xserve raid
i'm not able to capture on xserve raid without dropped frames. tihis was a working sytem bud one morning it dosn't work. i capture on mac pro internal drives or external fw drives without problems.
the xserve raid is new formated in raid level5 [mac os extended journaled and striped in raid 0 extended] and the risult of kona system test are 178mb/sec write and 167mb/sec read.
must bee enought for 8bit uncompressed pal, no? also if i divide the stripe set the system dosn't work on both controler. i tried also to change the fibrechannel cables!
i checked also the fibrechannel card with expansion slot utility and the message is that runns at maximum speed.
there are no error message on raid admin, the xserve raid appears ok.
i'm shure that the fcp settings are ok, i know the list that regard dropped frames from apple.
i'm desperate, can you help?
thanks jochen
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osx 10.4.10
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aja io (driver 3.0)
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I'm capturing in 10-bit to avoid loss of quality from analog sources like BetaCam SP as well as line 21 must be part of the captured file, because it contains line 21 for captioning. Eight bit has a banding issue that I can't have in the final product and 10-bit doesn't have this issue.
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Current xserve raid speed rate not fast enough

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