What is block size for dma transfers? Can it be set?

Can't find Application Note 011, "DMA Fundamental on Various PC Platforms" on the NI website.
Can someone please send me the link?
What I'm trying to figure out is what is the packet size (chunk size) for DMA transfers on NI M series boards?
i.e. how many samples are collected into the boards FIFO buffer before
DMA transfer takes place. (How many samples (or bytes) are
transferred at a time?)
Is this packet size (chunk size) configurable? If so , what is minimum value that it can take on?
Thanks,
Maurice

See post at http://forums.ni.com/ni/board/message?board.id=170&message.id=162527.

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Minimum block size for DMA transfers

Can't find Application Note 011, "DMA Fundamental on Various PC Platforms" on the NI website.
Can someone please send me the link?
What I'm trying to figure out is what is the packet size (chunk size) for DMA transfers on NI M series boards?
i.e. how many samples are collected into the boards FIFO buffer before
DMA transfer takes place. (How many samples (or bytes) are
transferred at a time.
Is this packet size (chunk size) configurable? If so , what is minimum value that it can take on?
Thanks,
Maurice

See post at http://forums.ni.com/ni/board/message?board.id=170&message.id=162527.

Software RAID0 for Video Editing+Storage: What Stripe Block Size ?

Hi
I'm planning to setup a raid0 with 2x 2TB HDD's to store and edit the videos from my digital camera on it. The most files will have a size of 5 to 15GB. In the past i had raid0's on RHEL with the (old) default stripe block size of 64kb. Since the new drive will only contain very big files would it be better to go with 512kb stripe block size ? 512 is also the default setting now in the gnome disk utility which i use for my partitions.
Another question: Does the so called "raid lag" exist ? I think i've seen occasional stuttering in movies when they're played from a raid0/5 without cache enabled in the player (with cache its fine). Games also seem to occasional freeze when installed on raid (I had this problem in the past with wine games installed on raid0, they sometimes freeze when they try to load data which never occurred ever on a normal HDD).
Many thanks in advance for your suggestions

That is a hard question to answer.. Nothing is best for everyone... However if i am to generalize it I would put it this way.. If you want to cut everything from a short promos to hollywood pictures..
A high end windows pc (only cause mac pro hasn't been updated in ages)
Avid Media Composer with Nitrus DX
Two monitors
Broadcast monitor
HD Deck
pimping 5.1 speakers
A good mixer
You are looking at over 70,000 or 80,000, could even approach even more.. HD decks run atleast 15k.
If price is not an issue then there you go....
However this is not realistic for most people nor best solution by no means... I run a macbook pro with Avid (as primary) Final Cut 7, Final Cut X (for practice, didn't have to use it for a job yet), and Premiere (just in case)
I am a final cut child who grew up on it and love it however everything I am doing in last few years is on AVID...
Have a second monitor..
I am very portable and rest of the gear I usually get where ever I work at.. I am looking into getting a good broadcast monitor connected with AJA thunderbolt..
Like I said this is very open question, there is no (BEST) it all depends what you will be doing.. If you get AVID (which can do everything, however is cluncky as **** and counter intuitive) but you are only cutting wedding videos and short format stuff, it would be an overkill galore.. Just get FCP X in that case... Simple,easy, one app...
Be more specific and you will get clearer answers..

ORA-00349: failure obtaining block size for '+Z' in Oracle XE

Hello,
I am attempting to move the online redo log files to a new flash recovery area location created on network drive "Z" ( Oracle Database 10g Express Edition Release 10.2.0.1.0).
When I run @?/sqlplus/admin/movelogs; in SQL*Plus as a local sysdba, I get the following errors:
ERROR at line 1:
ORA-00349: failure obtaining block size for '+Z'
ORA-06512: at line 14
Please let me know how to go about resolving this issue.
Thank you.
See below for detail:
Connected.
SQL> @?/sqlplus/admin/movelogs;
SQL> Rem
SQL> Rem $Header: movelogs.sql 19-jan-2006.00:23:11 banand Exp $
SQL> Rem
SQL> Rem movelogs.sql
SQL> Rem
SQL> Rem Copyright (c) 2006, Oracle. All rights reserved.
SQL> Rem
SQL> Rem NAME
SQL> Rem movelogs.sql - move online logs to new Flash Recovery Area
SQL> Rem
SQL> Rem DESCRIPTION
SQL> Rem This script can be used to move online logs from old online
log
SQL> Rem location to Flash Recovery Area. It assumes that the database
SQL> Rem instance is started with new Flash Recovery Area location.
SQL> Rem
SQL> Rem NOTES
SQL> Rem For use to rename online logs after moving Flash Recovery
Area.
SQL> Rem The script can be executed using following command
SQL> Rem sqlplus '/ as sysdba' @movelogs.sql
SQL> Rem
SQL> Rem MODIFIED (MM/DD/YY)
SQL> Rem banand 01/19/06 - Created
SQL> Rem
SQL>
SQL> SET ECHO ON
SQL> SET FEEDBACK 1
SQL> SET NUMWIDTH 10
SQL> SET LINESIZE 80
SQL> SET TRIMSPOOL ON
SQL> SET TAB OFF
SQL> SET PAGESIZE 100
SQL> declare
2 cursor rlc is
3 select group# grp, thread# thr, bytes/1024 bytes_k
4 from v$log
5 order by 1;
6 stmt varchar2(2048);
7 swtstmt varchar2(1024) := 'alter system switch logfile';
8 ckpstmt varchar2(1024) := 'alter system checkpoint global';
9 begin
10 for rlcRec in rlc loop
11 stmt := 'alter database add logfile thread ' ||
12 rlcRec.thr || ' size ' ||
13 rlcRec.bytes_k || 'K';
14 execute immediate stmt;
15 begin
16 stmt := 'alter database drop logfile group ' || rlcRec.grp;
17 execute immediate stmt;
18 exception
19 when others then
20 execute immediate swtstmt;
21 execute immediate ckpstmt;
22 execute immediate stmt;
23 end;
24 execute immediate swtstmt;
25 end loop;
26 end;
27 /
declare
ERROR at line 1:
ORA-00349: failure obtaining block size for '+Z'
ORA-06512: at line 14
Can someone point me in the right direction as to what I may be doing wrong here - Thank you!

888442 wrote:
I am trying to drop and recreate ONLINE redo logs on my STANDB DATABASE (11.1.0.7)., but i am getting the below error.
On primary, we have done the changes., ie we added new logfile with bigger size and 3 members. When trying to do the same on Standby we are getting this error.
Our database is in Active DG Read only mode and the oracle version is 11.1.0.7.
I have deffered the log apply and cancelled the managed recovery, and dg is in manual mode.
SQL> alter database Add LOGFILE GROUP 4 ('+DT_DG1','+DT_DG2','+DT_DG3') SIZE 1024M;
alter database Add LOGFILE GROUP 4 ('+DT_DG1','+DT_DG2','+DT_DG3') SIZE 1024M
ERROR at line 1:
ORA-00349: failure obtaining block size for '+DT_DG1'First why you are dropping & recreating online redo log files on standby.
On standby only standby redo log files will be used. Not sure what you are trying to do.
here is example how to create online redo log files, Check that diskgroup is mounted and have sufficient space to create.
sys@ORCL> select member from v$logfile;
MEMBER
C:\ORACLE\ORADATA\ORCL\REDO03.LOG
C:\ORACLE\ORADATA\ORCL\REDO02.LOG
C:\ORACLE\ORADATA\ORCL\REDO01.LOG
sys@ORCL> alter database add logfile group 4 (
2     'C:\ORACLE\ORADATA\ORCL\redo_g01a.log',
3     'C:\ORACLE\ORADATA\ORCL\redo_g01b.log',
4     'C:\ORACLE\ORADATA\ORCL\redo_g01c.log') size 10m;
Database altered.
sys@ORCL> select member from v$logfile;
MEMBER
C:\ORACLE\ORADATA\ORCL\REDO03.LOG
C:\ORACLE\ORADATA\ORCL\REDO02.LOG
C:\ORACLE\ORADATA\ORCL\REDO01.LOG
C:\ORACLE\ORADATA\ORCL\REDO_G01A.LOG
C:\ORACLE\ORADATA\ORCL\REDO_G01B.LOG
C:\ORACLE\ORADATA\ORCL\REDO_G01C.LOG
6 rows selected.
sys@ORCL>
Your profile:-
888442
     Newbie
Handle:      888442
Status Level:      Newbie
Registered:      Sep 29, 2011
Total Posts:      12
Total Questions:      8 (7 unresolved)
Close the threads if answered, Keep the forum clean.

Choosing block size for RAID 0 & Final Cut

Hi.
I now have 3 500GB internal Seagate drives in bays 2/3/4 and want to make a striped 1.5TB RAID to use with Final Cut Studio 2. The help page talks about choosing a "large" data block size for use with video, but makes no specific size suggestion. What value would you recommend that I select for the block size? I haven't been in there yet so I don't know what the choices are.
Any other settings I should be aware of that will optimize the RAID performance for video capture and editing? Thanks!
Fred
Message was edited by: FredGarvin
Message was edited by: FredGarvin

If you're using Disc Utility to set up your RAID, when you go to the RAID tab, you'll see an options button near the bottom of the window... clicking this will open a small menu where you can set the data block size... the largest is 256K, which is what you'd want to use.
As for you're other question... have a look at this website: http://bytepile.com/raid_class.php
note that disc utility can only set up RAID 0 & RAID 1 (if i remember rightly).

Using large block sizes for index and table spaces

" You are not using large blocksizes for your index tablespaces. Oracle research proves that indexes will build flatter tree structures in larger blocksizes.
Is this a generic statement that I can use for all tables or indexes? I also have batch and online activity. My primary target is batch and it should not impact online. Not sure if both have common tables.
How to find the current block size used for tables and index? is there a v$parameter query?
What is an optimal block size value for batch?
How do I know when flatter tree str has been achieved using above changes? Is there a query to determine this?
What about tables, what is the success criterion for tables. can we use the same flat tree str criterion? Is there a query for this?

user3390467 wrote:
" You are not using large blocksizes for your index tablespaces. Oracle research proves that indexes will build flatter tree structures in larger blocksizes.
Is this a generic statement that I can use for all tables or indexes? This is a generic statement used by some consultants. Unfortunately, it is riddled with exceptions and other considerations.
One consultant in particular seems to have anecdotal evidence that using different block sizes for index (big) and data (small) can yield almost miraculous improvements. However, that can not be backed up due to NDA. Many of the rest of us can not duplicate the improvements, and indeed some find situations where that results in a degradation (esp with high insert/update rates from separated transactions).
I also have batch and online activity. My primary target is batch and it should not impact online. Not sure if both have common tables.
How to find the current block size used for tables and index? is there a v$parameter query?
What is an optimal block size value for batch?
How do I know when flatter tree str has been achieved using above changes? Is there a query to determine this?
What about tables, what is the success criterion for tables. can we use the same flat tree str criterion? Is there a query for this?I'd strongly recommend that you
1) stop using generic tools to analyze specific problems
2) define you problem in detail ()what are you really trying to accomplish - seems like performance tuning, but you never really state that)
3) define the OS and DB version - in detail. Give rev levels and patch levels.
If you are having a serious performance issue, I strongly recommend you look at some performance tuning specialists like "http://www.method-r.com/", "http://www.miracleas.dk/", "http://www.hotsos.com/", "http://www.pythian.com/", or even Oracle's Performance Tuning consultants. Definitely worth the price of admission.

Optimal NTFS block size for Oracle 11G on Windows 2008 R2 (OLTP)

Hi All,
We are currently setting up an Oracle 11G instance on a Windows 2008 R2 server and were looking to see if there was an optimal NTFS block size. I've read the following: http://docs.oracle.com/cd/E11882_01/win.112/e10845/specs.htm
But it only mentioned the block sizes that can be used (2k - 16k). And basically what i got out of it, was the different block szes affect the max # of database files possible for each database.
Is there an optimal NTFS block size for Oracle 11G OLTP system on Windows?
Thanks in advance

Is there an optimal NTFS block size for Oracle 11G OLTP system on Windows?ideally FS block size should be equal to Oracle tablespace block size.
or at least be N times less than Oracle block size.
For example - if Oracle BS=8K then NTFS BS better to be 8K but also can be 4K or 2K.
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Default block size for UFS format in OSX?

Hi,
I formatted an external drive as "unix format" (UFS) using Disk Utility, which subsequently became unrecognizable by the firewire controller. Now in a Unix box, the superblock of this drive is coming up as corrupted or nonexistent. Does anyone know where I can find the default block size for UFS in os x? I need to specify a backup superblock. Thanks!
-Dan

If it is just scratch, run some benchmarks with it set to 128k and 256k and see how it feels with each. The default is too small, though some find it acceptable for small images. For larger files you want larger - and for PS scratch you definitely want 128 or 256k.

Optimal Block Size for Xserve's RAID hosting Final Cut Server

What would be the optimal block size for the software RAID on the machine that will be hosting Final Cut Server? The default is 36K. Since FCS is essentially a database, would be the optimal settings? Any glimpse what data size chunks FCS write to the disk?

Actually I meant the block size for the internal startup volume where FCS is installed, not Xsan volumes. As to optimal settings for Xsan volumes it really depends on the type of the data you store on Xsan, and if it is primarily video, what format: SD, HD.

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What is block size for dma transfers? Can it be set?

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