Harm, looking for a quick answer on a RAID question...

I bought a G-Speed ES drive with the G-Tech RAID card, set up the drive yesterday, initialized it (took 9 hours!) as a RAID-5, and in the initiallization settings window I was asked what sector size I wanted. I did some quick research and found that bigger sectors are better with bigger files, so choose the maximum size available to me under the hardware RAID, which was 4k (I'm assuming that's 4096). Came into the office this morning and found the drive had finished the initilization and that Windows required me to create a "simple volume" on it before it could be used. I'm in the process of doing that, and have found that Windows is asking me to set a sector size again: This time my maximum option is 64k. Do I want to go with the maximum option of 64k, or do I have to use the 4096 which the hardware RAID used in initializing the array?

David,
This may be informative: http://www.tomshardware.com/reviews/wd-4k-sector,2554-3.html
With a sector size or cluster size of 4 KB, data are distributed across the partition in 4 KB parts. Suppose you have a 10 KB file, three full clusters will be occupied: 4 KB - 4 KB - 2 KB. The remaining 2 KB is called slackspace and can not be used by other files. With a block size (stripe) of 64 KB, data are distributed across the array disks in 64 KB parts. Suppose you have a 200 KB file, the first part of 64 KB is located on disk A, the second 64 KB is located on disk B, the third 64 KB is located on disk C and the remaining 8 KB on disk D. Here there is no slackspace, because the block size is subdivided into clusters. When working with audio/video material a large block size is faster than smaller block size. Working with smaller files a smaller block size is preferred.
Sometimes you have an option to set 'Chunk size', depending on the controller. It is the minimal size of a data request from the controller to a disk in the array and only useful when striping is used. Suppose you have a block size of 16 KB and you want to read a 1 MB file. The controller needs to read 64 times a block of 16 KB. With a chunk size of 32 KB the first two blocks will be read from the first disk, the next two blocks from the next disk, and so on. If the chunk size is 128 KB. the first 8 blocks will be read from the first disk, the next 8 block from the second disk, etcetera. Smaller chunks are advisable with smaller filer, larger chunks are better for larger (audio/video) files.
What you see as 'sector size' from Windows is better called the block size and for video you can best choose the maximum, in this case 64 KB.
BTW, also have a look at Adobe Forums: How to access more than 2 TB of disk...

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>> This is my first time on the forums, so please bear with me. I am also a somewhat novice SQL coder but I have a question that I feel might be best answered my the more advanced folks on this forum. <<
Please follow basic Netiquette and post the DDL we need to answer this. Follow industry and ANSI/ISO standards in your data. You should follow ISO-11179 rules for naming data elements. There is no generic “id”, “name, etc. in RDBMS. Tables have to have a key,
but we do not put “_pk” on the name. Read a copy of https://www.simple-talk.com/books/sql-books/119-sql-code-smells/ so you will stop tibbling and other bad practices.
You should follow ISO-8601 rules for displaying temporal data. We need to know the data types, keys and constraints on the table.
Avoid dialect in favor of ANSI/ISO Standard SQL. And do not draw ASCII pictures! They do not compile.
>>The group_id is linked [sic] to the group_table.id [sic] And the member_id can be either linked [sic] back to the group_table or user_table depending on the value of member_type. <<
RDBMS has no links; that was in network databases in the 1970's. No wonder you want to use recursive CTEs; they are cursors
>> It is possible to have nested groups, and each level of nesting can have users as well not just nested groups. Sort Of how the windows group nesting model works. <<
Then you should use a nested sets model. Since you did not post sample data, DDL or correct specs, Google it.
--CELKO-- Books in Celko Series for Morgan-Kaufmann Publishing: Analytics and OLAP in SQL / Data and Databases: Concepts in Practice Data / Measurements and Standards in SQL SQL for Smarties / SQL Programming Style / SQL Puzzles and Answers / Thinking
in Sets / Trees and Hierarchies in SQL

Harm, looking for a quick answer on a RAID question...

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