MegaRaid 320 raid 10 with stripe (not span)

[damjanster]

A year ago there was a debate going on weather LSI MegaRaid would support "true" Raid 10 (Adaptec-like) with stripping rather than spanning.
Does anyone know weather this feature had already happened?

Performance wise regarding DBs I'd rather use stripping. The spanning only gives you increased capacity, not performance.

MCP, MCSA, MCSA+M, MCSE 2003, RHCE C4

 

[technome]

Lsi Megaraid raid adapters support true raid 10, and have for years.

http://lsionline2.lsil.com/eSupport...uickSearch&bnewsession=false&selecttype=match

........................................
Chernobyl disaster..a must see pictorial

http://www.kiddofspeed.com/default.htm

 

[damjanster]

I know it supports spanning in raid 10. I am also quite familiar with the procedure. Weather this is so called native raid 10 or not is debatable. I know how adaptec makes raid 10 - it uses stripping+mirroring instead of spanning+mirroring. I believe stipping improves performance and increases space whereas spanning only gives you more space (in comparison to ordinary RAID 1 set).
Am I wrong? - I would really love to hear that LSI Megaraid's raid-10 is as fast as adaptec's, many experts told me otherwise since spanning is in use.

MCP, MCSA, MCSA+M, MCSE 2003, RHCE C4

 

[technome]

Stripping and spanning are the same meaning, for a raid 10 setup on an Lsi adapter.
With Lsi adapters, data is written across all disks equally as per stripe size in raid 10 and raid 5. Look at the benchmarks below, these speeds could only be obtained with stripping, with data spread equally over the disks. Notice the speed increases in the benchmarks below with the increase in the number of disks in arrays, this is verification the data is written across all disks..throughput would not increase otherwise.

Tons of benchmarks, site in Dutch but benchmarks English

http://tweakers.net/benchdb/suite/13

http://tweakers.net/benchdb/test/85

........................................
Chernobyl disaster..a must see pictorial

http://www.kiddofspeed.com/default.htm

 

[damjanster]

Thanks! I have also read a manual by FSC that confirms that stripping is used. Now I can use RAID 10 with confidence. The first few generations of LSI raid controllers were using spanning and thus no performance increase was detected. Very happy that they changed this.

MCP, MCSA, MCSA+M, MCSE 2003, RHCE C4