raid 5 terribly slow

[mineblaster]

running raid 5 off x99 chipset and it is painfully slow it hover around 10mb/psec ive added an ssd cache but no real diffrence

 

is there an setting im missing in intel RST

[leadeater]

3 hours ago, mineblaster said:

running raid 5 off x99 chipset and it is painfully slow it hover around 10mb/psec ive added an ssd cache but no real diffrence

 

is there an setting im missing in intel RST

This is normal for onbaord RAID 5, never use it. RAID 1 and RAID 0 perform fine.

 

If you require RAID 5 you have three choices.

1. Software RAID, change the SATA port mode back to AHCI. (Performance will still be fairly crap)

2. Windows Storage Spaces, change the SATA port mode back to AHCI.

3. Buy a RAID card that has a battery backup module to allow for write-back caching.

 

Write-back cache is required for parity RAID configuration to perform properly, without it as you are experiencing it is not realistically usable. 

[mineblaster]

2 hours ago, leadeater said:

This is normal for onbaord RAID 5, never use it. RAID 1 and RAID 0 perform fine.

 

If you require RAID 5 you have three choices.

1. Software RAID, change the SATA port mode back to AHCI. (Performance will still be fairly crap)

2. Windows Storage Spaces, change the SATA port mode back to AHCI.

3. Buy a RAID card that has a battery backup module to allow for write-back caching.

 

Write-back cache is required for parity RAID configuration to perform properly, without it as you are experiencing it is not realistically usable. 

its a working partion and is half full

[leadeater]

4 minutes ago, mineblaster said:

its a working partion and is half full

That is rather unfortunate, only thing you can really do is backup and reconfigure storage to something else that isn't so slow. There is no fix or configuration change you can do to make onboard RAID 5 any faster than what you are getting.

[mineblaster]

i do have an adaptec 1680i laying around should i use that

 

 

2 hours ago, leadeater said:

That is rather unfortunate, only thing you can really do is backup and reconfigure storage to something else that isn't so slow. There is no fix or configuration change you can do to make onboard RAID 5 any faster than what you are getting.

http://www.tomshardware.com/reviews/16-port-sas-controller,2249-5.html

 

[leadeater]

9 minutes ago, mineblaster said:

i do have an adaptec 1680i laying around should i use that

 

It would be much faster yes, got the battery for it? Will need that else you'll have to force write-back cache on which isn't really safe to do. It will be faster without it anyway.

 

You may not be able to import the current RAID 5 array to it so could still be a backup and restore requirement anyway. Would only persist with RAID 5 if you really need it. Windows Storage Spaces works very well but you would have less usable space, using two way mirror since parity config in this is terrible performance too (about 30MB/s). Just mindful of adding more cards to the computer and compatibility. My 10Gb network card causes my 2nd GPU to run in x8 mode, not a problem just annoying.