NFS read ok, write ok, simultaneous R+W=TERRIBLE
Subsystems (2)
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Sounds like you are not using the 3ware card for anything other than just an IDE controller right?
Exactly - I'm using it to give me SCSI JBOD.
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There is a linux-ide-raid mailing list -- with good info. I've seen people run raid 5 on the 3ware card and then use SW raid to stripe 2 3ware cards. RAID 51 of sorts.
I follow this list - no help as my disks are FAST. I'm using RAID 0+5 truth be known. Every pair of drives is striped in software. That gives me 7 really fast drives (14 spindles striped in pairs). Then, I S/W Raid 5 those together. All done with EVMS. So, 1 parity and 6 data basically.
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Also there was a pretty good IDE raid review today:
I saw this cool article. My disks are *FAST* on R/W and R+W. My NFS is great on read, great on write, but just dies on read + write. Hence the conundrum.
Neil or Trond - any clues?
Thanks,
Jake
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