Re: Raid5 reads and cpu

2006-09-07 Thread Rob Bray
On Monday August 28, [EMAIL PROTECTED] wrote: This might be a dumb question, but what causes md to use a large amount of cpu resources when reading a large amount of data from a raid1 array? I assume you meant raid5 there. md/raid5 shouldn't use that much CPU when reading. It does use

Re: Raid5 reads and cpu

2006-09-07 Thread Rob Bray
Rob Bray wrote: This might be a dumb question, but what causes md to use a large amount of cpu resources when reading a large amount of data from a raid1 array? Examples are on a 2.4GHz AMD64, 2GB, 2.6.15.1 (I realize there are md enhancements to later versions; I had some other unrelated

Re: Raid5 reads and cpu

2006-09-04 Thread Neil Brown
On Monday August 28, [EMAIL PROTECTED] wrote: This might be a dumb question, but what causes md to use a large amount of cpu resources when reading a large amount of data from a raid1 array? I assume you meant raid5 there. md/raid5 shouldn't use that much CPU when reading. It does use more

Re: Raid5 reads and cpu

2006-09-04 Thread Bill Davidsen
Rob Bray wrote: This might be a dumb question, but what causes md to use a large amount of cpu resources when reading a large amount of data from a raid1 array? Examples are on a 2.4GHz AMD64, 2GB, 2.6.15.1 (I realize there are md enhancements to later versions; I had some other unrelated