Re: raid10 performance question

2007-12-25 Thread Peter Grandi
On Sun, 23 Dec 2007 08:26:55 -0600, Jon Nelson [EMAIL PROTECTED] said: I've found in some tests that raid10,f2 gives me the best I/O of any raid5 or raid10 format. Mostly, depending on type of workload. Anyhow in general most forms of RAID10 are cool, and handle disk losses better and so on.

Re: raid10 performance question

2007-12-25 Thread Peter Grandi
On Tue, 25 Dec 2007 19:08:15 +, [EMAIL PROTECTED] (Peter Grandi) said: [ ... ] It's the raid10,f2 *read* performance in degraded mode that is strange - I get almost exactly 50% of the non-degraded mode read performance. Why is that? [ ... ] the mirror blocks have to be read from the

raid10 performance question

2007-12-23 Thread Jon Nelson
I've found in some tests that raid10,f2 gives me the best I/O of any raid5 or raid10 format. However, the performance of raid10,o2 and raid10,n2 in degraded mode is nearly identical to the non-degraded mode performance (for me, this hovers around 100MB/s). raid10,f2 has degraded mode performance,