Re: RAID10 far (f2) read throughput on random and sequential / read-ahead

2008-02-23 Thread Keld Jørn Simonsen
I made a reference to your work in the wiki howto on performance. Thanks! Keld On Fri, Feb 22, 2008 at 04:14:05AM +, Nat Makarevitch wrote: > 'md' performs wonderfully. Thanks to every contributor! > > I pitted it against a 3ware 9650 and 'md' won on nearly every account (albeit > on > RAID

Re: mismatch_cnt != 0

2008-02-23 Thread Carlos Carvalho
Justin Piszcz ([EMAIL PROTECTED]) wrote on 23 February 2008 10:44: > > >On Sat, 23 Feb 2008, Justin Piszcz wrote: > >> >> >> On Sat, 23 Feb 2008, Michael Tokarev wrote: >> >>> Justin Piszcz wrote: Should I be worried? Fri Feb 22 20:00:05 EST 2008: Executing RAID health c

Re: RAID10 far (f2) read throughput on random and sequential / read-ahead

2008-02-23 Thread Nat Makarevitch
Nat Makarevitch makarevitch.org> writes: > 'md' performs wonderfully > random access performance remains stable and high (450 > IOPS with 48 threads, 20% writes - 10% fsync'ed), even with a fairly high > read-ahead (16k). Mystery solved, sorry for the noise Explanation: I use the 'randomio' to

Re: RAID5 to RAID6 reshape?

2008-02-23 Thread Nagilum
- Message from [EMAIL PROTECTED] - Date: Fri, 22 Feb 2008 08:13:05 + From: Peter Grandi <[EMAIL PROTECTED]> Reply-To: Peter Grandi <[EMAIL PROTECTED]> Subject: Re: RAID5 to RAID6 reshape? To: Linux RAID [ ... ] * Suppose you have a 2+1 array which is full. Now

Re: mismatch_cnt != 0

2008-02-23 Thread Justin Piszcz
On Sat, 23 Feb 2008, Justin Piszcz wrote: On Sat, 23 Feb 2008, Michael Tokarev wrote: Justin Piszcz wrote: Should I be worried? Fri Feb 22 20:00:05 EST 2008: Executing RAID health check for /dev/md3... Fri Feb 22 21:00:06 EST 2008: cat /sys/block/md3/md/mismatch_cnt Fri Feb 22 21:00:06 E

Re: mismatch_cnt != 0

2008-02-23 Thread Justin Piszcz
On Sat, 23 Feb 2008, Michael Tokarev wrote: Justin Piszcz wrote: Should I be worried? Fri Feb 22 20:00:05 EST 2008: Executing RAID health check for /dev/md3... Fri Feb 22 21:00:06 EST 2008: cat /sys/block/md3/md/mismatch_cnt Fri Feb 22 21:00:06 EST 2008: 936 Fri Feb 22 21:00:09 EST 2008: Exe

Re: mismatch_cnt != 0

2008-02-23 Thread Michael Tokarev
Justin Piszcz wrote: > Should I be worried? > > Fri Feb 22 20:00:05 EST 2008: Executing RAID health check for /dev/md3... > Fri Feb 22 21:00:06 EST 2008: cat /sys/block/md3/md/mismatch_cnt > Fri Feb 22 21:00:06 EST 2008: 936 > Fri Feb 22 21:00:09 EST 2008: Executing repair on /dev/md3 > Fri Feb 22

mismatch_cnt != 0

2008-02-23 Thread Justin Piszcz
Should I be worried? Fri Feb 22 20:00:02 EST 2008: Executing RAID health check for /dev/md0... Fri Feb 22 20:00:03 EST 2008: Executing RAID health check for /dev/md1... Fri Feb 22 20:00:04 EST 2008: Executing RAID health check for /dev/md2... Fri Feb 22 20:00:05 EST 2008: Executing RAID health ch