Re: raid10: unfair disk load?

2007-12-21 Thread Michael Tokarev
Janek Kozicki wrote: > Michael Tokarev said: (by the date of Fri, 21 Dec 2007 14:53:38 +0300) > >>> I just noticed that with Linux software RAID10, disk >>> usage isn't equal at all, that is, most reads are >>> done from the first part of mirror(s) only. > > what's your kernel version? I recall t

Re: raid10: unfair disk load?

2007-12-21 Thread Janek Kozicki
Michael Tokarev said: (by the date of Fri, 21 Dec 2007 14:53:38 +0300) > > I just noticed that with Linux software RAID10, disk > > usage isn't equal at all, that is, most reads are > > done from the first part of mirror(s) only. what's your kernel version? I recall that recently there have b

Re: raid10: unfair disk load?

2007-12-21 Thread Michael Tokarev
Michael Tokarev wrote: > I just noticed that with Linux software RAID10, disk > usage isn't equal at all, that is, most reads are > done from the first part of mirror(s) only. > > Attached (disk-hour.png) is a little graph demonstrating > this (please don't blame me for poor choice of colors and >

Re: Raid over 48 disks

2007-12-21 Thread Leif Nixon
Mattias Wadenstein <[EMAIL PROTECTED]> writes: > There are those that have run Linux MD RAID on thumpers before. I > vaguely recall some driver issues (unrelated to MD) that made it less > suitable than solaris, but that might be fixed in recent kernels. I think that was mainly an issue for peopl

Re: Raid over 48 disks

2007-12-21 Thread Leif Nixon
Norman Elton <[EMAIL PROTECTED]> writes: > We're investigating the possibility of running Linux (RHEL) on top of > Sun's X4500 Thumper box: > > http://www.sun.com/servers/x64/x4500/ I think BNL's evalation of Solaris/ZFS vs. Linux/MD on a thumper might be of interest: http://hepix.caspur.it/s