Hello all,
I'm experimenting with the experimental sata_mv driver in the
2.6.15-rc5-mm kernel.
I've found it works but its rather flakey and fails a lot (I'll be
posting seperate information on this in another post)
I've just created a raid 5 array as a test made up of 5 x 250 GB sata
Sebastian Kuzminsky [EMAIL PROTECTED] wrote:
Question 1: Why didnt the raid sync I/O show up with vmstat?
Question 2: Why was it limited to 17 MB per second? The maximum was
left at the default, 200 MB/s. The min was also at the default, 1 MB/s.
I get 60 MB/s per disk with hdparm -tT
I just created a RAID array (4-disk RAID-6). When mdadm -C returned,
/proc/mdstat showed it syncing the new array at about 17 MB/s. vmstat 1
showed hardly any blocks in or out, and an almost completely idle cpu.
Question 1: Why didnt the raid sync I/O show up with vmstat?
I switched to iostat
Andrew Burgess [EMAIL PROTECTED] wrote:
Question 1: Why didnt the raid sync I/O show up with vmstat?
I switched to iostat because of similar observations with vmstat. iostat
at least shows you which devices it is looking at and it agrees with
/proc/mdstat's numbers in my experience.
Right.
I'll just call it sync access pattern overhead then.
As another data point, I've been adding more and more
drives to a RAID-1 array. Yesterday I just added a fourth
disk which is still syncing.
mdadm --grow /dev/md0 -n4
mdadm --manage /dev/md0 --add /dev/sde
md0 : active raid1
On Tuesday December 20, [EMAIL PROTECTED] wrote:
I'm seeing hard system lockups with 2.6.15-rc5 when trying to use a
RAID-6 array as a PV for LVM2.
I've got four SATA disks hanging off a Marvell 6081 controller. The disks
work great when I access them raw (without going through md or dm).
On Sunday December 18, [EMAIL PROTECTED] wrote:
The raid (md) device why dont have scheduler in sysfs?
And if it have scheduler, where can i tune it?
raid0 doesn't do any scheduling.
All it does is take requests from the filesystem, decide which device
they should go do (possibly splitting
- Original Message -
From: Neil Brown [EMAIL PROTECTED]
To: JaniD++ [EMAIL PROTECTED]
Cc: Al Boldi [EMAIL PROTECTED]; linux-raid@vger.kernel.org
Sent: Wednesday, December 21, 2005 2:40 AM
Subject: Re: RAID0 performance question
On Sunday December 18, [EMAIL PROTECTED] wrote:
The
Neil Brown [EMAIL PROTECTED] wrote:
On Tuesday December 20, [EMAIL PROTECTED] wrote:
I'm seeing hard system lockups with 2.6.15-rc5 when trying to use a
RAID-6 array as a PV for LVM2.
alt-sysrq-P ?
alt-sysrq-T ?
Didn't try P or T, but my normal mantra of S-U-B had no effect. I can
try P
