I tried to create a raid6 with one missing member, but it fails.
It works fine to create a raid6 with two missing members. Is it supposed
to be like that ?
mdadm -C /dev/md0 -n5 -l6 -c256 /dev/sd[bcde]1 missing
raid5: failed to run raid set md0
mdadm: RUN_ARRAY failed: Input/output error
Justin Piszcz wrote:
I'm suffering from bad performance on my RAID5.
a echo check /sys/block/md0/md/sync_action
gives a speed at only about 5000K/sec , and HIGH load average :
# uptime
20:03:55 up 8 days, 19:55, 1 user, load average: 11.70, 4.04, 1.52
kernel is 2.6.18.1.2257.fc5
mdadm is
I've tried to increase the cache size - I can't measure any difference.
Raz Ben-Jehuda(caro) wrote:
did u increase the stripe cache size ?
On 1/18/07, Justin Piszcz [EMAIL PROTECTED] wrote:
Sevrin Robstad wrote:
I'm suffering from bad performance on my RAID5.
a echo check /sys/block
Steve Cousins wrote:
Sevrin Robstad wrote:
I'm suffering from bad performance on my RAID5.
a echo check /sys/block/md0/md/sync_action
gives a speed at only about 5000K/sec , and HIGH load average :
What do you get when you try something like:
time dd if=/dev/zero of=/mount-point/test.dat bs
Mark Hahn wrote:
Chunk Size : 256K
well, that's pretty big. it means 6*256K is necessary to do a
whole-stripe update; your stripe cache may be too small to be effective.
If they are on the PCI bus, that is about right, you probably should
be getting 10-15MB/s, but it is about right.
I finally got my old RAID-5 up again, after bruteforcing the setup of
it... (A Script that ran mdadm --create --run -n 6 -l 5 /dev/md0
/dev/1-5 missing;fsck -n -f /dev/md0;mdadm --stop /dev/md0;)
The first run didn't find anything that made sense, but desperately I
ran the same script with -c
Neil Brown wrote:
I have written some posts about this before... My 6 disk RAID 5 broke
down because of hardware failure. When I tried to get it up'n'running
again
I did a --create without any missing disk, which made it rebuild. I have
also lost all information about how the old RAID was set
Molle Bestefich wrote:
Sevrin Robstad wrote:
I got a friend of mine to make a list of all the 6^6 combinations of
dev
1 2 3 4 5 missing,
shouldn't this work ???
Only if you get the layout and chunk size right.
And make sure that you know whether you were using partitions (eg.
sda1
I have written some posts about this before... My 6 disk RAID 5 broke
down because of hardware failure. When I tried to get it up'n'running again
I did a --create without any missing disk, which made it rebuild. I have
also lost all information about how the old RAID was set up..
I got a
As I wrote in another thread, because of hardware failure my RAID 5
array crashed. After som rebuilding the array crashed again. I have
built the array again
with the right settings, but it has rebuilt and data is gone - I can not
find any EXT3 partition on the array anymore. Is there any way
Is there not any way for me to recover my data
As I said, i have already rebuilt the raid with wrong disc setup... Now
i have built the raid with the right setup, and one missing disk.
But there's not any ext3 partition on it anymore. Is there any way to
search trough the md0 device and
?
Sevrin Robstad,
Norway
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