I have configured 2x 500G sata HDD as Software RAID1 with three partitions
md0,md1 and md2 with md2 as 400+ gigs
Now it is almost 36 hours the status is
cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 hdb1[1] hda1[0]
104320 blocks [2/2] [UU]
resync=DELAYED
md1 : active raid1 hdb2[1] hda2[0]
4096448 blocks [2/2] [UU]
resync=DELAYED
md2 : active raid1 hdb3[1] hda3[0]
484182912 blocks [2/2] [UU]
[==========>..........] resync = 51.8% (251168768/484182912)
finish=1975.
7min speed=1964K/sec
unused devices: <none>
I have reniced the md2-resync to -10
Q1. Does is take this long?
Q2. How to speed it up
Regards and Thanks
Rajagopal
On Thu, May 7, 2009 at 11:17 PM, Rajagopal Swaminathan < raju.rajsand at gmail.com> wrote:> I have configured 2x 500G sata HDD as Software RAID1 with three partitions > md0,md1 and md2 with md2 as 400+ gigs > > Now it is almost 36 hours the status is > > cat /proc/mdstat > Personalities : [raid1] > md0 : active raid1 hdb1[1] hda1[0] > 104320 blocks [2/2] [UU] > resync=DELAYED > > md1 : active raid1 hdb2[1] hda2[0] > 4096448 blocks [2/2] [UU] > resync=DELAYED > > md2 : active raid1 hdb3[1] hda3[0] > 484182912 blocks [2/2] [UU] > [==========>..........] resync = 51.8% (251168768/484182912) > finish=1975. > 7min speed=1964K/sec > > unused devices: <none> > > I have reniced the md2-resync to -10 > > Q1. Does is take this long? > Q2. How to speed it up >Google: http://www.google.com/search?hl=en&rlz=1B3GGGL_enUS326US326&q=mdadm+resync+speed&btnG=Search -- j -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20090507/d01366be/attachment-0004.html>
Rajagopal Swaminathan wrote:> I have configured 2x 500G sata HDD as Software RAID1 with three partitions > md0,md1 and md2 with md2 as 400+ gigs > > Now it is almost 36 hours the status is > > cat /proc/mdstat > Personalities : [raid1] > md0 : active raid1 hdb1[1] hda1[0] > 104320 blocks [2/2] [UU] > resync=DELAYED > > md1 : active raid1 hdb2[1] hda2[0] > 4096448 blocks [2/2] [UU] > resync=DELAYED > > md2 : active raid1 hdb3[1] hda3[0] > 484182912 blocks [2/2] [UU] > [==========>..........] resync = 51.8% (251168768/484182912) finish=1975. > 7min speed=1964K/sec > > unused devices: <none> > > I have reniced the md2-resync to -10 > > Q1. Does is take this long? > Q2. How to speed it up >depends on your disk controllers. whats `iostat -x 5` say the IO on hdb3 and hda3 is doing? (ignore the first sample, its average since boot, wait for the 2nd and later 5 second samples...). iostat is in the sysstat RPM, sadly, not installed by default. is the md2 filesystem mounted ? it will go faster if there is zero disk activity on the physical drives. 500gb has to be read and written over the SATA channels, which appear to be in IDE mode (hda instead of sda).... figure 60-80MB/sec peak sustainable, lets round that to 50MB/sec, so thats 500000/50 == 10000 seconds if its running at pure wire speed the whole time. if there's -any- disk contention, it will run MUCH slower. if its only running 2MB/sec (as indicated) somethinig is fubar with the disk IO, maybe its in PIO mode, ouch!
Jeremy Rosengren <jeremy.rosengren at ...> writes:> Google:?http://www.google.com/search?hl=en&rlz=1B3GGGL_enUS326US326&q=mdadm+resync+speed&btnG=Search-- j>/proc/sys/dev/raid/speed_limit_min /proc/sys/dev/raid/speed_limit_max [root at localhost ~]# cat /proc/sys/dev/raid/speed_limit_min 10000 [root at localhost ~]# cat /proc/sys/dev/raid/speed_limit_max 1000000 Thanks Rajagopal