slow lvm
Hi, I've been having problems with a really slow lvm for a while. I think it started after I had replaced a broken hard disk and done pvmove. I've checked the drives with hdparm and they all seem normal. I've moved all the drives to a similar box and it's still equally slow. I've even added a new drive and created a lvm just on that and it still is very slow and just shows 100% utilisation of the drive but very little throughput (max 30k blocks/second according to munin).
I think the only think all of the configurations that I've tried have in common is that I started off with a linux software raid 1 with one missing drive. So here's my disk layout.
md4 : active raid1 sdd4[0]
1885150680 blocks super 1.2 [2/1] [U_]
--- Logical volume ---
LV Name /dev/vg0/lv0
VG Name vg0
LV UUID BEGmO7-Oi4O-DID5-4qs4-pvMp-1nnD-sHDz53
LV Write Access read/write
LV Status available
# open 1
LV Size 1.76 TiB
Current LE 460241
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:1
This is a fresh install of Debian squeeze. Before changing the disk it was Lenny. Any help really appreciate. I've spent about a month on this now.
Thanks,
mimo
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