[vdr] mdadm software raid5 arrays?
linuxtv at nzbaxters.com
Fri Nov 6 19:38:03 CET 2009
I've been running logical volume management (LVMs) on my production VDR box
for years, but recently had a drive failure. To be honest, in the ~20 years
I've had PCs in the house, this is the first time a drive failed!
Anyway, I've bought 3x 1.5 TB SATA disks which I'd like to put into a
software (mdadm) raid 5 array.
I've found a few sites which talk about performance tuning, such as
increasing the read-ahead from 128k:
echo 1024 > /sys/block/sda/queue/read_ahead_kb
And adjusting queue and scheduler depths:
echo 256 > /sys/block/sda/queue/nr_requests
echo 128 > /sys/block/sda/device/queue_depth
And running cfq as the scheduler:
echo cfq > /sys/block/sda/queue/scheduler
But does anyone have any production VDR experience with mdadm - good or bad?
I regularly record 3 and sometimes 4 channels simultaneously, while watching
a recording. Under regular LVM, this sometimes seemed to cause some "slow
My machine is a x86 64 bit dual core AM2, running on a Gigabyte motherboard.
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