Hi
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: #default 128 echo 256 > /sys/block/sda/queue/nr_requests #default 256 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 downs".
My machine is a x86 64 bit dual core AM2, running on a Gigabyte motherboard.
Thanks Simon