Write through on external hdd making writing very slow
I use an external USB hard drive as seconday storage system, but the write
through policy make it very slow.
I think it's possible to scan the vendor info to know if it's an harddrive and
disable the write through and enable write back policy.
scsi0 : SCSI emulation for USB Mass Storage devices
Vendor: HDS72258 Model: 0VLAT20 Rev: 0 0
Type: Direct-Access ANSI SCSI revision: 02