I recently built a fairly nice NAS system for a customer:
\n0.7 Khasadar (revision 4919)
\n2.5GHz Dual Core Pentium
\n4GB DDR2 PC1066
\n5x hot swap 2TB SATA
\n10\/100\/1000 Intel Pro NIC
\n10\/100\/1000 Full duplex switch connection<\/p>\n
After formatting the drives in SoftRAID 5 (1.8TB x 4 = 7.2TB – 5% for defragmentation = 6.84TB available), I started to backup many of their ISOs and daily computer backups and other logs. Everything was going smoothly using Windows File Sharing (Samba) until I got to the larger files.<\/p>\n
Initially the files would copy at 80+MB\/sec, but then they’d slow down to 50… 30… 20… even down to 8 or so MB\/sec. Ouchies when you’re talking about a 40+GB file to transfer. FTP yielded the same results. I noticed that sometimes the drives on the NAS wouldn’t even be blinking, so it had to be another issue.<\/p>\n
If you login on the web panel of the FreeNAS, under Services you will find CIFS\/SMB.
\nCheck under Advanced Settings
\nYou’ll see Send and Receive buffer sizes – by default they are 16MB (16*1024 = 16384)
\nI changed the buffer size to 128MB (128*1024 = 131072) and checked the results<\/p>\n
120MB\/sec, slow down to 80… 70… 60… So 60MB\/sec. That’s over 6 times faster at a cost of 8 times the RAM. I can live with that.<\/p>\n
So just for jollies I increased it to 512MB and then to 1024MB. Both stopped around 70MB\/sec. Then, as a final test, I dropped it down to 256MB (256*1024 = 262144), which seemed to be OK.<\/p>\n","protected":false},"excerpt":{"rendered":"
I recently built a fairly nice NAS system for a customer: 0.7 Khasadar (revision 4919) 2.5GHz Dual Core Pentium 4GB DDR2 PC1066 5x hot swap 2TB SATA 10\/100\/1000 Intel Pro NIC 10\/100\/1000 Full duplex switch connection After formatting the drives in SoftRAID 5 (1.8TB x 4 = 7.2TB – 5% for defragmentation = 6.84TB available), … Continue reading FreeNAS Slow File Copy<\/span>