...
wd0(pciide0:0:0): timeout type: ata c_bcount: 512 c_skip: 0 wd0e: DMA error writing fsbn 2651200 of 2651200-2651211 (wd0 bn 3819472; cn 3789 tn 2 sn 34), retrying wd0: soft error (corrected) wd0(pciide0:0:0): timeout type: ata c_bcount: 0 c_skip: 0 wd0(pciide0:0:0): timeout type: ata c_bcount: 512 c_skip: 0 wd0(pciide0:0:0): timeout type: ata c_bcount: 8192 c_skip: 0 wd0e: device timeout writing fsbn 2651200 of 2651200-2651215 (wd0 bn 3819472; cn 3789 tn 2 sn 34), retrying wd0: soft error (corrected) wd0(pciide0:0:0): timeout type: ata c_bcount: 512 c_skip: 0
did you look into this? anyway, test disk io and network separately. /kami