March 11, 201412 yr I put a new cache drive in a few weeks ago and most of the time when I copy files to any of my shares (which I've confirmed are indeed going to cache drive first) the speeds are painfully slow. Most of the time I'm getting between 10-15MB/s but sometimes it's as bad as 4-5MB/s. Every now and then I'm getting upwards of 45-50MB/s but those are rare occasions. I was getting slow transfers on my last cache drive as well before I replaced it (I upgraded for a bigger drive). Thoughts? I don't see anything in the logs for me to post since when I do the transfers it's going right to the cache drive so nothing is being written to the array yet.
March 11, 201412 yr What are your read speeds like? Many users who have reported bad speeds have subsequently found that it was a network issue where the LAN was only running at 100MB. This was due to a variety of issues from dodgy cabling to problem port on the router. Was is not commonly known is that Gigabit cables need more working connectors than 100MB ones, so sometimes the LAN appears to be working but due to the cable not meeting the GB requirements it is running slower than expected.
March 11, 201412 yr Author What are your read speeds like? Many users who have reported bad speeds have subsequently found that it was a network issue where the LAN was only running at 100MB. This was due to a variety of issues from dodgy cabling to problem port on the router. Was is not commonly known is that Gigabit cables need more working connectors than 100MB ones, so sometimes the LAN appears to be working but due to the cable not meeting the GB requirements it is running slower than expected. Read speeds between 68-88MB/s. I really don't think it's a network issue. All my stuff is new (within the past few months). New HP-v1910G switch, all new cat6 cables, and both my servers (VMware and UnRAID) are running on new SuperMicro boards.
March 11, 201412 yr Sounds like a faulty CAT 6 cable, switch port, NIC, switch, router port, or router. Test and isolate. Start by connecting the server directly to the client. A standard CAT 6 cable will work, Gig-e does not require a cross-over.
March 11, 201412 yr Author Sounds like a faulty CAT 6 cable, switch port, NIC, switch, router port, or router. Test and isolate. Start by connecting the server directly to the client. A standard CAT 6 cable will work, Gig-e does not require a cross-over. Wouldn't faulty network equipment cause slow writes AND reads?
March 11, 201412 yr Sounds like a faulty CAT 6 cable, switch port, NIC, switch, router port, or router. Test and isolate. Start by connecting the server directly to the client. A standard CAT 6 cable will work, Gig-e does not require a cross-over. Wouldn't faulty network equipment cause slow writes AND reads? Nope.
March 11, 201412 yr Author Sounds like a faulty CAT 6 cable, switch port, NIC, switch, router port, or router. Test and isolate. Start by connecting the server directly to the client. A standard CAT 6 cable will work, Gig-e does not require a cross-over. Wouldn't faulty network equipment cause slow writes AND reads? Nope. Don't quite understand that but I guess the only faulty equipment it could be is the cat6 from my UnRAID server to my switch or the NIC in my server itself. Seeing as I get the same exact performance whether I write to it from any of my 3 Windows boxes, the server itself seems to be the common denominator. Should be quick enough to test out.
March 26, 201412 yr Author After moving my torrent downloads to a VM Datastore on an SSD I'm now seeing the kinds of writes speeds to my array that I was expecting (90-100MB/s). So it looks like the issue was that my downloads were on the cache drive. I guess this causes a huge performance hit when I'd copy from the cache drive to a share in my array via Windows Explorer.
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