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Forum Discussion
Readynas NV+ SLOW TRANSFER SPEED
ReadyNAS NV+
RAIDiator 4.1.15
4x 1TB WD Green
Raid 5
PC is gigbit, but my transfer speed maxes out at 12MB/sec. I've tried connecting directly to the NAS, and no change in speed. Jumbo frames is diabled on pc and nas. No smart+ errors. Cables are tested and good. Any other suggestions? Just used NAS Tester and the top write speed was under 11MB/sec.
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Is the NAS also showing 1 gigabit for the ethernet connection?
FWIW, this is slower than usual, but you won't get anywhere close to gigabit speed with an NV+. You should be seeing something around 20 MB/s.
My PC and ReadyNAS show gigabit when I go into my modem. I've also tried connecting directly to the readynas with an ethernet cable (cat6, brand new).
No backup jobs, and no addons. I transfer using CIFS. I've also used NAStester and had the same results. I've tried with jumo frames enabled, and disabled on both my pc and readynas.
Can you use this guide to check block size and 4K alignment? http://www.rnasguide.com/2011/06/22/why-you-might-want-to-factory-reset-a-sparc-readynas/
NAStester uses CIFS btw.
- I'll begin backing up my NAS today after work (2pm cst). I don't doubt this could be the issue and I'll look at the logs tonight to verify. Thank you for the link and information.
Normally lack of 4K alignment hurts performance with 2 TB drives, not the 1 TB models you are using. Though it might impact performance with newer 1 TB disk models too - it depends on how they are constructed. The block size would only be an issue if the volume was created using RAIDiator 3.x firmware.
But if the volume is very old, you might find that a factory reset will improve the performance anyway.
Another place to look is at the network stats. If you are seeing ethernet errors or dropped packets, that is a clue that the issue is network related.
- I've had the ReadyNAS for quite a few years. Home was struck by lightning and had to replace the ReadyNAS about 4 months ago because the ethernet port was fried by the lightning. Swapped the drives to the new readynas and I didn't lose any data. I've done a firmware update, but I'm going to back everything up starting today (about 1.7 TB) and start from scratch to see if it makes a difference. I'm using raid 5,would you recommend a different raid setup?
Astiran wrote:
I'm using raid 5,would you recommend a different raid setup?The NV+ actually uses RAID4 (dedicated parity disk) - the GUI does call it RAID5 though.
RAID5/XRAID is a good setup.
Astiran wrote:
...the ethernet port was fried by the lightning. Swapped the drives to the new readynas and I didn't lose any data.I'm glad you didn't. As I'm sure you know, you easily could have. Likely the NIC card acted like a fuse, and protected the drives.
- I was very lucky in that aspect, and only paid $140 for the new readynas. Should have set up a remote connection to my pc so I could have started transferring everything off while I'm at work. Hindsight..
I didn't realize that it doesn't actually use raid 5. I do need the redundancy to protect my data, but is there a difference between the raid 5 and xraid? Or is it just a different name?
Astiran wrote:
I didn't realize that it doesn't actually use raid 5. I do need the redundancy to protect my data,It has the same redundancy as RAID-5. The only difference is the organization of the parity blocks. RAID-5 distributes the parity blocks over all the disks, RAID-4 puts them all on a dedicated parity disk. Distributing the blocks evens out the I/O across the disks. Your NV+ has hardware acceleration for RAID, and I think that is why it uses RAID-4.
Newer NAS (NV+ v2, ultra, pro, all OS 6 NAS) use RAID-5.
Astiran wrote:
is there a difference between the raid 5 and xraid?XRAID is built on top of standard RAID. In your NAS it will convert from single disk->raid 1->raid 4 as you add drives. If you upgrade all four drives, it will also expand the volume automatically. As you likely know, the NV+ can't handle drives larger than 2 TB.
On newer NAS, it can also handle drives of different sizes, and (if you want it) dual redundancy.
Found this in my partition logs.
WARNING: GPT (GUID Partition Table) detected on '/dev/hde'! The util fdisk doesn't support GPT. Use GNU Parted.
Disk /dev/md0 doesn't contain a valid partition table
Disk /dev/md1 doesn't contain a valid partition table
Disk /dev/md2 doesn't contain a valid partition tableDisk /dev/hdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000Device Boot Start End Blocks Id System
/dev/hdc1 32 4096031 2048000 fd Linux raid autodetect
Partition 1 does not end on cylinder boundary.
/dev/hdc2 4096032 5144607 524288 fd Linux raid autodetect
Partition 2 does not end on cylinder boundary.
/dev/hdc3 5144608 1953508815 974182104 fd Linux raid autodetect
Partition 3 does not end on cylinder boundary.Disk /dev/hde: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0x00000000
- No switch, bridge, or router (except for the xfinity modem/router)
Odd. Is the “xfinitywifi" network running?
- No, I shut that feature off the day I setup the modem.
- I did clear it last night but I haven't checked it since. I'll do that when I get back home.
I did check it yesterday but forgot to post back here. Here's the current results:
VLAN tags 19
TCP Retransmits 2
Unrecovered TCP Retransmits 1
Everything else is still showing 0
Well, something must be sending them, but I can't think of an easy way to isolate it.
I don't think the TCP retransmits are enough to explain the slow speeds, and we aren't seeing any sign of packet loss or cabling issues in your stats.
Are you doing all the testing from a single PC? If you have a second one, it might be worth seeing it gives the same results.
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