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Author Topic: Slow NAS  (Read 10714 times)

mdntblu

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Slow NAS
« on: March 26, 2010, 05:31:13 PM »
Ok this is weird.  I'm not sure what is going on.

I had to get new hard drives since my other one went bad and I read reviews and decided to just turn them in for new ones while I had warranty.

So I got the NAS all back up and running again.
Loaded the newest Firmware.
Setup everything and see it from my computers.

Then I created all the users, and shares.
Setup the Raid as Mirroring.

Now when I copied the first set of files to it seemed to be super fast over Gigabit.

Now whenever I copy anything I'm getting like 1.50mb/sec and it takes forever to just copy like 4GB.  4GB Should take like 2 min.

Any pointers?  Both computers and NAS is setup with Jumbo Frames 4k.

Switch is a Netgear Blue 8-port gigabit switch.

Thanks
Brad

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mdntblu

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Re: Slow NAS
« Reply #1 on: March 26, 2010, 05:34:24 PM »
I even tried copying a 5mb jpg file from the NAS to my desktop and it is going 24 KB/sec and says it will take 4 min.

On Windows 7 64-bit by the way.
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redant2u

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Re: Slow NAS
« Reply #2 on: March 27, 2010, 05:33:30 AM »
I'm sitting on win 7 32bit and currently moving 896.7Gig form a DNS323 at 6.47 to a DNS343, on 1000 LAN with a DGS-1216T in between - don't know if it is worth any thing... :-X
« Last Edit: March 27, 2010, 05:38:08 AM by redant2u »
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gunrunnerjohn

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Re: Slow NAS
« Reply #3 on: March 27, 2010, 07:16:56 AM »
Something is clearly wrong, for large files I get around 15-16mbytes/sec to the DNS-323.  Other folks claim much faster speeds, but I don't know how they do it. :)
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Microsoft MVP - Windows Desktop Experience
Remember: Data you don't have two copies of is data you don't care about!
PS: RAID of any level is NOT a second copy.

mdntblu

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Re: Slow NAS
« Reply #4 on: March 27, 2010, 02:30:21 PM »
ARGH,

I know until this thing crashed several weeks ago and I rebuilt the whole thing it's been slow.  I have a Buffalo Linkstation Live LS-CHL right next to it and can transfer a 2 GB movie to it in no time.  I know it's the NAS and not my computer/network setup.

Any ideas on what i can do to fix it?  I really want to just sell it and buy something else. I've had horrible experience with it and the tech support of d-link is HORRIBLE.  They don't want to admit that anything is wrong with their products.  I spent close to 4 hours at different times over the course of 5 days with them on the phone trying to get them to just replace the device and they won't do it.
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gunrunnerjohn

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Re: Slow NAS
« Reply #5 on: March 27, 2010, 02:49:24 PM »
Did you do a factory reset?  That seems to be a cure-all for a lot of ills this box develops.
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Microsoft MVP - Windows Desktop Experience
Remember: Data you don't have two copies of is data you don't care about!
PS: RAID of any level is NOT a second copy.

mdntblu

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Re: Slow NAS
« Reply #6 on: March 27, 2010, 03:03:56 PM »
Factory reset has been done just before I started rebuilding the entire thing.
I have wasted way too much time on this device. So not worth it.
Doing another factory reset and not sure why I have to do a factory reset so often?
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mdntblu

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Re: Slow NAS
« Reply #7 on: March 27, 2010, 03:09:45 PM »
yeah there is definitely something wrong with this thing. I have just completed another factory reset and a rebuild of the RAID and it hardly let's me copy to it.

Anyone want to buy it?
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gunrunnerjohn

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Re: Slow NAS
« Reply #8 on: March 27, 2010, 03:18:19 PM »
Quote
Anyone want to buy it?
I don't think I like the advertising copy. :D
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Microsoft MVP - Windows Desktop Experience
Remember: Data you don't have two copies of is data you don't care about!
PS: RAID of any level is NOT a second copy.

m2k3423

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Re: Slow NAS
« Reply #9 on: March 28, 2010, 03:08:56 AM »
Hi, have you checked if the RAID is actually in the process of re-sync ? 

A resync will happen whenever the DNS323 is not shutdown from the front panel or the web configuration.  The re-sync will consume close to > 80MB/s and everything to the disk will be extremely sluggish.  The first file is fast probably because it got cached in the  system memory before flushing out to the disk.

If both the HDD activity LED keep flashing even if you did not transfer files to the NAS, it is most likely a resync that is hurting your transfer rate.
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fordem

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Re: Slow NAS
« Reply #10 on: March 28, 2010, 09:58:12 AM »
Quote from: m2k3423 on March 28, 2010, 03:08:56 AM
Hi, have you checked if the RAID is actually in the process of re-sync ? 

A resync will happen whenever the DNS323 is not shutdown from the front panel or the web configuration.  The re-sync will consume close to > 80MB/s and everything to the disk will be extremely sluggish.  The first file is fast probably because it got cached in the  system memory before flushing out to the disk.

If both the HDD activity LED keep flashing even if you did not transfer files to the NAS, it is most likely a resync that is hurting your transfer rate.

Where did you come by this quaint notion - in three plus years of owning a DNS-323 in a RAID1 configuration, I have NEVER had it resync on power-up after an improper shutdown.  I could also be wrong on this, but 80MB/s??  I don't think the disk interface can deliver that much throughput.
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RAID1 is for disk redundancy - NOT data backup - don't confuse the two.

gunrunnerjohn

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Re: Slow NAS
« Reply #11 on: March 28, 2010, 03:27:13 PM »
After a crash shutdown (removing the power), I've seen it think about the array for a short period, then decide it was OK.
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Microsoft MVP - Windows Desktop Experience
Remember: Data you don't have two copies of is data you don't care about!
PS: RAID of any level is NOT a second copy.

m2k3423

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Re: Slow NAS
« Reply #12 on: March 28, 2010, 11:50:40 PM »
Well, if the power was removed suddenly when none of the drive is writing, you are lucky.  Otherwise, you bet there will be a re-sync. In fact, prior to 1.08, the ext2 will also likely need a fsck.   If you do not trust me, try it out, it is not very difficult to duplicate this one  ;D

On the 80MB/s: yes, DNS323 can sync at this rate with 7200rpm SATA2 drives. You can observe this only by getting into the box and checking out /proc/mdstat.  In fact, this is one of the strength of the DNS323 SATA controller. On a typical PC with a PCI SATA controller, one can easily expect about 75MB/s re-sync with 7200rpm SATA2 drives, the bottleneck is the PCI bus.
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fordem

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Re: Slow NAS
« Reply #13 on: March 29, 2010, 04:42:25 AM »
Quote from: m2k3423 on March 28, 2010, 11:50:40 PM
Well, if the power was removed suddenly when none of the drive is writing, you are lucky.  Otherwise, you bet there will be a re-sync. In fact, prior to 1.08, the ext2 will also likely need a fsck.   If you do not trust me, try it out, it is not very difficult to duplicate this one  ;D

You missed my point - been there, done that - and unless there has been a change made to the firmware recently (1.06 or later), it does not resync, and does not do an fsck at power up as most linux distros do.

Quote
On the 80MB/s: yes, DNS323 can sync at this rate with 7200rpm SATA2 drives. You can observe this only by getting into the box and checking out /proc/mdstat.  In fact, this is one of the strength of the DNS323 SATA controller. On a typical PC with a PCI SATA controller, one can easily expect about 75MB/s re-sync with 7200rpm SATA2 drives, the bottleneck is the PCI bus.

Again been there, done that, and if I recall correctly, the numbers are significantly less.
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RAID1 is for disk redundancy - NOT data backup - don't confuse the two.

fordem

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Re: Slow NAS
« Reply #14 on: March 29, 2010, 04:54:39 AM »
Quote from: fordem on March 29, 2010, 04:42:25 AM
You missed my point - been there, done that - and unless there has been a change made to the firmware recently (1.06 or later), it does not resync, and does not do an fsck at power up as most linux distros do.

I take that back - with 1.09 it does resync - earlier versions did not, I'm not certain when this was added.
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RAID1 is for disk redundancy - NOT data backup - don't confuse the two.
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