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тАО07-08-2004 03:14 PM
тАО07-08-2004 03:14 PM
NAS 2000s slow writing files to disk
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тАО07-13-2004 04:56 AM
тАО07-13-2004 04:56 AM
Re: NAS 2000s slow writing files to disk
MANY questions, but first a bit of information. I am guessing there is an MSA30 attached due to 1.6TB. This will use the onboard RAID controller (5i) that has 64MB cache. That is not a very large cache to be working with for large file performance, but for file sizes of less than 1GB (2000s ships w/ 1GB RAM) performance should be good. As soon as the file size exceeds the amount of system RAM (Windows System Cache), performance will drop expectedly.
-You mention 1 gig port on the router. Are you really linked right up to a routing device or is it just a switch? Routing will affect performance (slightly, though).
-You write about 100MB files taking 1 minute normally, but 4-5 minutes with the 2000s. 100MB/min is pretty terrible performance for gigabit any way you look at it. 100bT connections are capable of about 500MB/min with all of the ethernet overhead taken into consideration. 1000bT connections are theoretically capable of 5GB/min (simply 10x of 100bT). In our testing we have yet to fully saturate a 1000bT network connection like a 100bT. With synthetic benchmark tests it is easy to do, but we have done real-world stuff. The most we have been able to get on a 1000bT link is 3-4GB/min from several clients. Also, a single SCSI disk is capable of well over 100MB/min transfer rate (real world). 120MB/min would be just 2MB/sec and that is easy to do with a single SCSI or IDE disk (especially taking into consideration that system cache - remember, RAM - will buffer transfers).
-There is something else going on - networking would be a guess from the limited info in the post. Easy test would be to take an XP client and use a crossover cable to connect directly to the 2000s. The XP client should be able to push well over 100MB/min and the 2000s should be able to handle anything a single XP client can throw at it. It would be a shock if the performance from even a single client to the 2000s is not 100s of MB/min (maybe even near 100bT saturation - about 500MB/min)
Please supply some more info and let us know.
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тАО07-15-2004 06:54 AM
тАО07-15-2004 06:54 AM
Re: NAS 2000s slow writing files to disk
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тАО07-15-2004 06:55 AM
тАО07-15-2004 06:55 AM
Re: NAS 2000s slow writing files to disk
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тАО07-15-2004 11:11 AM
тАО07-15-2004 11:11 AM
Re: NAS 2000s slow writing files to disk
I've been working with Keith on this one. I'm not totally clear about what works and what doesn't. Your second to last message makes it sound like the Extreme 48 is part of the problem and that only the 2000s has problems when connected to it? Or is it when the laptop is connected to the 48 that *only* the 2000s is slow (I get the perception from your messages that the 2000s *does* perform well, but not in all configurations). Just a few points to offer you before I request your clarifications. First, it'd be easy to configure a share on the local OS drive to test against. This is only 2 disks that are mirrored (lower performance), but should be able to provide over 100MB/min performance. If performance is still slow, we still need to troubleshoot to root cause. If performance improves, then we can suspect the 5i, 5i settings, background initialization or something else 5i specific. Second, we run 100%/0% for the read/write cache settings on the 2000s because the cache is not battery backed. In the event of a power failure you could lose/corrupt data. The 25/75 you have configured should, by all means, improve write performance, though. Please clarify and we'll work on an answer as quick as possible
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тАО07-15-2004 01:08 PM
тАО07-15-2004 01:08 PM
Re: NAS 2000s slow writing files to disk
Here is what I have tested. On the Extreme Black Diamond I setup a port to be on the same VLAN as our servers or a different VLAN setup for DHCP and I can read and write under 1 minute easy to the Raid 5 drives. When I connect to an any Extreme 48 switch that is connected by fiber to the Extreme Black Diamond the responce time is slow writing, 3.21 minutes for a 92 meg file verse 1 minute or less to the old DL 380 file server running Windows 2000. I used ethereal to get dumps from writing to new and old file server. All the numbers look better for the new file server then the old one execpt SMB "Write andX". That seems to be the bottleneck. My Network packet guys are out of the office till Monday for me to ask them to look at the dump files. I am not a network guy so I really don't know what that means and how to fix it. I really appricate all your help.
Jason
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тАО07-15-2004 01:11 PM
тАО07-15-2004 01:11 PM
Re: NAS 2000s slow writing files to disk
The Nas 2000s is connected to the Black Diamond cooper gig port. I have been using my XP Dell laptop connected to either the Black Diamond or Extreme Summit 48 switch, 10/100 ports.
I will try creating a share on the mirrored drive to see what that does.
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тАО07-19-2004 10:16 AM
тАО07-19-2004 10:16 AM
Re: NAS 2000s slow writing files to disk
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тАО07-26-2004 04:15 PM
тАО07-26-2004 04:15 PM