glc650

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Everything posted by glc650

  1. I hope they mean the backup/copied file might get corrupted and not the source/original?
  2. But what would it do with the data it was moving when the write started? Just continue moving it in the background while the new writes occur?
  3. What happens when a move is underway and a client pc starts writing data to the array?
  4. Thanks BobPhoenix I think I got it now. Another question...can a cache drive be added after the fact or does it have to be present when the array is being built for first time? What are the options for managing the cached data? Can the data move be scheduled at different times?
  5. But the reverse is true? Makes sense to have 7200 rpm parity with 5400 rpm data drives?
  6. So your saying the data gets copied from the cache drive to the array in real time (while data is still being copied to the cache)? Yea I've had good luck with the WD blacks and SEs in my Synology so was planning on sticking with them if I stay with 7200 rpm. I guess the 7200 rpm drive would only benefit me the most during a drive rebuild then?
  7. Unless you do lots of concurrent writes the 7200rpm parity drive could be changed out to WD Red NAS drive as well. If you want to maximize the speed of your cache drive because of Apps you might consider a SSD instead of a spinner. If you just want to speed up writes to the array then even the WD Red would out perform the network speed you could get without bonding or 10GB networking. If the 7200rpm drives you are considering are 800GB platters or less then the Red Nas drives will out perform the 7200rpm drives for large media files. So you might be able skip 7200rpm completely. Only time there could be significant concurrent writes is during backups which are usually at night when I'm asleep or during the day when I'm working so really doesn't matter I guess. The drives I'm considering are the 3 and 4 TB black and SE NAS (blue). http://www.wdc.com/en/products/products.aspx?id=1050 http://www.wdc.com/en/products/products.aspx?id=760 And I don't see anything about platter sizes for those drives on the WDC site.
  8. Given these responses it sounds like I would be wasting money then on an all 7200 rpm system and should save the 7200 rpm drives for cache and parity and use something like WD Red NAS drives for data? You mean on the same server as unRAID but outside of the unRAID OS? Does unRAID have an option to setup a cache or parity mirror?
  9. Understood. I would be using it to replace my drobo which right now is just a backup to my Synology. I recently had the volume crash on my Synology and had to restore my data from my drobo and it was pretty slow going so just looking for something with better performance (and while I'm at it more options).
  10. LACP is in the GUI. VLAN is done in the switch.That would make it a host/access port and not a trunk port. Trunks have to be configured on both ends. 40-60 Mbps on writes directly to the array. Writes to a cache drive and reads should be limited by the particular disks performance. LACP will not allows a single TCP session to exceed 120MBps. It may be useful if multiple readers are accessing distinct disks.I assume you mean 40-60 megabytes per second? That seems slow. I can basically saturate a single 1GB link on my Synology NAS with one client (and no option for cache disk) at ~100MBps. Even the Drobo 5N can do 60-70 MBps (and Drobos are known for being slow). Is this some sort of software limitation with unRAID?
  11. 1) Dual parity support? I believe the first time I came across unRAID this feature was being considered. Whatever happened to it? 2) Is LACP and VLAN trunking/tagging supported? From what I can gather on the forum LACP is and turnking is not but I haven't seen any recent webGUI pics or an official detailed feature list. 3) According to here http://lime-technology.com/wiki/index.php/UnRAID_Add_Ons#rsync_.28remote_file_sync.29 rsync is included Is this through GUI or command line? 4) What kind of read/write performance could I expect with 5 or 6 7200 rpm drives (either WD black or WD SE NAS), a Core i3 (possibly i5 if it makes sense?) and 8GB RAM? Would just a single NIC (no LACP) hold this system back? Thanks, ->g.
  12. I'm a bit confused after reading this and looking at the spec page for the AOC-SASLP-MV8. According to Super Micro's web site, this card is an "8-channel SAS/SATA adapter with 300MB/s per channel" and "as a 3rd generation SAS/SATA storage card, the AOC-SASLP-MV8 offers double the data transfer rate of its 1st generation counterpart." 300 MB/s x 8 ports means this card would need 2400 MB/sec from the PCIe x4 slot. 1000 MB/s is far from that but abviously today's HDD aren't hitting any where near that so this is a moot point anyway. I'm wondering what the gen 3 reference means though. Do they mean PCIe v3 by that (in which case each lane would be 1 GB/s and that would actually be 4x the bandwidth of gen/version 1)?
  13. How does the bandwidth per drive/port break down with a setup like this? 8 drives on one PCI-E x4 controller seems like a lot. Thanks, -g.
  14. glc650

    new build check

    Thanks for the replies all. Regarding the RAM, any point in getting 4 CAS RAM instead of 5 in my case? What about bandwidth? I was looking at 800 since the CPU's FSB will only be 800. For the PS, the ENERMAX MODU82+ EMD525AWT 525W should be more than enough for me then. As for HDD racks, I think I'll stick with the one bay I-Stars because they are trayless, cost considerably less than a couple of 3 or 4 HDD racks, and either SATA or molex power can be used. Plus, all the trayless multi-HDD racks seem to use smaller fans. I think I'd have more flexability in balancing noise vs. CFM with larger case fans (even if I must add some), especially with the Centurion 590. EDIT: This is the RAM I'm now considering.
  15. glc650

    new build check

    I won't need more than 6 drives anytime soon. I will not be streaming media with this server. It will be strictly used to backup some video from a camcorder and data from my two computers. Reason I picked this HDD is because of the reviews it was getting. I looked at the 750GB and 1TB and reviews seemed a bit disappointing. Plus I'm not all that concerned about maximizing space (especially since unRAID is so flexible). Is there some unRAID features in the future that will use the 2GB of RAM? Is there currently a big performance gain (and even with the CPU I'll be using)? I was worried about cooling with the 3 or 4 in 1 racks. I was thinking I'd use the open racks I have listed above and spread out the 6 hard drives over the 9 bays available. Then add more 120mm or 140mm case fans as needed. Wouldn't that be better than having 4 hard drives that close together with a single 120mm fan on the back? I selected it because of its passive cooling and low profile. Thought that would make it perfect for a server like this. I don't have any GigE network equipment or computers. Is there still a benefit to a GigE NIC in the unRAID server?
  16. Hello, Here's what I was thinking for an unRAID box: case: COOLER MASTER Centurion 590 RC-590-KKN1-GP PS: I was thinking either ENERMAX MODU82+ EMD425AWT 425W / ENERMAX MODU82+ EMD525AWT 525W or SeaSonic M12II SS-430GM 430W / SeaSonic M12II SS-500GM 500W but not sure what I need with six 640GB drives (and the ability to upgrade them over time to 1TB and beyond). trayless rack: iStarUSA T-5-SA motherboard: GIGABYTE GA-EP35-DS3R CPU: Intel Celeron 440 Conroe-L 2.0GHz RAM: CORSAIR XMS2 1GB (2 x 512MB) DDR2 800 mushkin 2GB (2 x 1GB) DDR2 800 vid card: GIGABYTE GV-NX72G512E1 GeForce 7200GS PCI Express x16 HDD: Western Digital Caviar SE16 WD6400AAKS 640GB (6) unRAID: Server Plus (won't need more than 6 drives) extras: I'll evaluate what I need in the way of additional cooling (80mm vs. 120mm vs. other fans) and hard drive cables once I get the system built. EDIT: Will be using this unRAID server for nightly/weely backups of data (Ghost images, email, My Documents, etc.) from my two computers and (in the near future) as storage for some camcorder video (non-HD, probably no more than 10 hrs worth). Right now I have two external hard drives (120GB and 160GB) that I use for data backups (and that's plenty of space for me for that) but that obviously wont be enough storage for camcorder video. This server will not be used to stream media or as storage for a huge library of music or movies. TIA> -g
  17. Are you referring to the trayless Kingwin 3 in 2?
  18. Any idea which ones are used in the pre-built MD-1500/LL server? I can't tell if they are trayless.
  19. So this is a new feature? Is this in the beta versions only? Where can I read more about it? What other units are popular? Anyone use Addonics? http://www.addonics.com/products/raid_system/#diskarray Which ones? What kind of a performance boost does that yield?
  20. Yup that's definitely one reason why I decided to look more closely at unRAID. That's the catch for me, most of the data I'd be putting on an unRAID system would be irreplaceable.
  21. I'm not a storage expert that's why I'm spending the time to have a look well before I even need to make a purchase. And that's why I registered and posted questions.
  22. Sorry, I misread it. In that case wouldn't the ability to house multiple arrays under one unRAID server be a rather important/desireable feature since 16 drives in an array must be rather risky? Anyone actually have a 16 drive array? What's the chance of losing multiple drives at once or in a relatively short time frame?
  23. Wrong... one parity drive can protect any number of data drives. unRaid can currently handle 16 drives in its array. One parity and 15 data. So unRaid is "limited" to 15 Terabytes using 1TB drives. Joe L. Maybe I misread the requirments. I thought I read somewhere that the parity drive has to be greater than or equal to the data drives?
  24. How about a firewire enclosure instead? I've found external firewire hard drive enclosures to be quite a bit faster than USB 2.0. Right, I understand in the end it might not make sense due to cost. I haven't committed to buying/building an unRAID server just yet. Just exploring my options because in the near future (probably later this year) I'll need reliable mass storage. I've been getting by with a couple of external firewire enclosures and just upgrading the drives as needed and using software to backup one drive to the other but eventually that's not going to cut it. So without addtional hardware for the "workarounds" mentioned above, basically the best one can hope for with an unRAID server is 1TB of data since the largest single drive (for parity) available today is 1TB, right?