ccoager

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About ccoager

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  1. I'm trying to architect a large storage server build and am wondering how much processing power is required? I want to know what the minimum processor requirements are to power N number of hard drives without affecting hard drive performance. Is there a ratio of CPU speed/core to HDD quantity? At what speed and number of cores would I need to power 20 hdd's? 40? 100? 200? What about ssd's? I'm looking for some sort of ratio. Could anyone help answer this riddle?
  2. ccoager

    Storage Question

    I can't really say which is the cheapest but here is the compatibility matrix for storage vendors. http://www.vmware.com/resources/compatibility/search.php?deviceCategory=san
  3. Not sure if you knew this or not but you won't be able to get more than 1gbit with multiple NIC's in a 1:1 relationship unless you are using round robin as your algorithm. If that is your goal, link aggregation will do nothing for you.
  4. ccoager

    Hard drive prices

    I've never seen a Toshiba or Samsung desktop drive, have you? Do they have plans to release drives in the desktop market?
  5. ccoager

    Hard drive prices

    Prices have started to drop although they are still very high compared to pre-flood. The Hitachi 5400rpm 3tb drive is 67% higher than the pre-flood price as of today. I'm also concerned that there are only two desktop manufacturers left. Makes me wonder if they are price gouging.
  6. There are two important things the article didn't touch on. First, with TRIM enabled, doesn't this make recovery impossible as it wipes empty blocks repeatedly? Second, data retention/decay on 25nm is only a few months. Data can be wiped completely if the ssd is offline for too long.
  7. ccoager

    best drive cage

    I'm looking for the best internal drive cage. I'm looking for something that fits in a 5.25" slot that is cheap, SATA III compatible (6gbps), hot-swap, is multi-bay and has an activity LED. Here are a few examples of what I'm looking at: Thermaltake MAX-2533 http://www.thermaltakeusa.com/Product.aspx?C=1257&ID=2032 ICY Dock MB455SPF http://www.icydock.com/goods.php?id=48 Super Micro CSE-M35T-1 http://www.supermicro.com/products/accessories/mobilerack/CSE-M35T-1.cfm Any other good ones out there? Thoughts?
  8. I am looking to build a new server soon and use a lot of hard drives. I have found that economically speaking, external enclosures are much more expensive and also limited in bandwidth. Now I am considering large computer cases for the job. I am leaning towards the Lian Li 343b case. Back to my price point, the Lian Li 343b case is ~$350 for 18 5.25" bays, which can be expanded. A quick Google search reveals that an 8 bay RAID enclosure would cost ~$479. So for about half the slots you are paying more, does that make any sense? Are there any comparable cases to the Lian Li 343b with a lot of drive bays? Are there any cons to this case?
  9. They are just the retailer. The chipset used in this port multiplier, Silicon Image, doesn't seem to have a SATA 600 port multiplier chipset.
  10. I'm looking for an external SATA port multiplier host with 6gbps uplink. I don't mean a PCI card that plugs into the computer, I'm looking for the other end which would fit in an external enclosure that hosts hard drives only. Here is an example of one that is limited to 300MB/s: http://www.amazon.com/Addonics-eSATA-Serial-Multiplier-AD5SARPM/dp/tech-data/B000VEMNAU Do any exist yet?
  11. ccoager

    DIY SAN Questions

    If you are running VM's I would not go with SATA, you should be looking into SAS instead. VM's use a lot of IOPS and SATA will be very painful. Also, you need to make sure the VM's are aligned.
  12. ccoager

    Building storage with supermicro 846TQ

    Well, to satisfy your goal, your best bet is RAID 5 or 6. You need to be careful which hard drives you buy as some of the SATA drives have low URE's that would prevent your RAID from ever being rebuilt with larger storage sizes. It looks like you wouldn't run into that issue with the Seagate Constellation drives though. More RAM will help, depending on your OS. Linux uses RAM for file system cache. I believe Windows Server can do this as well if you enable an option. If you ask me for software recommendations, I'll always suggest Linux. You should check out ext4 or xfs. Enabling write back with a battery backup will achieve high write speeds. What kind of applications are you running on this? This is good for high capacity, good transfer speeds but not good for IOPS.
  13. ccoager

    SAN forum

    Thanks Brian!
  14. To check alignment, show the output of this command, fdisk -lu XFS is a good choice but I think ext4 is slightly faster. If you do go with XFS you should format it properly. If you plan on using extended attributes for ACL's you need to format with larger inodes or your ACL's will be in separate inodes than the actual file. This could be viewed as a format of fragmentation and cause a performance hit on every single file using ACL's. Here is what I use when formatting XFS: mkfs.xfs -f -i size=1024,attr=2 -l version=2,size=128m,lazy-count=1 The -i size=1024 is for large ACL's, if you aren't using large ACL's this isn't necessary. To check the scheduler, show the output of this command, cat /sys/block/<device>/queue/scheduler
  15. ccoager

    48 tb server help

    Instead of one big RAID make more smaller ones. If you're using RAID 5, make sure you're raid set is smaller than 12tb.