Anyone using two SSDs in a RAID0?

Since the price is dropping, I'm wondering if running 2 of these in a RAID0 will amount to anything real that would justify the effort.  An Archers running an array in a RAID0 and care to post a quick benchmark?  Procedure is on the wiki.

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Similar Messages

  • Anyone using an SSD under Arch? Please post a quick benchmark

    I'm considering an SSD for my Linux root and /home.  If you're using an SSD under Arch, can you please run a quick benchmark for me and post the results in this thread?  You can use hdparm to do a quick read test.  Here is an example using my HDD.
    # hdparm -Tt /dev/sda
    /dev/sda:
    Timing cached reads: 14500 MB in 2.00 seconds = 7258.88 MB/sec
    Timing buffered disk reads: 368 MB in 3.01 seconds = 122.16 MB/sec
    Beyond that, have you noticed any substantial speed ups over an HDD, like launching programs, booting the system, etc.

    Perhaps use of IDE-MODE flash devices will provide best answers with the hdparm measure.  It does a sequential test which is hardly normal for operating systems.
    Usual performance from ide mode flash devices is 45mb/sec but in practice may be a bit less in hdparm.  Two ide mode flash drives in raid0 give me less than 90 mb/s.  My use is for quick access storage, mostly read-only.  When first installed, 90 mb is possible but within a few weeks, it lessens to the mid 80"s even with read-only.
    The performance over time lessens if the units are used as SSD and such is normal wear and tear.  Many articles cover the subject and the methods used to minimize the effects.
    Much is going forward with SSD and expectation is that in a few years they will be in wide use.  This remains to be seen!
    You may be aware of all so excuse my oops!

  • Anyone using an SSD? did you align partitions to erase blocks?

    I'm waiting on the 2nd gen Intel SSDs to copy my / and /home to the faster I/O device.  In the meantime, I'm reading up on these things and have found numerous sources that suggest aligning partitions on SSD's to the erase block of the device.  I found two major sources detailing the process.  This one shows a setup using parted and explains the process.
    I'm just posting to solicit feedback from the community on this issue.  Does Aloisio have it right in that blog post?

    Thanks for the link... most of that went over my head though. I'm not too sure about the whole boot 'tricky offset' as you described it though
    My partition scheme for the 80 gig ssd will be pretty simplistic:
    20 gigs of NTFS as partition #1
    15 gigs of ext4 as partition #2
    200 meg of ext3 for /boot as partition #3
    rest of the drive for /home as partition #4
    I'll keep /var and /data partitions on my HDD.
    Glad to hear more comments about this so I can do it right the first time
    Last edited by graysky (2009-08-14 21:35:29)

  • Anyone using two external LCD with a recent MacBook Pro?

    Hello,
    Does Thunderbolt support chaining multiple monitors(e.g. non Apple Thunderbolt Display) to a MacBook Pro?
    A Thunderbolt hub will be required, some external HD have two TunderBolt ports.  A device with three ports will be required (one input, two ouptputs).
    Anyone have seen such device ?

    http://www.matrox.com/graphics/en/solutions/mac/

  • Anyone useing an SSD Drive in a Mac Pro? Should it be Sata? or pci..can it be bootable?

    The Title says it all!
    But to recap, I would like an SSD boot drive for my 3,1 power Mac.....I can get SSD drives in PCE or SATA configuration, which would work better?
    Thanks for any info
    Jim

    EIDE or PATA hasn't been used and of course is way too slow.
    SSDs today are "too fast" for the SATA II we have so you don't need SATA 3, SATA II is still hitting the wall with an SSD.
    You do know that yours should get 250MB/sec but being small you need to cut down on what you store on your boot drive and use other drives for meda and data.
    SATA 3 SSDs can deliver up to 500MB/sec which again is getting close to the max bandwidth of 700MB/sec that the controller chip used in the Mac Pro is capable of, which is shared by all 4 drive bays.
    Many users stick the SSD in the lower optical drive bay. Very convenient. I can't remember if you have an SATA optical drive though or they still used EIDE.

  • Anyone Using An SSD Drive for Audio Yet?

    Been thinking about one of these for my record drive, since a very small one would work for me (as I'm only working on a few songs at any given moment and have plenty of other space to store things). It's between this and getting a V Raptor drive but I love the idea of no moving parts...
    Any input appreciated..
    TH

    Mike Connelly wrote:
    For audio recording, the concern is that SSDs have a lower number of write cycles than traditional hard drives. It's hard to know with such a new category of product, but they may fail faster in a situation where they are being written over and over very often.
    This is a much bigger issue for system disks than for audio recording. Audio deals with relatively large files, and once they're written, they generally stay there until the project is dumped off-disk.
    The system, on the other hand, constantly reads/writes/re-writes tiny blocks of data all over the place - which is also why random read/write rates are EVERYTHING in performance, and sequential read/write speeds, while certainly impressive, are pretty much irrelevant in actual use.
    Also, all SSDs use a kind of "load balancing" to make sure that writes are evenly distributed across the entire memory, resulting in lifespans far beyond anything you'd reasonably expect off a mechanical hard drive.
    Further reading (everything you need to know):
    http://www.anandtech.com/storage/showdoc.aspx?i=3531
    http://anandtech.com/storage/showdoc.aspx?i=3631
    Message was edited by: spheric

  • Can I delete a two SSD Raid 0?

    Attempted to setup a RAID 0 using two SSD drives, using Disk Utility.
    Then tried to use Carbon Copy Cloner to clone an existing bootable internal drive to the new RAID.
    CCC stated that it couldn't do that because one of the drives in RAID had no Recovery Partition.
    Now I cannot delete the RAiD setup to go back and reformat the individual drives to include the Recovery partition.
    Other than being out of my mind, what am I doing wwrong here?
    All this is on a 2012 Mac Pro running Maverick OS.

    I don't know if this will help or not, but I did have a problem in attempting to "De-Construct" a RAID array that got broken somehow and I wanted to change the striping from mirrored (RAID 1) to RAID 0. Since this was a LaCie External Little Bisk 250GB SSD, I wrote to them and received a reply (the Disk Utility application cannot "De-Construct" a RAID array once created by that application, but it can be easily accomplished via Terminal using the Command Line:
    DE-Construct a LaCie Little Bog Disk RAID Array
    From LaCie Technical Support on May 29, 2014
    IMPORTANT NOTE: The procedure below involves the use of the Terminal program. This program, if used incorrectly, can cause data loss, or other problems. Ensure everything is typed precisely to avoid data loss.
    Ensure an up to date backup exists prior to starting this process. It is important to ensure you do not have any other removable drives attached to the computer other than the one we are working with during this process.
    1. Open the program "Terminal". This is within the Utilities folder (MacHD --> Applications --> Utilities)
    In the terminal window, type:
    diskutil list
    then press enter. Ensure this is all lower-case, as everything is case-sensitive within Terminal.
    This command will return a list of all the attached drives on the computer by a unique hardware identifier. (e.g. disk1, disk1s1). At this point, you will need to determine the correct identifier for the drive we are working with.
    2. If you are having problems getting the volume to dismount in Disk Utility, you can use the following command:
    diskutil unmount force (identifier)
    This step is not necessary if the volume for the drive we're working with is already unmounted. In that case, proceed to the next step.
    3. One of the disk identifier entries may show the overall RAID set that was configured on the drives. If that is present, use the following command to remove this item:
    diskutil appleraid delete (identifier)
    Again, if the RAID set is not visible in the listing shown in step 1, then proceed to the next step.
    4. The following command will completely eradicate any remaining header information on the individual disks. This command would need to be done for each disk in the array:
    diskutil zerodisk (identifier)
    Please be very careful when running this command. This will fully wipe all data from the target drive(s). This should, however, clear off the inaccurate header indication on the drive that is incorrectly telling Disk Utility the drive is "broken".
    This process will start a long zero-out procedure on the drive. If you wish to test the hardware integrity of the drive mechanism, you can let this process complete to 100%. If this completes without errors, then we know the hardware of the drive mechanism is completely healthy. This will take several hours to finish on most systems.
    If you do not wish to wait, then you can usually interrupt this process (Control + C will abort this) after a minute or two. The important header information is one of the first things to be erased by this process, so even if interrupted, this command should still correct the problem.
    5. After everything is finished, you should be able to exit Terminal, and go back into the Disk Utility Application to re-configure the RAID array on the device.
    Hope this is helpful,
    Barry

  • How to use the noop scheduler on two SSDs in software RAID mode?

    Hi all,
    I have two SSDs in RAID0 via motherboard ("fake") raid. They're mapped using dm-raid. The root device is /dev/dm-3
    According to: https://wiki.archlinux.org/index.php/Solid_State_Drives, you can do `echo noop >/sys/block/sdX/queue/scheduler`, but that doesn't seem to work for me.
    On my system:
    % cat /sys/block/dm-3/queue/scheduler [1]
    none
    % cat /sys/block/sda/queue/scheduler [1]
    noop deadline [cfq]
    How would I make this RAID0 partition use the noop scheduler?
    Update, setting /dev/sda to use noop worked, but is there a way to apply it to the RAID0 partition only?
    % cat /sys/block/sda/queue/scheduler [1]
    noop deadline [cfq]
    % echo noop | sudo tee /sys/block/sda/queue/scheduler [1]
    noop
    % cat /sys/block/sda/queue/scheduler [0]
    [noop] deadline cfq
    Last edited by solarwind (2012-10-18 23:33:22)

    Someone needs to come out with an interface to do SATA/SAS Thunderbolt.
    One idea, no idea but Barefeats reviewed
    http://www.barefeats.com/hard156.html
    Elmar Weiss Photography's blog posted an excellent review comparing the Drobo 5D Thunderbolt with the Pegasus R6 Thunderbolt enclosure.
    http://www.barefeats.com/imac12d.html
    Look around, Google and always hit Barefeats for such questions in your research

  • Are Apple still using two different SSD drives?

    Hi Everyone
    I am in the process of sorting out an order for a 13" MacBook Air but I have just found out that it would appear that Apple are using two different suppliers for their SSD drives. Alot of the posts about this subject seems to be from a few months a go, and I wondered if anyone has heard anymore info if this is still the case, or if Apple has now switched to one supplier?
    Thanks for any help you can offer

    yes as of three weeks ago, i checked some of the New release diplayed MBA 11 & 13 and they had the old ones in them. TS

  • Troubleshoot Migration Assistant used internally to consolidate two SSDs?

    Hi,
    I'm on a Macbook Pro Mid-2010, where I swapped out the optical drive for an extra disk. Now I have two SSDs, one 256GB with my OS and applications, and one 1TB with my user folder and media and everything else.
    I aim to consolidate everything onto the big 1TB SSD. I backed up with Time Machine, then booted into Recovery, and installed Yosemite onto the 1TB SSD. Then, I think it automatically goes into Migration Assistant, so I just set that to start (Applications and the rest) going from the SSD which previously ran OS X. It went to a screen that says "Transferring Your Information", with the blue time bar underneath. That loaded to completion pretty quickly. But now, it's just sitting on this screen and still says "Starting up..." above the blue bar. It's been like that for about 20 hours. Anyone experienced this? Should I keep waiting or did this process freeze perhaps? The mouse cursor still moves on the screen, so it's not completely frozen anyway.
    It seems it should be relatively quick since it's transferring internally from hard drive to hard drive, where I thought the throughput would be even better than thunderbolt. Is it possible Migration Assistant is just somehow doing it over WiFi anyway because it doesn't know any better?
    Thanks!

    The easiest at this point would be to start over - use recovery (Command + R keys at boot up) to connect to Apple's servers (be patient - takes a while). Once you see the Utilities screen, choose Disk Utility to erase the drive. When done, choose to reinstall OS X. Now, when you get to the screen asking if you want anything moved over, then in your case, I'd say no at this point. Once you set up your iMac which will include you establishing your own Apple ID/password, you can then selectively port over files and such. You can use Migration Assistant in the Applications folder at that point (FWIW, you used Setup Assistant at the beginning?) - the annoying problem with that is that it will move stuff over using your old ID so you'll wind up with a lot of duplicates which then need to be sorted. That's one way, the other is that you move only the files you need (not involving Migration Assistant). Or, backup your files on an external drive and then move them back over once you have everything else reinstalled.
    Please note: anything at all downloaded from the app store is tied to Apple ID used to obtain it forever and is not transferable, so if there are any applications, OS updates, or anything else involved, you will need to re-download or re-purchase using your own Apple ID.

  • Anyone using Lion and Snow Leopard?  I will be soon.

    I will soon be using both Lion and Snow Leopard on my newly upgraded hybrid hard drive.I know that I should need to partition the drive into three 1 for Lion 1 for SL and 1 for data/applications.
    The problem is how is how much space should I give each partition?
    Has anyone done this before or have any good ideas how to go about it?
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    The new drive is 750GB Seagate Momentus XT 7200rpm 8GB(solid-state) hybrid drive
    The soon to be replaced drive is a stock 250GB 5400rpm HDD
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    It's important that you leave a minimum amount of free space for the OS to use. You will see anywhere from 16 to 30 GBs for your OS and iLife apps. You need enough space to allow for all your third-party applications and document files. When fully set up you may have only 30 GBs of free space which is an appropriate amount to have, but not less than 20 GBs. That makes 60 GBs a reasonable minimum size.
    If you haven't put everything in concrete, I might suggest going with a 500 GB Seagate XT hybrid together with a 128 or 256 GB SSD using an OWC DataDoubler replacing the optical drive. I suggest that mainly because using the same hard drive for the OS and Data partitions will actually make file I/O slower. Having two drives and using an SSD for the startup volume will enhance file I/O operations. Only two partitions on the SSD - each 60 GBs - fit neatly in 128 GBs.

  • Can I use two apple ids on my iPhone?

    Does anyone know if I can use two apple ids on my iPhone. Basically I have a problem where I can't download an app because its not available in the Australian store but I am considering starting a new apple id linked to my Hong Kong credit card so I can purchase this app
    app
    if I do this will I only be able to see the apps downloaded using each particular apple id account on my iPhone at any one time...?

    wjosten wrote:
    That only applies if you turn on Automatic Downloads or iTunes match.
    To the OP, you can ignore Philo124's post.
    No, it Applies if you download content from one then switch to another and download content from the other. Automatically or not.
    Apple Wrote:
    Association of Associated Devices is subject to the following terms:
    You may auto-download iTunes Auto-Delivery Content or download previously-purchased iTunes Eligible Content from an Account on up to 10 Associated Devices, provided no more than 5 are iTunes-authorized computers.
    (ii) An Associated Device can be associated with only one Account at any given time.
    (iii) You may switch an Associated Device to a different Account only once every 90 days.
    Not sure if its only limited to past purchases or new ones as well though.

  • Is anyone using testing seeing compiler lock-ups? [SOLVED]

    As the title says, is anyone using testing seeing compiler lock-ups? I've been seeing them for about two or three days. Sometimes the system will hang for a few seconds at "Starting make" with 100% CPU usage, then will continue normally. Other times it will stop in the middle of compiling and CPU usage will drop to 0. Also, I've been seeing small hang ups with patches. Maybe four or five seconds when simple patches are being applied. Bringing MAKEFLAGS down to the default 2 from 3 seems to help a tiny bit.

    fakeroot would put it in the right time frame. I linked to your bug report Anarconda as it seems like the same problem. As always if anyone has anything to add, please do:
    http://bugs.archlinux.org/task/13699

  • Use two different printer services in one web template?

    Hi!
    Is it possible to use two different help services for printing in the same web template (for the same table item)?
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    I was thinking that you maybe could change the param name values for the "Help_service" and the "help_service_class" at runtime using the properties for the table item, so that you could choose which one to use, but I havne't been able to do that so far.
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    This is not a problem. Just put the print service for the print to excel on an object other than the table web item. As long as these print services exist on any web item, you should be able to invoke them. I've tested this with putting the "Print with Excel" service on the Navigation Block Web Item and the other print service on the table web item. Hope that helps!
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  • How to use two different network cards on RT?

    Hi everyone... I'm currently working on a project where I have to deal with the issue mentioned in the thread's topic: I have a PC with RT LabVIEW that has to be able to establish network connections using two different network cards. One will be used to connect via TCP/IP with a host computer that will show the data transmitted through shared variables; the other will communicate with another PC through Modbus protocol. The key is that each communication is done through a separate network card.
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    Go to Solution.

    Sorry it took me so long to answer, I've been busy lately....I've found a solution to the problem I mentioned, and just in case anyone has similar problems in the future, I'll shortly describe what happened.
    As Caseyw suggested, it was necessary to enable both network cards through the Measurement and Automation Explorer. The cause of the connections malfunction was actually that I wasn't using the "right" protocol for the Modbus communication, which ran on the secondary adapter. The solution was to use the URL protocol with the correct path on the field, addressing the right IP address. To avoid making this post a mixture of topics, I won't elaborate futher, but I got the gist of it, so if anyone is having similar problems whether it is working with several network cards or with Modbus communication protocols, feel free to contact me, I'll be glad to help.
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