Cleanly Remove Storage Tier from Virtual Disk

I have got a tiered Virtual Disk composed of 1 HDD and 1 SSD (just a lab setup). Is there a way to cleanly remove the SSD tier from the virtual disk - I'm guessing marking the tier as readonly then flushing any contents to the HDD tier, then a remove.
I can't seem to see any obvious PowerShell cmdlets to achieve this?

Hi,
I don't think we could remove a tiered virtual disk. See:
Remove-StorageTier
http://technet.microsoft.com/en-us/library/dn454977.aspx
You cannot remove storage tiers that are used by virtual disks.
If you have any feedback on our support, please send to [email protected]

Similar Messages

Clean Reinstall/Must restore from original disks or can I use 10.4

Have pored thru the forums looking for my specific questions but haven't found them - so please bear with more clean reinstall questions ---
1) Yes - I have to do a clean reinstall - much other discussion on other forums has said this is what needs to happen for my particular sick Mac situation - so I already know this....
2) Have already used carbon copy cloner to back up entire hard drive, files et al to an external hard drive...
3) Have iMac G4 - came with OS 10.2.3 - I do not need OS 9 anymore - haven't used it for 2 years, I have the newest Tiger disks and just got iLife 2006 - can I just use those to put my system back on? Or do I need to start from my original iMac Software Install and Restore DVD - and then add on the next versions from their disks till I get to Tiger? (I have all of them - Panther, Puma, Bobcat, Lynx - you name it... Steve Jobs is getting his money's worth out of me)....
4) Someone told me I should erase my hard drive completely with disk utility first - and then do the clean install on a totally virgin hard drive - is this true? I want to do the absolute premium, totally best thing....
5) Should I write down all the info in "About This Computer" first - like serial number etc - does the above option erase all of that?
6) When I do a clean reinstall - should I name my computer and put in my user name and password etc exactly the way it was?
Thanks so much - I really have searched these forums and couldn't find the above -
madmags
iMac superdrive Mac OS X (10.4.4) Lacie external HD 150 GB

1) Yes - I have to do a clean reinstall - much other discussion on other forums has said this is what needs to happen for my particular sick Mac situation - so I already know this....
First off, there is no such thing as a "clean" reinstall. Maybe an erase and install as the rest of your post suggests:
http://discussions.apple.com/thread.jspa?messageID=607614
Secondly, a sick machine rarely needs an erase and install. I use it only to discover right away if there is a hardware issue with the computer as opposed to software.
2) Have already used carbon copy cloner to back up entire hard drive, files et al to an external hard drive...
Have you tested to make sure the clone is bootable?
3) Have iMac G4 - came with OS 10.2.3 - I do not need OS 9 anymore - haven't used it for 2 years, I have the newest Tiger disks and just got iLife 2006 - can I just use those to put my system back on? Or do I need to start from my original iMac Software Install and Restore DVD - and then add on the next versions from their disks till I get to Tiger? (I have all of them - Panther, Puma, Bobcat, Lynx - you name it... Steve Jobs is getting his money's worth out of me)....
You can use the Tiger disks, though I would troubleshoot your problem first before even attempting to install Tiger.
4) Someone told me I should erase my hard drive completely with disk utility first - and then do the clean install on a totally virgin hard drive - is this true? I want to do the absolute premium, totally best thing....
Not necessarily. Once your 10.2 system is healthy, frequently all that is necessary is an Archive and Install:
http://docs.info.apple.com/article.html?artnum=301270
I've seen some cases where this doesn't work, while others where it does. So the first thing is to make sure your system is healthy, then back it up, and then upgrade.
5) Should I write down all the info in "About This Computer" first - like serial number etc - does the above option erase all of that?
The only serial numbers you need are for third party applications, and any Apple pro applications. The operating system has no serial number. This would be in case, you can't restore from your clone when you are finished, and Archive and Install doesn't work.
6) When I do a clean reinstall - should I name my computer and put in my user name and password etc exactly the way it was?
We'll cross that road once we get there. I'd rather make sure you aren't just installing an unhealthy system on an unhealthy system.
Tell me more about your sick system, and maybe we can solve the issue so all that you need to do is make sure your backup is bootable and an Archive and Install.

Removing STORAGE info from dmp

Hi,
I have a problem with a dmp file which was created on Oracle 10.2.0.3.0. I made this export to create a development/test database.
For the export, I used the following option :
file= mydmp.dmp
log=mydmp.log
rows=n
owner=myowner
compress=n
feedback=10000
statistics=none
The problem, I have, is that this export contains all the "STORAGE" options of my production database. I want to remove these informations because the two databases have not the same disk space. The two databases have the same oracle version but the first database is 20 times bigger than the second.
This is why I'd like to know how I could remove the "STORAGE" options by editing the dmp or add an option on the export.
Thanks.
Regards.
Guillaume.

Hi,
I'm using a traditional export "exp user/pwd@db"
The storage option I'm talking about are these ones : "STORAGE(INITIAL 1048576 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)"
I'd like to remove them from my dmp file.
Edit : You mean it'd better if I used an "expdp" instead of "exp". If it's that, I've seen too many times that "expdp" was no longer supported and that it was unrecommended for Oracle >9
Edited by: schgui on 27 janv. 2012 05:10

Clean install of ML from bootable disk, Snow Leopard original OS...

Hi all,
I visited my apple store on Sunday who suggested I should reinstall my operating system from scratch.
My MBP is 2009 and I believe came with Snow Leopard installed on it. I have the original disks that came with it to do a fresh install of Snow Leopard, however I am currently running ML.
Do I need to install Snow Leopard, then Lion then upgrade to ML again or can I just boot and do a clean install straight from the USB?
Any help would be appreciated
Thanks,
Sarah

Do I need to install Snow Leopard, then Lion then upgrade to ML again?
No, it's on a bootable partition now called Recovery HD, hold command r and boot the machine, use Disk Utility to erase the Macintosh HD partition (all files, programs and OS X will be gone) reinstall OS X, you will need a fast internet connection and your AppleID and password.
https://support.apple.com/kb/HT4718
If you don't have a backup, need to perform data recovery BEFORE erasing or reformating the Macintosh HD partiton, then do this, just because OS X isn't booting means you can't access the drive and grab files off.
Create a data recovery/undelete external boot drive
You might be able to fix your problem in place, without a messy erase and install, that's a last option in my book
Run through this and see if it clears your issue, or least gets OSX to boot so you can copy files and important information off first.
Step by Step to fix your Mac
If you have a boot hard drive, when you erase the Macintosh HD partition, use the Security > Erase middle selection as this will improve the drive's data retention. SSD's no need and it's not available.

Removing Password Protection From External Disk Attached to Time Capsule

I have an TV and when I try to watch a show it always says that "file format is not recognized." I am pretty sure it is because my computer gets disconnected from the external disk that all the media is on. This disk is attached to my time capsule. I wish I could make it so it would automatically reconnect with the disk after being disconnected, but I can't figure out how to make the external disk non password protected without making my network password protected also. Does that make sense? How do I make a disk so it is not password protected if it is on my password protected network? If my computer is on the network then I should be able to access discs without having to put in an additional password, no?

I have an TV and when I try to watch a show it always says that "file format is not recognized." I am pretty sure it is because my computer gets disconnected from the external disk that all the media is on. This disk is attached to my time capsule. I wish I could make it so it would automatically reconnect with the disk after being disconnected, but I can't figure out how to make the external disk non password protected without making my network password protected also. Does that make sense? How do I make a disk so it is not password protected if it is on my password protected network? If my computer is on the network then I should be able to access discs without having to put in an additional password, no?

Remove password protection from a disk.

I have a lacie usb drive that I want to use to get video off a simple pc that I video surgery on. (I am a surgeon). I can't do anything to the software on the PC. I have previously set up password protection on the Lacie drive . When I put it into a PC the password dialogue doesnt get launched and the volume is never mounted. I would like to remove the password protection, - can anyone tell me how . Have spent ages with Disk utility and Diskwarrior.

I have previously set up password protection on the Lacie drive .
How did you do that?

Delete songs from iTunes & disk

When I remove a song from iTunes, it doesn't ask me whether I want to remove it from the disk or leave the file where it is.
- I have the "Keep iTunes Media folder organized" check box checked
- I have the "Copy files to iTunes Media folder when adding to library" check box checked
- I've also tried to go to Preferences > Advanced > Reset warnings
Anyone know how I can get iTunes to ask me to remove the file from the disk as well? I've been having to search through my folders manually to delete files.
Thanks!

You could use this script: http://zach.in.tu-clausthal.de/tmp/Trash%20Current%20Track.scpt.zip
It moves the currently playing track to the trash.
(Just move it to <your home>/Library/Scripts/iTunes or <your home>/Library/iTunes/Scripts , I forget which one is better.)
Hope this helps.
Gabriel.
Message was edited by: GabrielZ

Can Windows Server Backup spread a single backup job across multiple disks if they are not set up as a virtual disk?

This may be a dumb question, but I can't seem to find any definitive information after having done many, many searches. Short question is - can Windows Server Backup spread a single backup job across multiple disks if they are not in a storage
pool or some other RAID/JBOD structure?
Background:
I'm running Server 2012 Essentials with all Windows Updates installed. I have been backing up approx 2.8TB of data (Bare Metal Recovery, C:, S: (shared folders), and system reserved) for the past year+ onto a storage pool made up of two-2TB external
USB drives. Backup is slow (takes approx 1.5 days to complete), but generally works. Not surprisingly I was constantly getting capacity low messages so I decided to increase my backup storage pool by adding a 3TB drive and another spare 750GB drive
for a total of 7.75TB. Instead of having four separate external USB enclosures, I bot a 4-bay enclosure - Startech.com model #S3540BU33E to simplify this (or so I thought!).
The first problem I had was adding the two new drives to the existing storage pool. I think that is because the Startech uses a JMicron USB controller that reports identical uniqueid's for all drives so only one shows up in the GUI interface for creating storage
pools. After doing research on this, I set up a new storage pool and virtual disk using all four drives via Powershell and thought I was good. However, when the backup ran, it failed after filling the first drive, saying there was no remaining capacity. In
reality there were three remaining empty drives and there storage pool reported almost 5TB of avail capacity. I assumed this was due to the identical uniqueid issue so I decided to try a different tactic.
Instead of using a storage pool that combines all four disks into one virtual disk, I just added each of them to Windows Server Backup as individual drives thinking it would manage them collectively. I.e., when a drive filled up during a particular backup,
it would just start using the next drive and so on. Apparently this was a foolish assumption because the backup failed again as soon as the first disk filled up.
So now I don't know if this is still an issue with the identical uniqueid's or if Server Backup actually can't spread a single backup across multiple individual drives that aren't in a pool or other virtual disk implementation. Hence, my original question.
My guess is that it does *not* spread them across individual disks, but I just wanted to get confirmation.
Thanks

Mandy,
Thank you for following up on my question.
Unfortunately the article you referenced doesn't address what I am trying to accomplish.
The article focuses on saving the same backup job to multiple disks and rotating the disks between on and offsite for enhanced protection. However, it still requires that an individual backup job fits on a single disk.
What I am trying to determine is if a single backup job can span across more than one physical disk (during the backup process) without those physical disks being in some type of virtual disk implementation (e.g., storage pool, RAID, etc.).
Thanks,
Gerry

Replicating storage locations from SAP SRM

Dear Experts,
How to replicate the storage locations from ECC to SAP SRM? How you can restrict the selection of storage location in SAP SRM based on the plant selection? i.e. plant 1000 has three storage locations say 1001, 1002, 1003. Now, when the user selects the plant 1000 as delivery address in direct procurement scenario, then the system should allow only the three values in value help?
Thanks and regards,
Ranjan

HI Ranjan,
Did you try by removing 'Storage Locations" from Extended Attributes in PPOMA_BBP?
thanks,
Rahul Mandale

Home Sharing removing files copied from another machine

I have two machines both backuped with Time Machine... I purchase movies, music and TV shows on machine A with HS configured (in family area). I have machine B (in office) configured to use HS and to copy new files from Machine A to Machine B. Both machines have HS configured with the same account. This seems to work fine, except... If I then delete media files from Machine A via iTunes that asks, and I confirm, to remove the files from the disk. Will the files also be deleted from Machine B automatically. This is the behaviour I think I'm seeing and it is unexpected. I would expect the files on Machine B to remain until specifically removed!
There are several weeks between the time I purchase media and my purging. I also verify the files have been copied to Machine B before purging from Machine A. Machine A has a smaller HDD so I periodically remove files from this machine to free up space. Then after some time I notice that the files purged from Machine A are no longer on Machine B.
Is this really the way HS is designed to work????
Thanks for any help.

Simon, There are 5 ways to share music with iTunes: (1) iTunes Music Sharing (a/k/a "regular" sharing), (2) Home Sharing, (3) Family Sharing, (4) multiple libraries using a shared set of files, and (5) each member have a copy of the content.
If you don't want them logging in with your Apple ID, Home Sharing is out. If you are only talking about non-DRM music, #5 may be the best solution.

Storage Spaces: Virtual Disk taken offline during file copy, marked as "This disk is offline because it is out of capacity", but plenty of free space

Server 2012 RC. I'm using Storage Spaces, with two virtual disks across 23 underlying physical disks.
* First virtual disk is fixed provisioning, parity across 23 physical disks: 10,024GB capacity
* Second virtual disk is fixed provisioning, parity across the remaining space on 6 of the same physical disks: 652GB capacity
These have been configured as dynamic disks, with an NTFS volume spanned across the two (larger virtual disk first). Total volume size 10,676GB. For more details of the hardware, and why the configuration is like this, see: http://social.technet.microsoft.com/Forums/en-US/winserver8gen/thread/c35ff156-01a8-456a-9190-04c7bcfc048e
I'm copying several TB from a network share to this volume. It is very slow at ~12MB/sec, but works. However, three times so far, several hours in to the file copy and with plenty of free space remaining, the 10,024GB virtual disk is suddenly taken offline.
This obviously then fails the spanned volume and stops the file copy.
The second time, I took screenshots, below. The disk (Disk27) is marked offline due to "This disk is offline because it is out of capacity". And the disk in the spanned volume is marked as missing (which is what you would expect when one of its member disks
is offline).
I can then mark the disk (Disk27) back online again, and this restores the spanned volume. I can then re-start the file copy from where it failed. There doesn't appear to be any data loss, but it does cause an outage that requires manual attention. As you
can see, there is plenty of space left on the spanned volume.
Each time this has happened, there are a few event 150 errors in the System event log: "Disk 27 has reached a logical block provisioning permanent resource exhaustion condition.". Source: Disk.
- <Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
- <System>
<Provider Name="disk" />
<EventID Qualifiers="49156">150</EventID>
<Level>2</Level>
<Task>0</Task>
<Keywords>0x80000000000000</Keywords>
<TimeCreated SystemTime="2012-06-07T11:24:53.572101500Z" />
<EventRecordID>14476</EventRecordID>
<Channel>System</Channel>
<Computer>Trounce-Server2.trounce.corp</Computer>
<Security />
</System>
- <EventData>
<Data>\Device\Harddisk27\DR27</Data>
<Data>27</Data>
<Binary>000000000200300000000000960004C0000000000000000000000000000000000000000000000000</Binary>
</EventData>
</Event>
This error seems to be related to thin provisioning of disks. I found this:
http://msdn.microsoft.com/en-us/library/windows/desktop/hh848068(v=vs.85).aspx. But both these Virtual Disks are configured as Fixed, not Thin provisioning, so it shouldn't apply.
My thoughts: the virtual disk should not spuriously go offline during a file copy, even if it was out of space. And in any case, there is plenty of free space remaining. Also, I don't understand the reason for why it is marked as offline ("This disk is offline
because it is out of capacity"). Why would a disk go offline because it was out of thin capacity, rather than just returning an "out of disk space" error while keeping it online.

Interesting Thread, I've been having the same issue. I had a failed hardware RAID that was impossible to recover in place, so after being forced to do a 1:1 backup, I find myself with 5 2TB hard drives to play with. Storage Spaces seemed like an interesting
way to go until I started facing the issues we share.
So my configuration is A VM Running Windows Server 2012 RC with 5 Virtualized Physical drives using a SCSI interface, 2TB in size that make up my storage pool. A Single Thinly provisioned Disk of 18 TB (using 1 disk for parity)
Interestly enough, write speed has not been an issue on this machine (30~70MB/s, up from 256k on the beta)
Of note to me is this error in my event log 13 minutes before the drive disappeared:
"The shadow copies of volume E: were deleted because the shadow copy storage could not grow in time.Consider reducing the IO load on the system or choose a shadow copy storage volume that is not being shadow copied."Source: volsnap, Event ID: 25, Level: Error
followed by:
"The system failed to flush data to the transaction log. Corruption may occur in VolumeId: E:, DeviceName: \Device\HarddiskVolume17.(The physical resources of this disk have been exhausted.)"Source: Ntfs (Microsoft-Windows-Ntfs), Event ID: 140, Level: Warning
I figure the amount of space available to me before I start encountering physical limits is in the vicinity of about 7TB. It dropped out for the second time at 184 GB.
FYI, the number of columns created for me is 5
Regards,
Steven Blom

How to move a virtual disk's physical allocation within a Storage Pool

I have a pool of 3x500GB where one the physical drives is having intermittent issues. Currently, there is only one parity Virtual Disk of 300GB Fixed across 3 columns. I want to replace the bad drive with a good one. The old way (pre-2012) was replace the
disk, repair the RAID 5, resync and done. These basic steps are not working.
So far I have added a 4th 500GB drive to the pool. After searching and failing to find a way to move the data non-destructively, I decided to just pull the data cable on the disk I wanted to replace. After refresh/rescan, the disconnected drive shows "lost
communication" and the virtual disk (after trying to repair) shows "unknown" (but the volume on that disk is accessible in Explorer). When I try to remove the physical disk in Server Manager, I get "The selected physical disk cannot
be removed". Reading the error message, I see that the replacement disk cannot contain any part of a virtual disk. The replacement disk that I just added appears to have some space allocated (possibly because I have tried this same procedure a couple
of times already?). When I look at the parity disk properties/health, it shows all four physical disks under "physical disks in use".
I have deleted and recreated a lot of storage pools lately while trying to understand how they work but I would like to avoid that this time. The data on the virtual disk in question is highly deduplicated and it took quite a while to get it that way. Since
I can't find a way to copy/mirror the disk while keeping it fully deduplicated, I would need 3x the space to copy it all off, or a lot of time to load up and deduplicate a new virtual disk.
I have several questions:
1. How can a 3 column parity disk use parts of four physical disks? And can that be fixed without recreating the virtual disk?
2. When creating a virtual disk (for example a 3 column disk in a pool that has four or more physical drives), is there a way to specify which physical disks to use?
3. I understand that after a physical disk failure, the recovery process will move a virtual disk's allocation to a replacement disk, but can a virtual disk's allocation be moved manually among physical disks within the same storage pool
using a PS script?
4. Can a deduplicated virtual disk be moved/mirrored/backed up without expanding the data?
Any help is appreciated.

Im still fighting with storage pools and need more tests to be done and have a lot of questions my self but ther goes what I understood so far.
You may define physical disks used for virtual disk by Powershell ,
for list of all commands follow this:
http://technet.microsoft.com/en-us/library/hh848705(v=wps.620).aspx ,
specific command defining physical disks to be used on already existing virtual disk:
Example 4: Manually assigning physical disks to a virtual disk
This example gets two physical disks that have already been added to the storage pool and designated as ManualSelect disks,
PhysicalDisk3 and PhysicalDisk4, and assigns them to the virtual disk
UserData.
PS C:\> Add-PhysicalDisk –VirtualDiskFriendlyName UserData –PhysicalDisks (Get-PhysicalDisk -FriendlyName PhysicalDisk3, PhysicalDisk4)
http://technet.microsoft.com/en-us/library/hh848702(v=wps.620).aspx
If You haven't seen this yet You may check it out http://blogs.technet.com/b/yungchou/archive/2011/12/06/free-ebooks.aspx

The storage where the virtual hard disk is located does not support virtual disk sharing

Hi everyone,
I deployed 2 hyper v vitual machines a while ago, and i did that because I needed to test my current game Project, which is an
online game. However, i've had some problems with my Windows installation then I had to reset the pc by making it a refresh
install. I still have the hyper v virtual disks, but i cannot attach it to a new hyper-v virtual machine. it pops up this message:
"the storage
where the virtual hard disk is located does not support virtual disk sharing". I dont know anything about virtual machines, so I
didnt know I had to make the disk sharable. How can I force to attach the hard disk to a new hyper-v? I dont want to go t
hrough the whole proccess of installing the operating system all over again and updating it....
Any help is greatly appreciated!
Thanks in advance,
Romulo Romero

Hi MrDebugging,
>>
When I Try to add a SCSI Controller, and then I click browse to add a UNC I get this:
C:\Users\Public\Documents\Hyper-V\Virtual hard disks\ClienMachine.vhdx
but I tried placing in different location, and the same problem occurs!
By the way, Im not on a server , I am a domestic user and I am running it on my
Windows 8.1
According to the error message , it seems that it is not a permission issue .
The VM is Gen 1 or Gen2 ?
Generally the error message occurs when you enable "shared vhdx" on standalone/client hyper-v host :
Please try to attach the VHDx file to IDE controller if it is a Gen 1 virtual machine (because only the SCSI controller has the option "virtual hard disk sharing" and Gen 1 VM only can boot from IDE )
All in all , please do not use this feature without CSV or Scale-Out File Server with SMB 3.0 on file-based storage .
If it is not the case , please detail steps what you did .
Best Regards,
Elton Ji
Please remember to mark the replies as answers if they help and unmark them if they provide no help. If you have feedback for TechNet Subscriber Support, contact [email protected] .

Unable to repair degraded Virtual disks in Storage Spaces 2012R2

Hi all,
I have an anoying problem that I cannot seems to find a solution for.
I have a 2 node Failover Cluster with CSV-volumes consisting of 2 HP DL360 servers with 2 LSI 9300-16e HBAs each, connected to 3 Supermicro JBOD-cases with a total of 84 disks. With Storage spaces I have made 1 Pool with 6 virtual disks and 3 of these disks
are Degraded. However, when I look at the physical disks they are all fine and healthy, if I try to repair the disks it finishes without any error messages but the disk is still Degraded.
OS = Windows Server 2012R2
Anyone have an idea?
Thanks!

Hello Partner,
Thanks so much for contacting Microsoft. This is Sophia who will help you with this issue.
From your description, I learnt that the issue you are experiencing is that you failed to repair degraded Virtual disks in Storage Spaces 2012 R2. Please let me
know if I misunderstand anything.
First of all, I would like to suggest you install the following hotfix to upgrade storage related files to the newest edition. After that, please test how the issue
goes.
==========================================
Package: This is to upgrade NTFS.sys.
KB Article Number(s): 2996802
Language: All (Global)
Platform: x64
Location: (http://hotfixv4.microsoft.com/Windows%208.1/Windows%20Server%202012%20R2/sp1/Fix524134/9600/free/480025_intl_x64_zip.exe)
Package: This is to upgrade Msiscsi.sys
KB Article Number(s): 3000123
Language: All (Global)
Platform: x64
Location: (http://hotfixv4.microsoft.com/Windows%208.1/Windows%20Server%202012%20R2/sp1/Fix524132/9600/free/479758_intl_x64_zip.exe)
Package: This is to upgrade MSDSM.sys & MPIO.SYS
KB Article Number(s): 2914743
Language: All (Global)
Platform: x64
Location: (http://hotfixv4.microsoft.com/Windows%208.1/Windows%20Server%202012%20R2/sp1/Fix525821/9600/free/479581_intl_x64_zip.exe)
Best regards,
Sophia Sun
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HT201364 how do I remove items from startup disk to load OS X Mavericks?

I'm trying to load OS X Mavericks and I'm getting a message to remove items from startup disk. Can anyone tell me how to do that??

For information about the Other category in the Storage display, see this support article. If the Storage display seems to be inaccurate, try rebuilding the Spotlight index.
Empty the Trash if you haven't already done so. If you use iPhoto, empty its internal Trash first:
iPhoto ▹ Empty Trash
Do the same in other applications, such as Aperture, that have an internal Trash feature. Then reboot. That will temporarily free up some space.
According to Apple documentation, you need at least 9 GB of available space on the startup volume (as shown in the Finder Info window) for normal operation. You also need enough space left over to allow for growth of the data. There is little or no performance advantage to having more available space than the minimum Apple recommends. Available storage space that you'll never use is wasted space.
When Time Machine backs up a portable Mac, some of the free space will be used to make local snapshots, which are backup copies of recently deleted files. The space occupied by local snapshots is reported as available by the Finder, and should be considered as such. In the Storage display of System Information, local snapshots are shown as Backups. The snapshots are automatically deleted when they expire or when free space falls below a certain level. You ordinarily don't need to, and should not, delete local snapshots yourself. If you followed bad advice to disable local snapshots by running a shell command, you may have ended up with a lot of data in the Other category. Reboot and it should go away.
See this support article for some simple ways to free up storage space.
You can more effectively use a tool such as OmniDiskSweeper (ODS) or GrandPerspective (GP) to explore the volume and find out what's taking up the space. You can also delete files with it, but don't do that unless you're sure that you know what you're deleting and that all data is safely backed up. That means you have multiple backups, not just one. Note that ODS only works with OS X 10.8 or later. If you're running an older OS version, use GP.
Deleting files inside an iPhoto or Aperture library will corrupt the library. Any changes to a photo library must be made from within the application that created it. The same goes for Mail files.
Proceed further only if the problem isn't solved by the above steps.
ODS or GP can't see the whole filesystem when you run it just by double-clicking; it only sees files that you have permission to read. To see everything, you have to run it as root.
Back up all data now.
If you have more than one user account, make sure you're logged in as an administrator. The administrator account is the one that was created automatically when you first set up the computer.
Install the app you downloaded in the Applications folder as usual. Quit it if it's running.
Triple-click anywhere in the corresponding line of text below on this page to select it, then copy the selected text to the Clipboard by pressing the key combination command-C:
sudo /Applications/OmniDiskSweeper.app/Contents/MacOS/OmniDiskSweeper
sudo /Applications/GrandPerspective.app/Contents/MacOS/GrandPerspective
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V). You'll be prompted for your login password, which won't be displayed when you type it. You may get a one-time warning to be careful. If you see a message that your username "is not in the sudoers file," then you're not logged in as an administrator.
The application window will open, eventually showing all files in all folders, sorted by size. It may take a few minutes for the app to finish scanning.
I don't recommend that you make a habit of doing this. Don't delete anything as root. If something needs to be deleted, make sure you know what it is and how it got there, and then delete it by other, safer, means. When in doubt, leave it alone or ask for guidance.
When you're done with the app, quit it and also quit Terminal.

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