May 18, 2009 RAID 5/6/50/60, is another story. Hardware can offer solutions (NVRAM & Battery backup) to the write hole issue, assuming it's even available via software RAID (perhaps 5, but I've never seen 6/50/60). Software can't. Some models also offer backup copies of the Partition Tables, which is absolutely come in handy a time or two for recovery.
For Macs with multiple hard drives running OS X Lion Server, Disk Utility can set up multiple drives to work together as a software RAID to increase performance, protect data, or both.
Software RAID takes some of the computer’s processing power, and it isn’t as secure as a hardware RAID controller system. For example, a system crash could affect a software RAID but would not affect a hardware RAID. However, a software RAID is far less expensive and does provide the benefits of data redundancy. You can also use external FireWire drives in a RAID set.
Here’s how to create a software RAID:
Launch Disk Utility.
Click the RAID tab.
Drag and drop drives from the left pane into the RAID pane.
Use drives — not volumes — from the left pane. Partitions/volumes are listed under the drive name and are indented.
Type a name for the RAID set in the Name field.
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In the Format pop-up menu, make sure that Mac OS X Extended (Journaled) is selected.
From the RAID Type pop-up menu, choose Mirrored, Striped, or Concatenated:
Mirrored (or RAID 1) writes the same data to two drives simultaneously. If one drive fails, the other drive still contains all the data.
Striped(or RAID 0) makes multiple hard drives of the same size work together as a single, fast, large hard drive. Data from a file is fragmented and written on multiple drives. When accessing the file, the system reads the fragments from all the drives simultaneously. If one of the drives in a RAID 0 fails, all the data is lost.
Concatenated combines multiple hard drives into one without the speed benefits of striping, but you can combine drives of different sizes. Epson stylus sx525wd software mac. Concatenating gets really interesting when used with another RAID. For example, concatenate two FireWire drives that add up to the capacity of the internal drive and then mirror the internal drive with the concatenated FireWire drives.
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You can also use it to create a RAID 1+0. For example, if you have four drives, concatenate a 2-drive mirror array with a 2-drive striped array. This gives you the performance of striping with the redundancy of mirroring.
Click the Create button.
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Disk Utility User Guide
You can create a Redundant Array of Independent Disks (RAID) set to optimize storage performance and increase reliability in case of a disk failure. You can also create a set that concatenates smaller disks to act as one larger disk.
In the Disk Utility app on your Mac, choose File > RAID Assistant.
Select a set type:
Striped (RAID 0) set: A striped RAID set can speed up access to your data. You can’t create a RAID set on your startup disk; you must first start up your computer from another disk.
Mirrored (RAID 1) set: Protect your data against hardware failure with a mirrored RAID set. When you create a mirrored RAID set, your data is written to multiple disks so the information is stored redundantly. You can’t create a RAID set on your startup disk; you must first start up your computer from another disk.
Concatenated (JBOD) set: Increase storage space with a concatenated disk set. If you need one large disk, but you have several smaller disks, you can create a concatenated disk set to use as one large disk.
Select the checkboxes of the disks you want to include in the set.
For each disk, click the pop-up menu in the Role column and choose “RAID slice” or “Spare” to designate the disk as a standard member or spare in the set, then click Next.
https://tapilaco.tistory.com/10. Enter a name for the RAID set in the RAID Name field.
Click the Format pop-up menu, then choose a volume format that you want for all the disks in the set. (See File system formats available in Disk Utility.)
Click the “Chunk size” pop-up menu, then choose a disk chunk size that you want used for all the disks.
When you create a striped set, chunks of data from the same file are distributed across the drives. Top pcb design software. Ideally, you want data distributed across drives evenly and at an optimum size so that it can be efficiently accessed. If you want high data throughput from your set, choose a smaller chunk size so that data is spread across the drives and one drive can be accessing data while another is seeking the next chunk. With mirrored disk sets, choose a chunk size that matches the data you’re accessing. For example, when working with video files, your Mac is accessing large chunks of data, whereas when using a database of many small records, your disks may be accessing smaller chunks of information.
If you are creating a mirrored RAID set, select the “Automatically rebuild” checkbox to allow the set to be automatically rebuilt when member disks are reconnected.
Click Create.
Click Done.
Mac Os Software Raid 5 Performance Reviews
If you have a Mac Pro with a Mac Pro RAID card, use RAID Utility. It uses the RAID card for better performance and to create more types of RAID sets.
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