Linux Storage system: looking for advices Post: 302384141

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Special Forums Hardware Filesystems, Disks and Memory Linux Storage system: looking for advices Post 302384141 by pludi on Monday 4th of January 2010 06:35:11 AM

01-04-2010

Registered User

My approach would be to partition the disks in similar sized partitions, and create RAID1/RAID5 across them, and then use LVM to collect them as 1 device. Example with 4 disks:

Code:

+----------+
| 1TB      | Disk 1, 1 TB
+----------+
+----------+-----+
| 1TB      |.5TB | Disk 2, 1.5 TB
+----------+-----+
+----------+-----+
| 1TB      |.5TB | Disk 3, 1.5 TB
+----------+-----+
+----------+-----+-----+
| 1TB      |.5TB |.5TB | Disk 4, 2 TB
+----------+-----+-----+

The 4 partitions sized 1 TB would be made into 1 software RAID5 with a total usable size of about ~1.3 TB. The 500GB partitions would be assembled into a RAID5 with about 1 TB total usable space. With an LVM across both RAIDs you'd be looking at ~1.8TB total space that's protected from disk failure. The left-over 500 GB could be used for temporary space, added to the LVM as snapshot space, or to hold the OS.

pludi

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zipios_referencecount

zipios::ReferenceCount(3)				     Library Functions Manual					 zipios::ReferenceCount(3)

NAME

       zipios::ReferenceCount -

       ReferenceCount is useful to ensure proper handling of the reference count for (objects of) classes handled through a SimpleSmartPointer.

SYNOPSIS

       #include <simplesmartptr.h>

   Public Member Functions
       ReferenceCount ()
	   Constructor intializes count to zero.
       ReferenceCount (const ReferenceCount &src)
	   Copy-constructor intializes count to zero.
       const ReferenceCount & operator= (const ReferenceCount &src)
	   The assignment operator doesn't copy the reference count, it leaves it unchanged.

   Friends
       class SimpleSmartPointer< Type >
	   SimpleSmartPointer needs to be a friend to invoke the private ref() and unref() methods.
       class SimpleSmartPointer< const Type >
       class FileEntry
	   Type also needs to be a friend to invoke the private ref() and unref() methods, in case Type doesn't want to inherit ReferenceCount and
	   thus needs to invoke ref() and unref() through forwarding member functions.
       class Bogus

Detailed Description
   template<class Type>class zipios::ReferenceCount< Type >
       ReferenceCount is useful to ensure proper handling of the reference count for (objects of) classes handled through a SimpleSmartPointer.

       Subclassing ReferenceCount is all a class needs to become ready for being handled by SimpleSmartPointer. Another way is to add a
       ReferenceCount member variable to a class and write two methods 'void ref() const' and 'unsigned int unref() const' that invoke the same
       methods in the ReferenceCount variable.

       Definition at line 99 of file simplesmartptr.h.

Constructor &; Destructor Documentation
   template<class Type> zipios::ReferenceCount< Type >::ReferenceCount () [inline]
       Constructor intializes count to zero.

       Definition at line 122 of file simplesmartptr.h.

   template<class Type> zipios::ReferenceCount< Type >::ReferenceCount (const ReferenceCount< Type > &src) [inline]
       Copy-constructor intializes count to zero. It doesn't copy it from src.

       Definition at line 126 of file simplesmartptr.h.

Member Function Documentation
   template<class Type> const ReferenceCount& zipios::ReferenceCount< Type >::operator= (const ReferenceCount< Type > &src) [inline]
       The assignment operator doesn't copy the reference count, it leaves it unchanged.

       Definition at line 130 of file simplesmartptr.h.

Friends And Related Function Documentation
   template<class Type> friend class FileEntry [friend]
       Type also needs to be a friend to invoke the private ref() and unref() methods, in case Type doesn't want to inherit ReferenceCount and
       thus needs to invoke ref() and unref() through forwarding member functions.

       Definition at line 117 of file simplesmartptr.h.

   template<class Type> friend class SimpleSmartPointer< Type > [friend]
       SimpleSmartPointer needs to be a friend to invoke the private ref() and unref() methods.

       Definition at line 102 of file simplesmartptr.h.

Author
       Generated automatically by Doxygen for Zipios++ from the source code.

Zipios++							  Mon Oct 10 2011					 zipios::ReferenceCount(3)