1.1.1.1 Striping (RAID 0) Striping refers to the storing of data across multiple drives in a drive group. If there are three drives in a drive group then the subsequent data will be stored across all three drives. This creates a very high performance virtual disk with the capacity equal to the combined capacity of the installed disks. RAID Level 0 provides high availability and very high performances for both read and write operations. However, no redundant parity is generated for protection against disk failure.
1.1.1.2 Mirroring (RAID 1) Mirroring refers to the replication of data on two or more drives. Each drive contains a mirror image of the data on the primary drive. Virtual disk space equals to capacity of the smallest installed disk drive. Mirroring causes operational overhead resulting in lower performance for write operations, however it does provide the highest data reliability among RAID Levels 0 to 5 with very high per for mance for read intensive operations. 1.1.1.4 Striping with Interspersed Parity (RAID 5) Striping with Parity is a method of storing data striped across multiple drives like RAID 0 but with parity (redundant data calculated by XOR logic used to reproduce data in case of lost data) also striped across the drives. RAID Level 5, which offers a very high data redundancy, availability and performance. -- Slower on writes -- 1.1.1.5 Stripping with Mirroring (RAID 0+1) This RAID level is a combination of RAID 0 (Striping) and RAID 1 ( mirroring), it contains both features of these arrays-security and sequential performance. Sometimes it is referred to as RAID 10. Hope this helps? Kevin Bilbee > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Admin-ML > Sent: Tuesday, August 31, 2004 10:43 AM > To: [EMAIL PROTECTED] > Subject: AW: AW: Re[2]: [IMail Forum] Server Type for IMail > > > Yes, "reading", but the talk was about "writing". > > > >-----Urspr�ngliche Nachricht----- > >Von: [EMAIL PROTECTED] > >[mailto:[EMAIL PROTECTED] Im Auftrag von Pete McNeil > >Gesendet: Dienstag, 31. August 2004 18:59 > >An: Admin-ML > >Betreff: Re: AW: Re[2]: [IMail Forum] Server Type for IMail > > > >On Tuesday, August 31, 2004, 11:55:38 AM, Admin-ML wrote: > > > >AM> Uh, as far as I know, RAID 5 is faster than RAID 1, since it > >AM> can distribute the write packets on multiple hard disks at once, > >AM> while RAID 1 (with Hardware RAID) is just as fast as writing to a > >AM> single non-RAID-disk. Isn't that correct? > > > >Mostly, though a good RAID1 implementation can also divide reads among > >the two disks also. > > > >_M > > > > > > > > > >To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > >List Archive: > >http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > >Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > > > > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html > List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ > Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/ > To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
