RAID 0+1 | Promise Technology TX4, TX8 specification

Recommended Applications for RAID 1

•Accounting

•Payroll

•Financial

•Any application requiring very high availability

RAID 3

Advantages	Disadvantages
High Read data transfer rate	Parity drive can become bottleneck if a lot
Disk failure has an insignificant impact on	of writes are occurring
Disk failure has an insignificant impact on
throughput

Recommended Applications for RAID 3

•Image Editing

•Prepress Applications

•Any application requiring high throughput

RAID 5

Characteristics/Advantages	Disadvantages
High Read data transaction rate	Disk failure has a medium impact on
Medium Write data transaction rate	throughput
Medium Write data transaction rate
Good aggregate transfer rate

Recommended Applications for RAID 5

•File and Application servers

•WWW, E-mail, and News servers

•Intranet servers

•Most versatile RAID level

RAID 0+1

Characteristics/Advantages	Disadvantages
Implemented as a mirrored array whose	High disk overhead - uses only 50% of
segments are RAID 0 arrays	total capacity
High I/O rates are achieved thanks to
multiple stripe segments

Recommended Applications for RAID 0+1

•Imaging applications

•Database servers

•General fileserver

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Promise Technology TX4, TX8 user manual RAID 0+1, Characteristics/Advantages Disadvantages

Contents

ULTRATRAK100 TX4 ULTRATRAK100 TX8 Important Data Protection Information CopyrightTrademarks Radio Frequency Interference Statement Table of Contents RAID Page Architectural Description Introduction Feature Benefit Features and Benefits Configuration Install Hard DrivesGetting Started Unpack ULTRATRAK100 UltraTrak100 Disk Drive Access TX4 Shown Back of UltraTrak100 TX4 see for TX8 Connecting the Scsi Cables Daisy Chaining Several UltraTrak100s Together Assign a Scsi ID Connect Power Cable and Switch Power on Configure the ULTRATRAK100 Press SEL to Save Changes Advantages Disadvantages Choosing a RAID Level RAID 0+1 Characteristics/Advantages Disadvantages Jbod Partition and Format the Array Drive Status Indicators MaintenanceIndicator Color Meaning Critical & Offline Arrays Replacing a Disk Drive Module REBUILDING/SYNCHRONIZING Fault Tolerant ArraysWhen a Disk Drive Fails Drive Carrier Drive Replacement Replacing a Power Supply Module TX8 only Connecting Cables to Disk Drive Back of UltraTrak100 TX8 Type of Interface Name Comments ULTRATRAK100 Front Panel Interface Configuration Mode Error ModeLCD Messages Array Functional View Status View Status Configure Array Configure CacheConfigure Scsi View Cache Stats View Controller InfoView Array Information View Enclosure View Controller Information Array 0 Size 12GB Temperature 30C/86FRAID 0 Functional 5009 RPM Create/Cancel Press SEL to Create Press Exit to Cancel What you can do Auto Array SetupView Drive Assignments Define Array Delete Array Maxtor Asng In Ary IBM Asng In Ary No Free Disk What you can do RAID Level 4KB 8KB IBM Assigned Maxtor Free Maxtor Free Wipe out disk Synchronize Array Disable Buzzer Rebuild/Sync Pri. Low Array ID Write Cache What you can do Write CacheWrite Back Write Thru What you can do Write Back ID Selected Mode Press Or to move these items on the LCD What you can do Scsi ID Contacting Promise Support Technical Support ServicesUSA Tech Support Center European Tech Support China Office Pacific Rim Sales Office Disclaimer of Other Warranties Limited WarrantyPage Returning Product for Repair USA & Canada Your Responsibilities Introduction to RAID Appendix a Technology Background RAID 1 Mirroring RAID 0+1 STRIPING/MIRROR RAID 3 Block Striping with Parity Drive RAID 5 Block and Parity Striping Jbod Spanning Appendix B Frequently Asked Questions Why can’t I see the drives on the UltraTrak100 under FDISK?