Re: hard- or software-raid?

[Tinus Nijmeijers <tinus@deephosting.com>]

On Fri, 2003-01-24 at 09:22, Adrian 'Dagurashibanipal' von Bidder wrote:
> On Fre, 2003-01-24 at 00:16, Tinus Nijmeijers wrote:
> > I'm building a server that needs about 200G of harddisk space and the
> > data has to be safe. If I need to replace a faulty hd and get downtime
> > that's fine. Speed is not an issue.
> 
> Agree with Russel and thing: what's raid6?
> 


my other system:

***** DAC960 RAID Driver Version 2.2.10 of 1 February 2001 *****
Copyright 1998-2001 by Leonard N. Zubkoff <lnz@dandelion.com>
Configuring Mylex AcceleRAID 170 PCI RAID Controller
  Firmware Version: 6.00-01, Channels: 1, Memory Size: 32MB
  PCI Bus: 0, Device: 11, Function: 1, I/O Address: Unassigned
  PCI Address: 0xFB000000 mapped at 0xFC800000, IRQ Channel: 17
  Controller Queue Depth: 512, Maximum Blocks per Command: 2048
  Driver Queue Depth: 511, Scatter/Gather Limit: 128 of 257 Segments
  Physical Devices:
    0:2  Vendor: FUJITSU   Model: MAN3184MC         Revision: 0107
         Wide Synchronous at 160 MB/sec
         Serial Number: UFL0P15005AC
         Disk Status: Standby, 35852288 blocks
    0:3  Vendor: FUJITSU   Model: MAN3184MC         Revision: 0107
         Wide Synchronous at 160 MB/sec
         Serial Number: UFL0P150058H
         Disk Status: Online, 35852288 blocks
    0:4  Vendor: FUJITSU   Model: MAN3184MC         Revision: 0107
         Wide Synchronous at 160 MB/sec
         Serial Number: UFL0P15005TV
         Disk Status: Online, 35852288 blocks
    0:5  Vendor: FUJITSU   Model: MAN3184MC         Revision: 0107
         Wide Synchronous at 160 MB/sec
         Serial Number: UFL0P15005SS
         Disk Status: Online, 35852288 blocks
    0:6  Vendor: FUJITSU   Model: MAN3184MC         Revision: 0107
         Wide Synchronous at 160 MB/sec
         Serial Number: UFL0P15006BD
         Disk Status: Online, 35852288 blocks
    0:7  Vendor: MYLEX     Model: AcceleRAID 170    Revision: 0600
         Wide Synchronous at 160 MB/sec
         Serial Number:   
  Logical Drives:
    /dev/rd/c0d0: RAID-6, Online, 71704576 blocks
                  Logical Device Initialized, BIOS Geometry: 255/63
                  Stripe Size: 64KB, Segment Size: 8KB
                  Read Cache Disabled, Write Cache Disabled
  No Rebuild or Consistency Check in Progress


RAID 6
RAID 6 is similar to RAID 5, but uses two parity schemes simultaneously.
This gives it the advantage of very high fault tolerance, but at the
cost of write performance (as there is a lot of parity information that
needs to be computed and written), and a relatively high overhead.


tinus