[ILUG] Hardware and Software raid

[Sean]

Chris Higgins wrote something:
{ On Wed, 10 Jul 2002 17:20:00 +0100
{ "John P. Looney" <valen at tuatha.org> wrote:
{ 
{ > On Wed, Jul 10, 2002 at 02:45:51PM +0100, Matthew French mentioned:
{ > > I presume that I need to run controller specific software to create
{ > > a hardware raid device. So if I ran mkraid, this would make it a
{ > > software raid device? This is on a Sun Ultra 3000, and I did not
{ > > check the available hardware before wiping off Solaris.
{ > 
{ >  Sun never do hardware raid. Their opinion is that your Ultra CPU's
{ 
{ I suppose that means that the 
{  "Sun[tm] Hardware RAID Storage Systems Administration (ES-255)"
{  http://suned.sun.com/US/catalog/courses/ES-255.html - July 1, 2002 - 29 KB
{ 
{ course is spent hitting students over the head and getting them to
{ repeat 'software raid is better'

  Hmm....  That course includes the T3 array...

  Sun's T3 array:
    9 disk array ( 9 x either (36 | 72 GB) ) per enclosure,
    2 enclosures per unit => max of 18 x 72 GB = 1296 GB.

    Hardware raid with raid level 0, 0+1 or 5

     -- up to 1 GB memory cache in each enclosure
     -- linux drivers available

   t3 page:
     http://www.sun.com/storage/t3es/index.html
   linux multipath howto with t3's:
     http://www.sun.com/storage/white-papers/red_hat_sunstoredge_overview.pdf
   linux drivers:
     http://open-projects.linuxcare.com/t3/

{ 
{ >  are likely faster than any raid card, and better at doing RAID
{ >  anyway. And any good Sun engineer will beat your with your SS3000's
{ >  backplane if he catches you doing CPU intensive RAID like RAID 4/5.
{ > 
{ >  Stick with RAID 1+0. Your only man, when you have lots of cash.
{ > 
{ > Kate
{ > 
{ > 
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{ 
{ 
{ -- 
{ 
{ Chris Higgins
{ Horizon Technical Services
{ e: chris.higgins at hts.horizon.ie
{ tel: +353-1-6204900
{ fax: +353-1-6204901
{ 
{ -- 
{ Irish Linux Users' Group: ilug at linux.ie
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{ List maintainer: listmaster at linux.ie

Sean.
.