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<DIV><SPAN class=763582211-25072005><FONT face=Arial color=#0000ff size=2>I'm
sure many will answer the questions, so for a different perspective: Make sure
you buy a drives from a number of manufacturers, or get ones from different
production batches - I was once on a customer's site where two 'brand-x' drives
in a RAID 5 array went bad within minutes of each other due to a spindle bearing
defect and this took down the array.</FONT></SPAN></DIV>
<DIV><SPAN class=763582211-25072005><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><FONT face=Tahoma size=2>-----Original Message-----<BR><B>From:</B>
centos-bounces@centos.org [mailto:centos-bounces@centos.org] <B>On Behalf Of
</B>Andrew Vong<BR><B>Sent:</B> 25 July 2005 10:57<BR><B>To:</B>
centos@centos.org<BR><B>Subject:</B> [CentOS] RAID 5 vs. RAID
10<BR><BR></FONT></DIV>
<BLOCKQUOTE style="MARGIN-RIGHT: 0px"><FONT face=Arial color=#0000ff
size=2></FONT><BR>Hi,<BR><BR>I am looking into purchasing a new server. This
server will be mission-critical. <BR><BR>I have read and somewhat understood
the theories behind RAIDs 0, 1, 5, 10 & JBOD. However, I would like to get
some feedback from those who have experience in implementing and recovering
from a HDD failure using RAID. <BR><BR>Hardware specs include:-<BR><BR>Dual
Xeon 3.2 GHz<BR>2 GB RAM<BR><BR>I would like to implement hardware RAID but am
unsure as to which would be most suitable for my needs. Any advice is
appreciated. <BR><BR><B>Option 1</B> - RAID 5 (3 hdd's) + 1 hot
spare<BR><BR><B>Option 2</B> - RAID 10 (4 hdd's) + 1 "cold" spare (in the
shelf)<BR><BR><BR><B>Questions I have :-<BR><BR></B>1) When should RAID 5 be
implemented? <BR>2) When should RAID 10 be implemented?<BR>3) Is RAID 5 with a
hot spare safer than RAID 10 with a "cold" spare?<BR>4) Is it possible to
configure RAID 10 to have a hot spare? <BR>5) Should one of the HDDs fail, a
hot spare w kick-in immediately and begin rebuilding. As I am planning to put
in 300 GB HDDs, how long would this take on a RAID 5 vs. RAID 10? <BR>6) Will
there be a degradation in performance for users on the system (RAID 5 vs. RAID
10)? <BR>7) What are the disadvantages of using RAID 5 vs. RAID 10?
<BR><BR>Thanks in advance for answering my questions.<BR><BR>Best
Regards,<BR>Andrew<BR><BR></BLOCKQUOTE></BODY></HTML>