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IDS Forum

Re: using raid 5 with a san

Posted By: kannan.thirugnanam@JTax.com
Date:

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If you have multiple trays with 1GB of cache in the controllers and hav=
e
multiple LUNs defined, you could achieve very good performance.
Space would be an advantage in RAID5 when compared to RAID1 or RAID1+0.=


I am not sure about what SAN system you have/getting, but in some SANs =
you
could loose (one disk / tray + 1).
Say if you have 6 trays in one array, you could loose 7 disks and still=
be
running (with some degraded performance).
Configuring multiple LUNs and separating the TblSpaces(DBspaces) depend=
ing
on the usage, you could significantly enhance the I/Os.

There is no one thumb rule to configure for all the environments. It th=
e
job of the DBA and System Admin to sit together and figure it out.

Good Luck,
Kannan Thirugnanam





=

"Malcolm Per...." =

<malc_p@btinterne =

t.com>@SMTP@Excha =
To
nge ids@iiug.org@SMTP@Exchange =

=
cc
02/17/2005 12:13 =

PM Subj=
ect
Re: using raid 5 with a san =

[4287] =

=

=

=

=

=

=




--- liewkn@mydbsolve.com wrote:
> Use RAID 1+0 with multi slice/volumn according to
> planned size of
> table(historical/transaction/static).
>

Why? In what way is this preferable to the setup the
original poster asked for comment on? (I'd like to
know as well because my UNIX admin forced a RAID5 SAN
upon us).

Malc
=

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<html><body>
<p>If you have multiple trays with 1GB of cache in the controllers and =
have multiple LUNs defined, you could achieve very good performance. <b=
r>
Space would be an advantage in RAID5 when compared to RAID1 or RAID1+0.=
<br>
<br>
I am not sure about what SAN system you have/getting, but in some SANs =
you could loose (one disk / tray + 1). <br>
Say if you have 6 trays in one array, you could loose 7 disks and still=
be running (with some degraded performance).<br>
Configuring multiple LUNs and separating the TblSpaces(DBspaces) depend=
ing on the usage, you could significantly enhance the I/Os.<br>
<br>
There is no one thumb rule to configure for all the environments. It th=
e job of the DBA and System Admin to sit together and figure it out.<br=
>
<br>
<tt><font size=3D"4">Good Luck,<br>
Kannan Thirugnanam<br>
<br>
<br>
</font></tt><br>
<img src=3D"cid:10__=3D0ABBE538DFF003648f9e8a93df93869@JTax.com" width=3D=
"16" height=3D"16" alt=3D"Inactive hide details for &quot;Malcolm Per..=
..&quot; &lt;malc_p@btinternet.com&gt;@SMTP@Exchange">&quot;Malcolm Per=
....&quot; &lt;malc_p@btinternet.com&gt;@SMTP@Exchange<br>
<br>
<br>

<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=

<tr valign=3D"top"><td style=3D"background-image:url(cid:20__=3D0ABBE53=
8DFF003648f9e8a93df93869@JTax.com); background-repeat: no-repeat; " wid=
th=3D"40%">
<ul>
<ul>
<ul>
<ul><b><font size=3D"2">&quot;Malcolm Per....&quot; &lt;malc_p@btintern=
et.com&gt;@SMTP@Exchange</font></b><font size=3D"2"> </font>
<p><font size=3D"2">02/17/2005 12:13 PM</font></ul>
</ul>
</ul>
</ul>
</td><td width=3D"60%">
<table width=3D"100%" border=3D"0" cellspacing=3D"0" cellpadding=3D"0">=

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D0ABBE538DFF003648f9e8a93df93869@JTax.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""><br>
<div align=3D"right"><font size=3D"2">To</font></div></td><td width=3D"=
100%"><img src=3D"cid:30__=3D0ABBE538DFF003648f9e8a93df93869@JTax.com" =
border=3D"0" height=3D"1" width=3D"1" alt=3D""><br>
<font size=3D"2">ids@iiug.org@SMTP@Exchange</font></td></tr>

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D0ABBE538DFF003648f9e8a93df93869@JTax.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""><br>
<div align=3D"right"><font size=3D"2">cc</font></div></td><td width=3D"=
100%"><img src=3D"cid:30__=3D0ABBE538DFF003648f9e8a93df93869@JTax.com" =
border=3D"0" height=3D"1" width=3D"1" alt=3D""><br>
</td></tr>

<tr valign=3D"top"><td width=3D"1%" valign=3D"middle"><img src=3D"cid:3=
0__=3D0ABBE538DFF003648f9e8a93df93869@JTax.com" border=3D"0" height=3D"=
1" width=3D"58" alt=3D""><br>
<div align=3D"right"><font size=3D"2">Subject</font></div></td><td widt=
h=3D"100%"><img src=3D"cid:30__=3D0ABBE538DFF003648f9e8a93df93869@JTax.=
com" border=3D"0" height=3D"1" width=3D"1" alt=3D""><br>
<font size=3D"2">Re: using raid 5 with a san [4287] </font></td></tr=
>
</table>

<table border=3D"0" cellspacing=3D"0" cellpadding=3D"0">
<tr valign=3D"top"><td width=3D"58"><img src=3D"cid:30__=3D0ABBE538DFF0=
03648f9e8a93df93869@JTax.com" border=3D"0" height=3D"1" width=3D"1" alt=
=3D""></td><td width=3D"336"><img src=3D"cid:30__=3D0ABBE538DFF003648f9=
e8a93df93869@JTax.com" border=3D"0" height=3D"1" width=3D"1" alt=3D""><=
/td></tr>
</table>
</td></tr>
</table>
<font face=3D"Arial"> --- liewkn@mydbsolve.com wrote: </font><br>
<font face=3D"Arial">&gt; Use RAID 1+0 with multi slice/volumn accordin=
g to</font><br>
<font face=3D"Arial">&gt; planned size of </font><br>
<font face=3D"Arial">&gt; table(historical/transaction/static).</font><=
br>
<font face=3D"Arial">&gt; </font><br>
<br>
<font face=3D"Arial">Why? In what way is this preferable to the setup t=
he</font><br>
<font face=3D"Arial">original poster asked for comment on? (I'd like to=
</font><br>
<font face=3D"Arial">know as well because my UNIX admin forced a RAID5 =
SAN</font><br>
<font face=3D"Arial">upon us).</font><br>
<br>
<font face=3D"Arial">Malc</font><br>
<br>
</body></html>=


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