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Home -> Community -> Mailing Lists -> Oracle-L -> Re: DISK configuration - help please.
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Raid-5 provides good redundancy and read performance but very poor write performance. Each write requires 4 i/os. Depending on your application it might be a good choice for some tablespaces, but would be a bad choice for temp, rollback, redo, and any other structure that has high write volumes. Steve McClure <steve_at_pactr.com> wrote: I am not going to be much help in regards to your initial question, but I am wondering what is wrong with RAID 5? I have had alot of success with that configuration in the past. What am I missing?
Steve McClure
----- Original Message -----
To: Multiple recipients of list ORACLE-L
Sent: Thursday, August 17, 2000 11:14 AM
> Get rid of RAID 5.
>
> Lyall
>
> At 06:46 AM 8/17/00 -0800, you wrote:
>
> >I am in the process of building two DB servers - one live and the other
> >standby. We are not overly concerned with disk capacity - but rather
with
> >speed of access.
> >
> >Our current configuration is
> >
> >primary has 10 disks in RAID 0+1
> >standby has 6 disks in RAID 5
> >
> >This is to give us 5 physical devices for production - I think a holdover
of
> >OFA guidelines.
> >
> >What I am looking for is a bit of advice on the best optin for current
> >configurations. I can add disks to this later. I am also using Veritas
VM
> >and FS and so can relayout my RAID 5 to RAID 0+1 pretty easily as well.
> >Adding disks to the system is also a breaze.
> >
> >All of these disks are in one FS mounted to /u01 .. .for easy management
on
> >our site we elected one mount point and one very expandable FS.
> >
> >I am considering breaking my configuration and going with 8 disks in 0+1
for
> >both systems - or going with 10 and 6 but both in 0+1 - I don't think
that
> >RAID 5 is a good idea ever - even for a standby system, but there is some
> >pressure to have 5 physical devices and RAID 5 with 6 gives us that
too...
> >
> >
> >Anybody out there willing to throw two cents my way?
> >
> >
> >thanks!
> >
> >adam
> >--
> >Author: Adam Turner
> > INET: ATurner_at_concretemedia.com
> >
> >Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> >San Diego, California -- Public Internet access / Mailing Lists
> >--------------------------------------------------------------------
> >To REMOVE yourself from this mailing list, send an E-Mail message
> >to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> >the message BODY, include a line containing: UNSUB ORACLE-L
> >(or the name of mailing list you want to be removed from). You may
> >also send the HELP command for other information (like subscribing).
>
> --
> Author: Lyall Barbour
> INET: lbarbour_at_stanford.edu
>
> Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051
> San Diego, California -- Public Internet access / Mailing Lists
> --------------------------------------------------------------------
> To REMOVE yourself from this mailing list, send an E-Mail message
> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
> the message BODY, include a line containing: UNSUB ORACLE-L
> (or the name of mailing list you want to be removed from). You may
> also send the HELP command for other information (like subscribing).
>
-- Author: Steve McClure INET: steve_at_pactr.com Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing). --------------------------------- Do You Yahoo!? Yahoo! Mail - Free email you can access from anywhere! --0-1957747793-966883613=:27910 Content-Type: text/html; charset=us-ascii <P> Raid-5 provides good redundancy and read performance but very poor write performance. Each write requires 4 i/os. Depending on your application it might be a good choice for some tablespaces, but would be a bad choice for temp, rollback, redo, and any other structure that has high write volumes. <P> <B><I>Steve McClure <steve_at_pactr.com></I></B> wrote: <BR> <BLOCKQUOTE style="BORDER-LEFT: #1010ff 2px solid; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">I am not going to be much help in regards to your initial question, but I am<BR>wondering what is wrong with RAID 5? I have had alot of success with that<BR>configuration in the past. What am I missing?<BR><BR>Steve McClure<BR>----- Original Message -----<BR>To: Multiple recipients of list ORACLE-L <ORACLE-L_at_FATCITY.COM><BR>Sent: Thursday, August 17, 2000 11:14 AM<BR><BR><BR>> Get rid of RAID 5.<BR>><BR>> Lyall<BR>><BR>> At 06:46 AM 8/17/00 -0800, you wrote:<BR>><BR>> >I am in the process of building two DB servers - one live and the other<BR>> >standby. We are not overly concerned with disk capacity - but rather<BR>with<BR>> >speed of access.<BR>> ><BR>> >Our current configuration is<BR>> ><BR>> >primary has 10 disks in RAID 0+1<BR>> >standby has 6 disks in RAID 5<BR>> ><BR>> >This is to give us 5 physical device! s for production - I think a holdover<BR>of<BR>> >OFA guidelines.<BR>> ><BR>> >What I am looking for is a bit of advice on the best optin for current<BR>> >configurations. I can add disks to this later. I am also using Veritas<BR>VM<BR>> >and FS and so can relayout my RAID 5 to RAID 0+1 pretty easily as well.<BR>> >Adding disks to the system is also a breaze.<BR>> ><BR>> >All of these disks are in one FS mounted to /u01 .. .for easy management<BR>on<BR>> >our site we elected one mount point and one very expandable FS.<BR>> ><BR>> >I am considering breaking my configuration and going with 8 disks in 0+1<BR>for<BR>> >both systems - or going with 10 and 6 but both in 0+1 - I don't think<BR>that<BR>> >RAID 5 is a good idea ever - even for a standby system, but there is some<BR>> >pressure to have 5 physical devices and RAID 5 with 6 gives us that<BR>too...<BR>> ><BR>> ><BR>> >Anyb! ody out there willing to throw two cents my way?<BR>> ><BR>> ><BR>> >thanks!<BR>> ><BR>> >adam<BR>> >--<BR>> >Author: Adam Turner<BR>> > INET: ATurner_at_concretemedia.com<BR>> ><BR>> >Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051<BR>> >San Diego, California -- Public Internet access / Mailing Lists<BR>> >--------------------------------------------------------------------<BR>> >To REMOVE yourself from this mailing list, send an E-Mail message<BR>> >to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in<BR>> >the message BODY, include a line containing: UNSUB ORACLE-L<BR>> >(or the name of mailing list you want to be removed from). You may<BR>> >also send the HELP command for other information (like subscribing).<BR>><BR>> --<BR>> Author: Lyall Barbour<BR>> INET: lbarbour_at_stanford.edu<BR>><BR>> Fat City Network Services -- (858) 53! 8-5051 FAX: (858) 538-5051<BR>> San Diego, California -- Public Internet access / Mailing Lists<BR>> --------------------------------------------------------------------<BR>> To REMOVE yourself from this mailing list, send an E-Mail message<BR>> to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in<BR>> the message BODY, include a line containing: UNSUB ORACLE-L<BR>> (or the name of mailing list you want to be removed from). You may<BR>> also send the HELP command for other information (like subscribing).<BR>><BR><BR>-- <BR>Author: Steve McClure<BR>INET: steve_at_pactr.com<BR><BR>Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051<BR>San Diego, California -- Public Internet access / Mailing Lists<BR>--------------------------------------------------------------------<BR>To REMOVE yourself from this mailing list, send an E-Mail message<BR>to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in<BR>the message BODY, inclu! de a line containing: UNSUB ORACLE-L<BR>(or the name of mailing list you want to be removed from). You may<BR>also send the HELP command for other information (like subscribing).</BLOCKQUOTE><p><br><hr size=1><b>Do You Yahoo!?</b><br> <a href="http://mail.yahoo.com/">Yahoo! Mail</a> - Free email you can access from anywhere!Received on Mon Aug 21 2000 - 13:46:53 CDT
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