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help / color / mirror / Atom feedRe: Adaptec/LSI/?? RAID (what about JBOD?)
3+ messages / 2 participants
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* Re: Adaptec/LSI/?? RAID (what about JBOD?)
@ 2005-06-02 21:02 mudfoot@rawbw.com
0 siblings, 1 reply; 3+ messages in thread
From: mudfoot@rawbw.com @ 2005-06-02 21:02 UTC (permalink / raw)
To: pgsql-performance; +Cc: pgsql-performance
I have a similar question about what to choose (either LSI or Adaptec U320), but
plan to use them just for JBOD drivers. I expect to be using either net or
freebsd. The system CPU will be Opteron. My impression is that both the ahd
and mpt drivers (for U320 Adaptec and LSI, respectively) are quite stable, but
not from personal experience. Like I said, I don't plan to have the cards doing
RAID in hardware. Should I be pretty safe with either choice of HBA then?
Thanks (and sorry for the semi-hijack).
Quoting Vivek Khera <vivek@khera.org>:
>
> On Jun 1, 2005, at 11:42 PM, Stacy White wrote:
>
> > "we find LSI does not work well with 4GB of RAM. Our engineering
> > find that
> > LSI card could cause system crashes. One of our customer ... has
> > found that
> > Adaptec cards works well on PostGres SQL -- they're using it as a
> > preforce
> > server with xfs and post-gress."
> >
> > Any comments? Suggestions for other RAID controllers?
> >
>
> I have twin dual opteron, 4GB RAM, LSI MegaRAID-2X cards with 8 disks
> (2@RAID0 system+pg_xlog, 6@RAID10 data) running FreeBSD 5.4-RELEASE.
>
> Works just perfectly fine under some very heavy insert/update/delete
> load. Database + indexes hovers at about 50Gb.
>
> I don't use the adaptec controllers because they don't support
> FreeBSD well (and vice versa) and the management tools are not there
> for FreeBSD in a supported fashion like they are for LSI.
>
>
> Vivek Khera, Ph.D.
> +1-301-869-4449 x806
>
>
>
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Adaptec/LSI/?? RAID (what about JBOD?)
@ 2005-06-02 23:19 Andrew McMillan <andrew@catalyst.net.nz>
parent: mudfoot@rawbw.com
0 siblings, 1 reply; 3+ messages in thread
From: Andrew McMillan @ 2005-06-02 23:19 UTC (permalink / raw)
To: mudfoot@rawbw.com; +Cc: pgsql-performance
On Thu, 2005-06-02 at 14:02 -0700, mudfoot@rawbw.com wrote:
> I have a similar question about what to choose (either LSI or Adaptec U320), but
> plan to use them just for JBOD drivers. I expect to be using either net or
> freebsd. The system CPU will be Opteron. My impression is that both the ahd
> and mpt drivers (for U320 Adaptec and LSI, respectively) are quite stable, but
> not from personal experience. Like I said, I don't plan to have the cards doing
> RAID in hardware. Should I be pretty safe with either choice of HBA then?
On the machine I mentioned earlier in this thread we use the Megaraid
for JBOD, but the card setup to use the disks that way was somewhat
confusing, requiring us to configure logical drives that in fact matched
the physical ones. The card still wanted to write that information onto
the disks, reducing the total disk space available by some amount, but
also meaning that we were unable to migrate our system from a previous
non-RAID card cleanly.
Regards,
Andrew.
-------------------------------------------------------------------------
Andrew @ Catalyst .Net .NZ Ltd, PO Box 11-053, Manners St, Wellington
WEB: http://catalyst.net.nz/ PHYS: Level 2, 150-154 Willis St
DDI: +64(4)803-2201 MOB: +64(272)DEBIAN OFFICE: +64(4)499-2267
Whereof one cannot speak, thereon one must remain silent. -- Wittgenstein
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^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: Adaptec/LSI/?? RAID (what about JBOD?)
@ 2005-06-03 00:30 mudfoot@rawbw.com
parent: Andrew McMillan <andrew@catalyst.net.nz>
0 siblings, 0 replies; 3+ messages in thread
From: mudfoot@rawbw.com @ 2005-06-03 00:30 UTC (permalink / raw)
To: pgsql-performance
Thanks, Andrew. I expect to choose between HBAs with no RAID functionality or
with the option to completely bypass RAID functionality--meaning that I'll
hopefully avoid the situation that you've described. I'm mostly curious as to
whether the driver problems described for U320 Adaptec RAID controllers also
apply to the regular SCSI drivers.
Thanks.
Quoting Andrew McMillan <andrew@catalyst.net.nz>:
> On Thu, 2005-06-02 at 14:02 -0700, mudfoot@rawbw.com wrote:
> > I have a similar question about what to choose (either LSI or Adaptec
> U320), but
> > plan to use them just for JBOD drivers. I expect to be using either net
> or
> > freebsd. The system CPU will be Opteron. My impression is that both the
> ahd
> > and mpt drivers (for U320 Adaptec and LSI, respectively) are quite stable,
> but
> > not from personal experience. Like I said, I don't plan to have the cards
> doing
> > RAID in hardware. Should I be pretty safe with either choice of HBA
> then?
>
> On the machine I mentioned earlier in this thread we use the Megaraid
> for JBOD, but the card setup to use the disks that way was somewhat
> confusing, requiring us to configure logical drives that in fact matched
> the physical ones. The card still wanted to write that information onto
> the disks, reducing the total disk space available by some amount, but
> also meaning that we were unable to migrate our system from a previous
> non-RAID card cleanly.
>
> Regards,
> Andrew.
>
> -------------------------------------------------------------------------
> Andrew @ Catalyst .Net .NZ Ltd, PO Box 11-053, Manners St, Wellington
> WEB: http://catalyst.net.nz/ PHYS: Level 2, 150-154 Willis St
> DDI: +64(4)803-2201 MOB: +64(272)DEBIAN OFFICE: +64(4)499-2267
> Whereof one cannot speak, thereon one must remain silent. -- Wittgenstein
> -------------------------------------------------------------------------
>
>
^ permalink raw reply [nested|flat] 3+ messages in thread
end of thread, other threads:[~2005-06-03 00:30 UTC | newest]
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2005-06-02 21:02 Re: Adaptec/LSI/?? RAID (what about JBOD?) mudfoot@rawbw.com
2005-06-02 23:19 ` Andrew McMillan <andrew@catalyst.net.nz>
2005-06-03 00:30 ` mudfoot@rawbw.com
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