guess who just bought a 3ware BBU on ebay...
Thanks for all the posts, consider me educated!
(on the importance of BBU on RAID controllers, anyway)
:)
Scott Marlowe wrote:
On Mon, 2006-05-01 at 13:22, Tom Arthurs wrote:
UPS does not protect against the tech behind the rack unplugging the
po
On Mon, 2006-05-01 at 13:22, Tom Arthurs wrote:
> UPS does not protect against the tech behind the rack unplugging the
> power cable, or an accidental power cycle from exercising the wrong
> switch. :) Both are probably more common causes of failure than a total
> power outage.
>
> Erik Myllym
Title: Re: [PERFORM] hardare config question
We use the 3Ware BBUs and they’re very nice, they self monitor and let you know about their capacity if it’s a problem.
- Luke
On 5/1/06 11:43 AM, "Erik Myllymaki" <[EMAIL PROTECTED]> wrote:
good points, thanks.
Tom Arthurs wrote
UPS does not protect against the tech behind the rack unplugging the
power cable, or an accidental power cycle from exercising the wrong
switch. :) Both are probably more common causes of failure than a total
power outage.
Erik Myllymaki wrote:
I have been in discussion with 3ware support and
good points, thanks.
Tom Arthurs wrote:
UPS does not protect against the tech behind the rack unplugging the
power cable, or an accidental power cycle from exercising the wrong
switch. :) Both are probably more common causes of failure than a total
power outage.
Erik Myllymaki wrote:
I have
On May 1, 2006, at 1:58 PM, Erik Myllymaki wrote:
Of course now i am in a dangerous situation - using volatile write
cache without a BBU.
It should be against the law to make RAID cards with caches that are
not battery backed.
If I were to use a UPS to ensure a soft shutdown in the eve
A UPS will make it less likely that the system will reboot and destroy
your database due to a power failure, but there are other causes for a
system reboot.
With a BBU, the only component that can fail and cause catastrophic data
loss is the RAID itself.
With a UPS, you are additionally vulnerabl
I have been in discussion with 3ware support and after adjusting some settings,
the 3ware card in RAID 1 gets better performance than the single drive. I guess
this had everything to do with the write (and maybe read?) cache.
Of course now i am in a dangerous situation - using volatile write ca
Title: Re: [PERFORM] hardare config question
Erik,
I think you have a mismatch in your Linux driver and firmware for your 3Ware card. Download a matched Linux driver and firmware from www.3ware.com and your problems should disappear.
- Luke
On 4/28/06 8:37 AM, "Erik Myllymaki&quo
rom: Mark Lewis <[EMAIL PROTECTED]>
>Sent: Apr 28, 2006 1:47 PM
>To: Vivek Khera <[EMAIL PROTECTED]>
>Cc: Pgsql performance
>Subject: Re: [PERFORM] hardare config question
>
>It's also possible that the single SATA drive you were testing (or the
>controller it
It's also possible that the single SATA drive you were testing (or the
controller it was attached to) is lying about fsync and performing write
caching behind your back, whereas your new controller and drives are
not.
You'll find a lot more info on the archives of this list about it, but
basically
On Apr 28, 2006, at 11:37 AM, Erik Myllymaki wrote:
When I had this installed on a single SATA drive running from the
PE1800's on-board SATA interface, this operation took anywhere from
65-80 seconds.
With my new RAID card and drives, this operation took 272 seconds!?
switch it to RAID10
This is a question that I also posted on Dell hardware forums, and I realize it
probably belongs there more than here. But I am thinking someone might have
some anecdotal information that could help me and this post may help someone
else down the road.
My PowerEdge 1800 (dual 3ghz Xeon, 3GB ra
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