On Mon, 13 Dec 2004 09:23:13 -0800, Joshua D. Drake
[EMAIL PROTECTED] wrote:
RAID 10 will typically always outperform RAID 5 with the same HD config.
Isn't RAID10 just RAID5 mirrored? How does that speed up performance?
Or am I missing something?
-- Mitch
---(end of
Mitch Pirtle wrote:
On Mon, 13 Dec 2004 09:23:13 -0800, Joshua D. Drake
[EMAIL PROTECTED] wrote:
RAID 10 will typically always outperform RAID 5 with the same HD config.
Isn't RAID10 just RAID5 mirrored? How does that speed up performance?
Or am I missing something?
-- Mitch
Hi Mitch,
Nope,
Madison Kelly wrote:
Nope, Raid 10 (one zero) is a mirror is stripes, no parity. with r10
Woops, that should be mirror of stripes.
By the way, what you are thinking of is possible, it would be 51 (five
one; a raid 5 built on mirrors) or 15 (a mirror of raid 5 arrays).
Always be careful, 10
Madison Kelly [EMAIL PROTECTED] writes:
Without it, specially in a failure state, the performance can collapse as
the CPU performs all that extra math.
It's really not the math that makes raid 5 hurt. It's that in order to
calculate the checksum block the raid controller needs to read in the
You are right, I now remember that setup was originally called RAID
10 plus 1, and I believe is was an incorrect statement from an
overzealous salesman ;-)
Thanks for the clarification!
- Mitch
On Mon, 03 Jan 2005 15:19:04 -0500, Madison Kelly [EMAIL PROTECTED] wrote:
Madison Kelly wrote:
...and on Mon, Jan 03, 2005 at 03:44:44PM -0500, Mitch Pirtle used the keyboard:
You are right, I now remember that setup was originally called RAID
10 plus 1, and I believe is was an incorrect statement from an
overzealous salesman ;-)
Just an afterthought - that could well be the
Joshua D. Drake wrote:
An Opteron, properly tuned with PostgreSQL will always beat a Xeon
in terms of raw cpu.
RAID 10 will typically always outperform RAID 5 with the same HD config.
Fibre channel in general will always beat a normal (especially an LSI)
raid.
Dell's suck for PostgreSQL.
Does
BS == Bo Stewart [EMAIL PROTECTED] writes:
BS The servers listed above are the dell 2650's which have perc 3
BS controllers. I have seen on this list where they are know for not
BS performing well. So any suggestions for an attached scsi device would
BS be greatly appreciated. Also, any
Vivek,
Dual Xeon 64bit with built-in 6-disk RAID10 or RAID5 (LSI RAID card)
Dual Opteron 64bit with built-in 6-disk RAID10 or RAID5 (LSI RAID card)
Dual Opteron 64bit with external RAID via fibre channel (eg, nstor)
Opteron over Xeon, no question.Not only are the Opterons
However, I keep getting conflicting advice. My choices are along
these lines:
Dual Xeon 64bit with built-in 6-disk RAID10 or RAID5 (LSI RAID card)
Dual Opteron 64bit with built-in 6-disk RAID10 or RAID5 (LSI RAID card)
Dual Opteron 64bit with external RAID via fibre channel (eg, nstor)
An
Bo,
2 - 2.4 Ghz Xeon processors
4GB ram
4 36gb 1rpm scsi drives configured for raid 10
Hopefully you've turned OFF hyperthreading?
gains can I expect on average from swapping from 4 disk raid 10 to 14 disk
raid 10? Could I expect to see 40 - 50% better throughput.
This is so
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