Harddrive performance: Promise SATA RAID under Redhat 9



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Re: Harddrive performance: Promise SATA RAID under Redhat 9

Postby acher » Sun, 07 Dec 2003 10:35:22 GMT

In article < XXXX@XXXXX.COM >,
 Michael Heiming <michael+ XXXX@XXXXX.COM > writes:

|> That's pretty good, AFAIR I don't get much more out of 15K SCSI
|> disks with hw RAID controller. But then, those hdparm tests don't
|> tell much, real world I/O is different, you could try iozone or
|> alike, search freshmeat.net, there are dozens of I/O benchmarks.

Do you know a site which actually has comparisons of different configurations?
The  numbers are quite useless without any relation...
|> To get more out of your disks, you need to have multiple RAID1/5
|> disks and stripe over them RAID0 using lvm.

 Timing buffered disk reads:  472 MB in  3.01 seconds = 156.86 MB/sec

;-) 3Ware SATA controller, RAID-5 with 5*250GB Maxtor disks. But I'd like to
know how this setup compares to real/expensive RAID/NAS-systems...

         Georg Acher,  XXXX@XXXXX.COM 
          http://www.**--****.com/ ~acher
         "Oh no, not again !" The bowl of petunias

Re: Harddrive performance: Promise SATA RAID under Redhat 9

Postby Michael Heiming » Wed, 10 Dec 2003 03:34:41 GMT


Yep, don't know of any, but beside that AFAIK you don't get IDE
disks with 15K, the SCSI bus is what makes it obvious that if you
need real I/O you should get SCSI. Is it even possible with IDE
to add/remove hds to the system while running?

While this looks good, it doesn't say much, hdparm reads the data
AFAIK serial from the disk. On some db server there might be
numerous queries/updates running at once, despite all caching
happening you will need to write/read physical some time.

Michael Heiming

Remove +SIGNS and www. if you expect an answer, sorry for 
inconvenience, but I get tons of SPAM

Re: Harddrive performance: Promise SATA RAID under Redhat 9

Postby Ken Kauffman » Thu, 11 Dec 2003 08:14:39 GMT

FYI.  The 3ware is hot swappable.  I answer my own question.  But I am still
concerned about drive construction and reliability in a data center.

ken k

Re: Harddrive performance: Promise SATA RAID under Redhat 9

Postby Michael Heiming » Sun, 14 Dec 2003 06:33:44 GMT


Yep, hot swap-able, but what about adding or removing drives,
configuring raid sets from Linux, rescanning the bus to add new
disks while running, like you can do with SCSI if you happen to
have the proper tool, which are available for many SCSI RAID

Michael Heiming

Remove +SIGNS and www. if you expect an answer, sorry for 
inconvenience, but I get tons of SPAM

Similar Threads:

1.Harddrive performance: Promise SATA RAID under Redhat 9

Hey all

I have just installed some new servers here at work and am wanting to check
and optimize the hard drive performance as I think it is a bit dodgy.

The system specs are:

- P4 3GHz (with HyperThreading)
- 2 x Seagate 120GB SATA drives (in a RAID 1 - mirrored RAID)
- Asus P4C-E Deluxe mobo
- Promise FastTrack (20)378 onboard SATA RAID controller
- RedHat 9 (customized) - 2.4.20-smp kernel (damn those RAID drivers)
- Currently using the Promise.com's FastTrak TX4000/376/378/S150 TX Series
Linux Driver

The drives are mirrored for data security but the read speed we are gettting
seems slow. This is especially the case reading a number of small files.
"hdparm -tT /dev/sda" returns

  Timing buffer-cache reads:   128 MB in  0.13 seconds =984.62 MB/sec
  Timing buffered disk reads:  64 MB in  1.39 seconds = 45.71 MB/sec

I have looked around the net for harddrive optimization pointers but they
all seem to be for single ATA/IDE drives. Just wondering if anyone had some
ideas. For instance, would switching to the native ATARAID driver be a
better option.. at least it would let us upgrade the kernel I guess.



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2.Poor SATA / RAID performance (2.6.11 and promise SATAII150 TX4)

3.Promise 378 SATA Raid controller stripe configuration MBFastTrack78

I need to switch from the ICHR controller to the Promise controller on my
Asus P4C800-E Deluxe.  However, I am part way through installing the ICHR
controller, and don't know how to start again from scratch.  The array was
built for the ICHR, but I was unable to install a Linux driver for ICHR. 
I found the Promise driver, but MBFastTrack78 does not seem to run, and I
have found no way to start it.  Ctrl-F does not seem to work.

I think I need to delete the array and build it again.  How can I do this?

4.Promise SATA-Raid with Kernel 2.6


does anybody know if there is posibility to install SuSE 9.1 on a 
Promise SATA (onboard Promise 376 MSI board) controller WITHOUT having 
to build a custom kernel. Half a year ago I wrode an email to the 
promise support and they said that there will be a driver by september. 
But I can't find a proper driver on the promise page.


5.Promise SATA RAID and installing 6.1

If I configure a mirrored RAID on two drives and try and install 6.1,
it cold reboots at some poiint in the initial boot loader stage (the
text isn't on the screen long enough to read).

If I delete the mirror, FB boots correctly and offers either of the two
drives to install upon.

I've not had this problem installing on either HPT or SIL PATA raid
controllers but this is the first SATA one I've tried. Do I need to
create a partition prior to installing FB ?

6. poor hdparm performance with Promise SX4 SATA controller and kernel 2.4.28

7. SATA with RedHat on Intel S875WP1-E Motherboard with Promise PDC20319

8. Adding Promise SATA 150TX2Plus drivers to RedHat 8.0

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