Title: Re: [PERFORM] RAID stripe size question
Mikael,
On 7/18/06 6:34 AM, "Mikael Carneholm" <Mikael.Carneholm@xxxxxxxxxxxxxxx> wrote:
> However, what's more important is the seeks/s - ~530/s on a 28 disk
> array is quite lousy compared to the 1400/s on a 12 x 15Kdisk array
I'm getting 2500 seeks/second on a 36 disk SATA software RAID (ZFS, Solaris 10) on a Sun X4500:
=========== Single Stream ============
With a very recent update to the zfs module that improves I/O scheduling and prefetching, I get the following bonnie++ 1.03a results with a 36 drive RAID10, Solaris 10 U2 on an X4500 with 500GB Hitachi drives (zfs checksumming is off):
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
thumperdw-i-1 32G 120453 99 467814 98 290391 58 109371 99 993344 94 1801 4
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 +++++ +++ +++++ +++ +++++ +++ 30850 99 +++++ +++ +++++ +++
=========== Two Streams ============
Bumping up the number of concurrent processes to 2, we get about 1.5x speed reads of RAID10 with a concurrent workload (you have to add the rates together):
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
thumperdw-i-1 32G 111441 95 212536 54 171798 51 106184 98 719472 88 1233 2
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 26085 90 +++++ +++ 5700 98 21448 97 +++++ +++ 4381 97
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
thumperdw-i-1 32G 116355 99 212509 54 171647 50 106112 98 715030 87 1274 3
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 26082 99 +++++ +++ 5588 98 21399 88 +++++ +++ 4272 97
So that’s 2500 seeks per second, 1440MB/s sequential block read, 212MB/s per character sequential read.
=======================
- Luke
