Re: [CentOS] slow i/o with a raid 50 on a 3ware controller

2014-08-13 Thread Steven Tardy
On Wed, Aug 6, 2014 at 2:44 PM, Chuck Campbell wrote: > I have a raid 50 array on a 3ware controller. The box is running centos > 6.5 and > the file system is ext4. > > I'm going to try some other filesystems, but could anyone suggest any > alternative raid setups as well as stripe sizes I should

Re: [CentOS] slow i/o with a raid 50 on a 3ware controller

2014-08-09 Thread Markus Falb
On 7.8.2014 03:04, John R Pierce wrote: > On 8/6/2014 5:32 PM, Markus Falb wrote: >> Do you have barriers enabled? >> Just another shot in the dark, but 5 didn't have that. >> If you have battery backed Cache with your Controller, you can safely >> disable barriers anyway. > are you sure about this

Re: [CentOS] slow i/o with a raid 50 on a 3ware controller

2014-08-06 Thread John R Pierce
On 8/6/2014 5:32 PM, Markus Falb wrote: > Do you have barriers enabled? > Just another shot in the dark, but 5 didn't have that. > If you have battery backed Cache with your Controller, you can safely > disable barriers anyway. are you sure about this? thats not my understanding. What I've been t

Re: [CentOS] slow i/o with a raid 50 on a 3ware controller

2014-08-06 Thread Markus Falb
On 6.8.2014 20:44, Chuck Campbell wrote: > I have a raid 50 array on a 3ware controller. The box is running centos 6.5 > and > the file system is ext4. > > I'm going to try some other filesystems, but could anyone suggest any > alternative raid setups as well as stripe sizes I should try? > >

Re: [CentOS] slow i/o with a raid 50 on a 3ware controller

2014-08-06 Thread Valeri Galtsev
Check if writing cache is enabled in 3ware controller configuration. You may want to have battery backup of controller RAM for that (otherwise sudden power loss will lead to loss of cache which will make a disaster on RAID level). 3ware controllers resist to enable cache in absence of battery backu

[CentOS] slow i/o with a raid 50 on a 3ware controller

2014-08-06 Thread Chuck Campbell
I have a raid 50 array on a 3ware controller. The box is running centos 6.5 and the file system is ext4. I'm going to try some other filesystems, but could anyone suggest any alternative raid setups as well as stripe sizes I should try? The old server uses the same controller on a centos 5.10 s