Re: IO transfer limits

2007-01-12 Thread john clyne
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Re: IO transfer limits

2007-01-11 Thread Stefan Richter
Douglas Gilbert wrote: john clyne wrote: What do the different hostX in /sys/class/scsi_host corespond to? There are seven hostX directories, 5 with sg_tablesize set to 128 and two set to 255. A Linux host is a SCSI initiator port (e.g. FC) or a SCSI initiator device (e.g. SAS). Another way

Re: IO transfer limits

2007-01-11 Thread john clyne
unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html -- View this message in context: http://www.nabble.com/IO-transfer-limits-tf2953389.html#a8284792 Sent from the linux-scsi mailing list archive

Re: IO transfer limits

2007-01-11 Thread Douglas Gilbert
Stefan Richter wrote: Douglas Gilbert wrote: john clyne wrote: What do the different hostX in /sys/class/scsi_host corespond to? There are seven hostX directories, 5 with sg_tablesize set to 128 and two set to 255. A Linux host is a SCSI initiator port (e.g. FC) or a SCSI initiator device

Re: IO transfer limits

2007-01-11 Thread Stefan Richter
Douglas Gilbert wrote: There are cheap external boxes out there that have 1394, USB and (e)SATA interfaces. I wonder what would happen if one tried to use two interfaces connected to different machines at the same time :-) AFAIK these are all based on the OXUF924 series of bridge chips. Their

Re: IO transfer limits

2007-01-11 Thread James Bottomley
On Thu, 2007-01-11 at 11:48 -0800, john clyne wrote: So what's the best course of action for increasing the 512kb IO transfer size limit, changing SCSI_MAX_PHYS_SEGMENTS (currently 128 and apparently can be set no greater than 256), or increasing the page size? Or is there another option.

IO transfer limits

2007-01-10 Thread john clyne
), but I don't see any relevent parameters. I'm running RHEL 4.0 with a 2.6.9-34 kernel. Any pointers would be greatly appreciated. cheers - jc -- View this message in context: http://www.nabble.com/IO-transfer-limits-tf2953389.html#a8260533 Sent from the linux-scsi mailing list archive at Nabble.com

Re: IO transfer limits

2007-01-10 Thread Mike Christie
john clyne wrote: Can anyone give me some guidance on where in the IO stack I might be running into a 512KB limit on IO transfer sizes to an external FC device? I've checked IO scheduler parameter (/sys/block/dev/queue/{max_sectors_kb,max_hw_sectors_kb}. Both are set to 32767. I'm using

Re: IO transfer limits

2007-01-10 Thread Douglas Gilbert
john clyne wrote: Can anyone give me some guidance on where in the IO stack I might be running into a 512KB limit on IO transfer sizes to an external FC device? I've checked IO scheduler parameter (/sys/block/dev/queue/{max_sectors_kb,max_hw_sectors_kb}. Both are set to 32767. I'm using

Re: IO transfer limits

2007-01-10 Thread john clyne
be clustered you will end up with 4K * 128. - To unsubscribe from this list: send the line unsubscribe linux-scsi in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html -- View this message in context: http://www.nabble.com/IO-transfer

Re: IO transfer limits

2007-01-10 Thread Douglas Gilbert
to several kernel people that there were users out there that needed larger IO transfer limits. So I suggest that you talk the the management and tell them why you need higher limits. Linux is retarded in this area. Doug Gilbert Mike Christie wrote: john clyne wrote: Can anyone give me some guidance