Re: Antw: Re: Best way to create multiple TCP flows on 10 Gbps link
Mike Christie micha...@cs.wisc.edu schrieb am 27.08.2014 um 23:49 in
Nachricht 53fe5276.2060...@cs.wisc.edu:
On 08/27/2014 02:24 AM, Ulrich Windl wrote:
Learner Study learner.st...@gmail.com schrieb am 27.08.2014 um 02:13 in
Nachricht
CAP8+hKW=HApS+=vxeaaibtbbd7yzndu4squt+84se99aglc...@mail.gmail.com:
Hi Mike,
Thanks for suggestions
I think you meant,
echo 1 /sys/block/sdX/device/delete
I don't see /sys/block/sdX/device/remove in my setup.
I'm not sure: Is it echo offline /sys/block/sdX/device/state, echo
scsi
remove-single-device ${host} ${channel} ${id} ${lun} /proc/scsi/scsi, or
echo 1
/sys/class/scsi_device/${host}:${channel}:${id}:${lun}/device/delete
?
To delete a device just do
echo 1 /sys/block/sdX/device/delete
I think the confusing thing is that you don't see a delete in
/sys/block/sdX/device.
You can also do it through proc if it is enabled for your kernel.
No need to offline the device before deleting. The scsi layer will
handle the device state transitions.
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Re: Antw: Re: Best way to create multiple TCP flows on 10 Gbps link
On 08/28/2014 12:59 AM, Ulrich Windl wrote: To delete a device just do echo 1 /sys/block/sdX/device/delete I think the confusing thing is that you don't see a delete in /sys/block/sdX/device. Not sure what you mean. I do: ls /sys/block/sda/device/ block evt_media_change max_sectors rescanstate bsg generic modalias rev subsystem delete iocounterbits modelscsi_device timeout device_blocked iodone_cntpowerscsi_disk type dh_stateioerr_cnt queue_depth scsi_generic uevent driver iorequest_cnt queue_type scsi_levelvendor -- You received this message because you are subscribed to the Google Groups open-iscsi group. To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.com. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
Re: Antw: Re: Best way to create multiple TCP flows on 10 Gbps link
On 08/28/2014 11:29 AM, Mike Christie wrote: On 08/28/2014 12:59 AM, Ulrich Windl wrote: To delete a device just do echo 1 /sys/block/sdX/device/delete I think the confusing thing is that you don't see a delete in /sys/block/sdX/device. Not sure what you mean. I do: ls /sys/block/sda/device/ block evt_media_change max_sectors rescanstate bsg generic modalias rev subsystem delete iocounterbits modelscsi_device timeout device_blocked iodone_cntpowerscsi_disk type dh_stateioerr_cnt queue_depth scsi_generic uevent driver iorequest_cnt queue_type scsi_levelvendor Ah, I see. I think depending on the kernel config options used the device symlink might not even be there. -- You received this message because you are subscribed to the Google Groups open-iscsi group. To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.com. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
RE: iscsi over RBD performance tips?
Note that librados can access data from all nodes in the cluster while iSCSI will funnel the data through whatever node or proxy is hosting the iSCSI target. What does your overall network and storage layout look like? Number of systems, number and type of disks, how are Ceph journals set up, etc? From: open-iscsi@googlegroups.com [mailto:open-iscsi@googlegroups.com] On Behalf Of Wyllys Ingersoll Sent: Tuesday, August 26, 2014 2:05 PM To: open-iscsi@googlegroups.com Subject: Re: iscsi over RBD performance tips? iscsi performance to a RAM disk iscsi target using the same fio parameters, yields a 1GB/second throughput for both read and write operations, compared to about 400(r)/400(w) MB/second using an RBD based backend over a 10GB link. My fio job file looks like this (change 'randread' to 'randwrite' for the write test and modify the filename device to switch between the ramdisk and rbd). [default] rw=randread size=10g bs=1m ioengine=libaio direct=1 numjobs=1 filename=/dev/sdb runtime=600 write_bw_log=iscsiread iodepth=256 iodepth_batch=256 -- You received this message because you are subscribed to the Google Groups open-iscsi group. To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscr...@googlegroups.commailto:open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.commailto:open-iscsi@googlegroups.com. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups open-iscsi group. To unsubscribe from this group and stop receiving emails from it, send an email to open-iscsi+unsubscr...@googlegroups.com. To post to this group, send email to open-iscsi@googlegroups.com. Visit this group at http://groups.google.com/group/open-iscsi. For more options, visit https://groups.google.com/d/optout.
