Re: Multi-Actuator SAS HDD First Look

2018-04-09 Thread Douglas Gilbert
On 2018-04-09 02:17 AM, Hannes Reinecke wrote: On 04/09/2018 04:08 AM, Tim Walker wrote: On Fri, Apr 6, 2018 at 11:09 AM, Douglas Gilbert <dgilb...@interlog.com> wrote: On 2018-04-06 02:42 AM, Christoph Hellwig wrote: On Fri, Apr 06, 2018 at 08:24:18AM +0200, Hannes Reinecke wrote

Re: Multi-Actuator SAS HDD First Look

2018-04-06 Thread Douglas Gilbert
On 2018-04-06 02:42 AM, Christoph Hellwig wrote: On Fri, Apr 06, 2018 at 08:24:18AM +0200, Hannes Reinecke wrote: Ah. Far better. What about delegating FORMAT UNIT to the control LUN, and not implementing it for the individual disk LUNs? That would make an even stronger case for having a

Re: Multi-Actuator SAS HDD First Look

2018-04-05 Thread Douglas Gilbert
On 2018-04-05 07:43 PM, Tim Walker wrote: On Tue, Apr 3, 2018 at 1:46 AM, Christoph Hellwig wrote: On Sat, Mar 31, 2018 at 01:03:46PM +0200, Hannes Reinecke wrote: Actually I would propose to have a 'management' LUN at LUN0, who could handle all the device-wide commands

Re: Multi-Actuator SAS HDD First Look

2018-04-02 Thread Douglas Gilbert
On 2018-04-02 11:34 AM, Tim Walker wrote: On Sat, Mar 31, 2018 at 10:52 AM, Douglas Gilbert <dgilb...@interlog.com> wrote: On 2018-03-30 04:01 PM, Bart Van Assche wrote: On Fri, 2018-03-30 at 12:36 -0600, Tim Walker wrote: Yes I will be there to discuss the multi-LUN approach. I

Re: Multi-Actuator SAS HDD First Look

2018-03-31 Thread Douglas Gilbert
On 2018-03-30 04:01 PM, Bart Van Assche wrote: On Fri, 2018-03-30 at 12:36 -0600, Tim Walker wrote: Yes I will be there to discuss the multi-LUN approach. I wanted to get these interface details out so we could have some background and perhaps folks would come with ideas. I don't have much more

Re: Multi-Actuator SAS HDD First Look

2018-03-29 Thread Douglas Gilbert
On 2018-03-26 11:08 AM, Hannes Reinecke wrote: On Fri, 23 Mar 2018 08:57:12 -0600 Tim Walker wrote: Seagate announced their split actuator SAS drive, which will probably require some kernel changes for full support. It's targeted at cloud provider JBODs and RAID.

Re: [PATCH] scsi: resolve COMMAND_SIZE at compile time

2018-03-10 Thread Douglas Gilbert
On 2018-03-10 03:49 PM, James Bottomley wrote: On Sat, 2018-03-10 at 14:29 +0100, Stephen Kitt wrote: Hi Bart, On Fri, 9 Mar 2018 22:47:12 +, Bart Van Assche wrote: On Fri, 2018-03-09 at 23:33 +0100, Stephen Kitt wrote: +/* + * SCSI command sizes are as

Re: scsi: memory leak in sg_start_req

2018-01-10 Thread Douglas Gilbert
On 2018-01-09 11:05 AM, Dmitry Vyukov wrote: Hello, syzkaller has found the following memory leak: unreferenced object 0x88004c19 (size 8328): comm "syz-executor", pid 4627, jiffies 4294749150 (age 45.507s) hex dump (first 32 bytes): 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Re: Is the possible cross-talking between unrelated file-descriptors on bsg-device by design?

2017-09-19 Thread Douglas Gilbert
On 2017-09-19 10:56 AM, Benjamin Block wrote: Hello linux-block, I wrote some tests recently to test patches against bsg.c and bsg-lib.c, and while writing those I noticed something strange: When you use the write() and read() call on multiple file-descriptors for a single bsg-device (FC or