* [bug report]scsi: drive letter drift problem
@ 2021-07-12 4:47 Wenchao Hao
2021-07-12 9:34 ` Stefan Hajnoczi
0 siblings, 1 reply; 4+ messages in thread
From: Wenchao Hao @ 2021-07-12 4:47 UTC (permalink / raw)
To: James E.J. Bottomley, Martin K. Petersen, Michael S. Tsirkin,
Jason Wang, Paolo Bonzini, Stefan Hajnoczi, linux-scsi,
virtualization, linux-kernel
Cc: Zhiqiang Liu, Wu Bo, linfeilong, yuzhanzhan, haowenchao
We deploy two SCSI disk in one SCSI host(virtio-scsi bus) for one
machine, whose ids are [0:0:0:0] and [0:0:1:0].
Mostly, the device letter are assigned as following after reboot:
[0:0:0:0] --> sda
[0:0:1:0] --> sdb
While in rare cases, the device letter shown as following:
[0:0:0:0] --> sdb
[0:0:1:0] --> sda
Could we guarantee "sda" is assigned to [0:0:0:0] and "sdb" is assigned
to [0:0:1:0] or not?
If we can, then how?
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [bug report]scsi: drive letter drift problem
2021-07-12 4:47 [bug report]scsi: drive letter drift problem Wenchao Hao
@ 2021-07-12 9:34 ` Stefan Hajnoczi
0 siblings, 0 replies; 4+ messages in thread
From: Stefan Hajnoczi @ 2021-07-12 9:34 UTC (permalink / raw)
To: Wenchao Hao
Cc: James E.J. Bottomley, Martin K. Petersen, Michael S. Tsirkin,
Jason Wang, Paolo Bonzini, linux-scsi, virtualization,
linux-kernel, Zhiqiang Liu, Wu Bo, linfeilong, yuzhanzhan
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On Mon, Jul 12, 2021 at 12:47:05PM +0800, Wenchao Hao wrote:
> We deploy two SCSI disk in one SCSI host(virtio-scsi bus) for one machine,
> whose ids are [0:0:0:0] and [0:0:1:0].
>
> Mostly, the device letter are assigned as following after reboot:
> [0:0:0:0] --> sda
> [0:0:1:0] --> sdb
>
> While in rare cases, the device letter shown as following:
> [0:0:0:0] --> sdb
> [0:0:1:0] --> sda
>
> Could we guarantee "sda" is assigned to [0:0:0:0] and "sdb" is assigned to
> [0:0:1:0] or not?
> If we can, then how?
Is there a stable ID that you can use in /dev/disk/by-*?
Stefan
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [bug report]scsi: drive letter drift problem
@ 2021-07-12 9:34 ` Stefan Hajnoczi
0 siblings, 0 replies; 4+ messages in thread
From: Stefan Hajnoczi @ 2021-07-12 9:34 UTC (permalink / raw)
To: Wenchao Hao
Cc: Wu Bo, Martin K. Petersen, linux-scsi, Michael S. Tsirkin,
James E.J. Bottomley, linux-kernel, virtualization, linfeilong,
Zhiqiang Liu, yuzhanzhan, Paolo Bonzini
[-- Attachment #1.1: Type: text/plain, Size: 602 bytes --]
On Mon, Jul 12, 2021 at 12:47:05PM +0800, Wenchao Hao wrote:
> We deploy two SCSI disk in one SCSI host(virtio-scsi bus) for one machine,
> whose ids are [0:0:0:0] and [0:0:1:0].
>
> Mostly, the device letter are assigned as following after reboot:
> [0:0:0:0] --> sda
> [0:0:1:0] --> sdb
>
> While in rare cases, the device letter shown as following:
> [0:0:0:0] --> sdb
> [0:0:1:0] --> sda
>
> Could we guarantee "sda" is assigned to [0:0:0:0] and "sdb" is assigned to
> [0:0:1:0] or not?
> If we can, then how?
Is there a stable ID that you can use in /dev/disk/by-*?
Stefan
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: [bug report]scsi: drive letter drift problem
2021-07-12 9:34 ` Stefan Hajnoczi
(?)
@ 2021-07-13 1:27 ` Wenchao Hao
-1 siblings, 0 replies; 4+ messages in thread
From: Wenchao Hao @ 2021-07-13 1:27 UTC (permalink / raw)
To: Stefan Hajnoczi
Cc: James E.J. Bottomley, Martin K. Petersen, Michael S. Tsirkin,
Jason Wang, Paolo Bonzini, linux-scsi, virtualization,
linux-kernel, Zhiqiang Liu, Wu Bo, linfeilong, yuzhanzhan
On 2021/7/12 17:34, Stefan Hajnoczi wrote:
> On Mon, Jul 12, 2021 at 12:47:05PM +0800, Wenchao Hao wrote:
>> We deploy two SCSI disk in one SCSI host(virtio-scsi bus) for one machine,
>> whose ids are [0:0:0:0] and [0:0:1:0].
>>
>> Mostly, the device letter are assigned as following after reboot:
>> [0:0:0:0] --> sda
>> [0:0:1:0] --> sdb
>>
>> While in rare cases, the device letter shown as following:
>> [0:0:0:0] --> sdb
>> [0:0:1:0] --> sda
>>
>> Could we guarantee "sda" is assigned to [0:0:0:0] and "sdb" is assigned to
>> [0:0:1:0] or not?
>> If we can, then how?
> Is there a stable ID that you can use in /dev/disk/by-*?
>
> Stefan
Thanks, we found /dev/disk/by-path may be helpful
^ permalink raw reply [flat|nested] 4+ messages in thread
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2021-07-12 4:47 [bug report]scsi: drive letter drift problem Wenchao Hao
2021-07-12 9:34 ` Stefan Hajnoczi
2021-07-12 9:34 ` Stefan Hajnoczi
2021-07-13 1:27 ` Wenchao Hao
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