Public bug reported:
Redhat just fixed a bug:
https://bugzilla.redhat.com/show_bug.cgi?id=2140017
This bug complains that disk orders maybe unpredictable since 5.3.
It also affects SUSE:
https://www.suse.com/support/kb/doc/?id=000018449
I checked the latest code of ubuntu. It is identical to the buggy code.
Please check whether it affects ubuntu.
Redhat proposes the following patch:
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
--- a/drivers/scsi/sd.c (revision 71a96fee20fe50b7c204e4ed57653dafa6dfa3fd)
+++ b/drivers/scsi/sd.c (revision 32ab33b828ef7b77647c69cf192ca42d9f6566e9)
@@ -122,6 +122,14 @@
"write back, no read (daft)"
};
+static const char *sd_probe_types[] = { "async", "sync" };
+
+static char sd_probe_type[6] = "async";
+module_param_string(probe, sd_probe_type, sizeof(sd_probe_type),
+ S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(probe, "async or sync. Setting to 'sync' disables
asynchronous "
+ "device number assignments (sda, sdb, ...).");
+
static void sd_set_flush_flag(struct scsi_disk *sdkp,
struct queue_limits *lim)
{
@@ -4349,6 +4357,8 @@
goto err_out_class;
}
+ if (!strcmp(sd_probe_type, "sync"))
+ sd_template.gendrv.probe_type = PROBE_FORCE_SYNCHRONOUS;
err = scsi_register_driver(&sd_template.gendrv);
if (err)
goto err_out_driver;
However, the upstream linux developers have different opinions and have
not accepted this patch. Maybe ubuntu can propose a better solution?
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
--
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https://bugs.launchpad.net/bugs/2091137
Title:
need kernel parameter to keep disk order consistent
Status in linux package in Ubuntu:
New
Bug description:
Redhat just fixed a bug:
https://bugzilla.redhat.com/show_bug.cgi?id=2140017
This bug complains that disk orders maybe unpredictable since 5.3.
It also affects SUSE:
https://www.suse.com/support/kb/doc/?id=000018449
I checked the latest code of ubuntu. It is identical to the buggy
code. Please check whether it affects ubuntu.
Redhat proposes the following patch:
diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
--- a/drivers/scsi/sd.c (revision
71a96fee20fe50b7c204e4ed57653dafa6dfa3fd)
+++ b/drivers/scsi/sd.c (revision
32ab33b828ef7b77647c69cf192ca42d9f6566e9)
@@ -122,6 +122,14 @@
"write back, no read (daft)"
};
+static const char *sd_probe_types[] = { "async", "sync" };
+
+static char sd_probe_type[6] = "async";
+module_param_string(probe, sd_probe_type, sizeof(sd_probe_type),
+ S_IRUGO|S_IWUSR);
+MODULE_PARM_DESC(probe, "async or sync. Setting to 'sync' disables
asynchronous "
+ "device number assignments (sda, sdb, ...).");
+
static void sd_set_flush_flag(struct scsi_disk *sdkp,
struct queue_limits *lim)
{
@@ -4349,6 +4357,8 @@
goto err_out_class;
}
+ if (!strcmp(sd_probe_type, "sync"))
+ sd_template.gendrv.probe_type = PROBE_FORCE_SYNCHRONOUS;
err = scsi_register_driver(&sd_template.gendrv);
if (err)
goto err_out_driver;
However, the upstream linux developers have different opinions and
have not accepted this patch. Maybe ubuntu can propose a better
solution?
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2091137/+subscriptions
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