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List:       evms-devel
Subject:    Re: [Evms-devel] raid 0 with one disk
From:       Mike Tran <mhtran () us ! ibm ! com>
Date:       2004-09-23 15:41:29
Message-ID: 1095954088.2452.32.camel () star2 ! austin ! ibm ! com
[Download RAW message or body]

On Wed, 2004-09-22 at 20:03, Srikumar Subramanian wrote:
> Hi All,
> 
> With evmsgui, I could not create a Raid 0 with only one disk/segment.

Are you sure that you're using evms 2.4.0?  It works fine on my system.

> However I could create a Raid 0 with one disk using evms api. On top of this
> raid 0, it was possible to create container, region, volume and file system
> without any problem.
> 
> The only strange thing I observed is: When I create raid 0 with one disk,
> raid 'state' is always 'Discovered'. It was never 'Active' though I could
> access the file system which was created over my single disk - raid 0. 

This is a bug.  MD RAID0 and LINEAR region information was not set
correctly.  I checked in the fix into CVS.  Attach is the patch for evms
2.4.0.

Thanks,
Mike T.

> 
> 
> 
> Please clarify.
> 
> Thanks,
> Srikumar 
> 
> I am using evms 2.3.4; kernel 2.6.8.1
> 
> 
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["md_info.patch" (md_info.patch)]

--- evms-2.4.0/plugins/md/md_info.c	2004-07-29 16:24:41.000000000 -0500
+++ evms-2.4.0-patch/plugins/md/md_info.c	2004-09-23 10:39:24.948905736 -0500
@@ -43,12 +43,20 @@
            	               extended_info_array_t ** info_array ) {
 
 	int rc = 0;
+	storage_object_t *region;
 	int i;
 	int found = 0;
 	int info_entries;
 	extended_info_array_t * info = NULL;
 	extended_info_t *cur_info;
 
+	region = volume->region;
+	if (!region) {
+		LOG_CRITICAL("No region was created for MD volume %s.\n", volume->name);
+		LOG_EXIT_INT(EINVAL);
+		return EINVAL;
+	}
+
 	if (volume->stale_disks)
 		info_entries = NUM_INFO_ENTRIES + 1 + volume->nr_disks + volume->stale_disks;
 	else
@@ -103,7 +111,7 @@
 			}
 			strcat(message_buffer, _("Dirty"));
 		}
-		if (volume->flags & MD_ACTIVE) {
+		if (region->flags & SOFLAG_ACTIVE) {
 			if (message_buffer[0] != '\0') {
 				strcat(message_buffer, ", ");
 			}

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