On Saturday November 4, dean@xxxxxxxxxx wrote:
> i think i've got my mdadm.conf set properly for an external bitmap -- but
> it doesn't seem to work. i can assemble from the command-line fine
> though:
>
> # grep md4 /etc/mdadm/mdadm.conf
> ARRAY /dev/md4 bitmap=/bitmap.md4 UUID=dbc3be0b:b5853930:a02e038c:13ba8cdc
>
> # mdadm -A /dev/md4
> mdadm: Could not open bitmap file
Arg!!
--- .prev/config.c 2006-10-13 08:16:19.000000000 +1000
+++ ./config.c 2006-11-06 09:42:14.000000000 +1100
@@ -464,7 +464,7 @@ void arrayline(char *line)
fprintf(stderr, Name ": only specify bitmap file once. %s ignored\n",
w);
else
- mis.bitmap_file = w+7;
+ mis.bitmap_file = strdup(w+7);
} else if (strncasecmp(w, "devices=", 8 ) == 0 ) {
if (mis.devices)
Thanks!
>
> btw -- mdadm seems to create the bitmap file with world readable perms.
> i doubt it matters, but 600 would seem like a better mode.
Set you umask to 077? Maybe we could have a bitmap_perms= option
to the 'CREATE' line in mdadm.conf....
>
> hey i have another related question... external bitmaps seem to pose a bit
> of a chicken-and-egg problem. all of my filesystems are md devices. with
> an external bitmap i need at least one of the arrays to start, then have
> filesystems mounted, then have more arrays start... it just happens to
> work OK if i let debian unstale initramfs try to start all my arrays,
> it'll fail for the ones needing bitmap. then later /etc/init.d/mdadm-raid
> should start the array. (well it would if the bitmap= in mdadm.conf
> worked :)
>
> is it possible to put bitmaps on devices instead of files? mdadm seems to
> want a --force for that (because the device node exists already) and i
> haven't tried forcing it. although i suppose a 200KB partition would be
> kind of tiny.... but i could place the bitmap right beside the external
> transaction log for the filesystem on the raid5.
Create the root filesystem with --bitmap=internal, and store all the
other bitmaps on that filesystem maybe?
I don't know if it would work to have a bitmap on a device, but you
can always mkfs the device, mount it, and put a bitmap on a file
there??
NeilBrown
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