SAN filesystems won't mount at reboot

We are seeing a problem with Redhat Linux AS 3 (update 4). We have some filesystems on SAN and they won't mount at reboot. We have to exclusively probe the module interface for SAN and then mount the filesystems. In one situation, we have Q-Logic interface for the SAN, and we do modprobe qla2300 before we attempt to mount. There are other situations now where we have Hitachi SAN. The sequence is, do a mod probe for SAN, mount the SAN file systems, and then start all apps needed on those filesystems.
The problem is where to insert such commands in the boot sequence. The rc scripts wont help as they get kicked off after filesystems mount. Because the filesystems dont mount, all actions we want from boot on startup would fail.
Anyone faced this kind of problem? Appreciate your feedback and any work-around you used.

... and we do modprobe qla2300 before we attempt to mount.Question is why don't you using /etc/modprobe.conf (modules.conf in earlier linux versions)? Simply you configure modules.conf and Qlogic module will be loaded up automaticaly.
Example of modprobe.conf for qla2300:
alias scsi_hostadapter0 qla2300_conf
alias scsi_hostadapter1 qla2300
alias scsi_hostadapter2 qla2300_conf
alias scsi_hostadapter3 qla2300
post-remove qla2300 rmmod qla2300_conf
options qla2300 ql2xuseextopts=1
post-remove qla2200 rmmod qla2200_conf
The sequence is, do a mod probe for SAN, mount the SAN file systems, and then start all apps needed on those filesystems.Again, load modules automaticaly via modprobe.conf.
The problem is where to insert such commands in the boot sequence.For automatic mounting you could use automount for example. Of course you must have all relevant modules loaded (see modprobe.conf).
Other scripts belongs to rc definitely.
The rc scripts wont help as they get kicked off after filesystems mount. Because the filesystems dont mount.Why FS don't mount? Some error message?

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My USB CF Card reader is not mounting on my 2.5 GHZ Intel Core i5 iMac anymore. It was last week and worked fine to get pictures from my camera. Now it won't mount. I have tried another card reader and the same problem exists. Also tried different cards..

Hi
My USB CF (Compact Flash) Card reader is not mounting on my 2.5 GHZ Intel Core i5 iMac anymore.
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OK, restart in Safe Mode, this will clear some caches. It's possible one or more is corrupt. To restart in Safe Mode when you hear the start up tone hold down the Shift Key until you see a progress bar. Let it fully boot then restart normally and test.
Also I am assuming you have checked Finder - Preferences - General and see what boxes are checked in "Show these items on desktop." You can also mount an item in Disk Utility, simply highlight it and then look in the File menu for Mount.....

[SOLVED] Arch won't mount my hard drives correctly, problems at boot.

Sometimes (only sometimes) Arch Linux will have an error during bootup because my Linux drive gets mounted as sdb instead of sda. My NTFS Sata storage drives gets mounted in its place as sda.
When this happens, Arch Linux will stop booting at the "checking filesystems" step:
:: Checking Filesystems [BUSY]
/dev/sda3:
The superblock could not be read or does not describe a corect ext2
filesystem. If the device is valid and it really contains an ext2
filesystem (and not swap or ufs or something else), then the superblock
is corrupt, and you might try running e2fsck with an alternate superblock:
e2fsck -b 8193 <device>
[FAIL]
**************** FILESYSTEM CHECK FAILED ****************
* Please repair manually and reboot. Note that the root *
* file system is currently mounted read-only. To remount *
* it read-write type: mount -n -o remount,rw / *
* When you exit the maintenance shell the system will *
* reboot automatically. *
Give root password for maintenance
(or type Control-D to continue):
And from there i have to remount my drives manually or restart the computer. Everytime I start the computer, I simply have to hope that my Linux drive will mount as sda. It's totally hit and miss.
Now, I know that my superblock is not corrupt. fsck is failing because it is looking for my linux filesystem on sda. It is encountering my NTFS Sata drive on sda instead of the expected Linux ext filesystem.
So how do I know that this is happening?
Well, after giving the root password, it shows the root prompt
[root@(none) ~]#
and i proceed to use the lshw command to see what's up with the drives:
[root@(none) ~]# lshw -short | grep /dev/
/0/6/0.0.0 /dev/sdb disk 120GB WDC WD1200JB-00E
/0/6/0.0.0/1 /dev/sdb1 volume 101MiB Linux filesystem partition
/0/6/0.0.0/2 /dev/sdb2 volume 258MiB Linux swap volume
/0/6/0.0.0/3 /dev/sdb3 volume 7506MiB EXT4 volume
/0/6/0.0.0/4 /dev/sdb4 volume 104GiB EXT4 volume
/0/6/0.1.0 /dev/sdc disk 81GB Maxtor 6Y080P0
/0/6/0.1.0/1 /dev/sdc1 volume 76GiB Windows NTFS volume
/0/8/0.0.0 /dev/sda disk 640GB Hitachi HDT72106
/0/8/0.0.0/1 /dev/sda1 volume 596GiB Windows NTFS volume
So, clearly, this shows that my Linux drive has gotten mounted as sdb and my NTFS Sata drive has gottem mounted as sda. It's totally random: sometimes they mount vice versa and the system boots just fine.
When Arch does happen to mount itself properly as sda and the system starts successfully, then the lshw command shows this:
[root@(none) ~]# lshw -short | grep /dev/
/0/6/0.0.0 /dev/sda disk 120GB WDC WD1200JB-00E
/0/6/0.0.0/1 /dev/sda1 volume 101MiB Linux filesystem partition
/0/6/0.0.0/2 /dev/sda2 volume 258MiB Linux swap volume
/0/6/0.0.0/3 /dev/sda3 volume 7506MiB EXT4 volume
/0/6/0.0.0/4 /dev/sda4 volume 104GiB EXT4 volume
/0/6/0.1.0 /dev/sdb disk 81GB Maxtor 6Y080P0
/0/6/0.1.0/1 /dev/sdb1 volume 76GiB Windows NTFS volume
/0/8/0.0.0 /dev/sdc disk 640GB Hitachi HDT72106
/0/8/0.0.0/1 /dev/sdc1 volume 596GiB Windows NTFS volume
The above correctly mounted format shows the drives in the same order as my Hard Disk boot priority in BIOS as well as in the same order as during the initial drive detection directly following the memory test (don't know if it has anything to do with it though).
So my question is this. How do I ensure that Arch Linux mounts itself as sda ALL of the time, and not randomly?
Or should I remove my sda entries in etc/fstab and let Arch determine where my Linux filesystems are? If so, how?
It's interesting to note that GRUB is set to boot Arch Linux from hd0, which should be sda.
It's also intriguing to note that if I take out my Sata drive, I never encounter this problem.
Last edited by trusktr (2010-06-15 07:49:31)

Thanks kgas, here's what i found out so far:
Alright so after rebooting, this is what i determined:
When Linux mounts the drives incorrectly (take note of the parts in bold, the short numbers are NTFS filesystems, long numbers the Linux filesystems):
[trusktr@rocketship ~]$ ls -l /dev/disk/by-uuid
total 0
lrwxrwxrwx 1 root root 10 Jun 14 21:08 01CA836D8BE82040 -> ../../[b]sdc1[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 0ddf0e41-e7e6-4af5-b0e9-bc79a91b12eb -> ../../[b]sdb1[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 92b88528-dd0f-4c1b-bcce-54084ef2aceb -> ../../[b]sdb4[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 C838CF5838CF4462 -> ../../[b]sda1[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 cdb33de5-0100-4c5f-a9b1-5c1a444e6eac -> ../../[b]sdb3[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 d0a5d49d-169d-43ce-af0f-216dc4a9f604 -> ../../[b]sdb2[/b]
So an NTFS filesystem is mounted in sda instead of the Linux filesystem
When Linux mounts everything properly:
[trusktr@rocketship ~]$ ls -l /dev/disk/by-uuid
total 0
lrwxrwxrwx 1 root root 10 Jun 14 21:08 01CA836D8BE82040 -> ../../[b]sdb1[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 0ddf0e41-e7e6-4af5-b0e9-bc79a91b12eb -> ../../[b]sda1[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 92b88528-dd0f-4c1b-bcce-54084ef2aceb -> ../../[b]sda4[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 C838CF5838CF4462 -> ../../[b]sdc1[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 cdb33de5-0100-4c5f-a9b1-5c1a444e6eac -> ../../[b]sda3[/b]
lrwxrwxrwx 1 root root 10 Jun 14 21:08 d0a5d49d-169d-43ce-af0f-216dc4a9f604 -> ../../[b]sda2[/b]
This doesn't tell us much except that I indeed do have uuid's for all the drives.
So, i guess as kgas said, i probably need to use the uuid in fstab so that Linux always knows which hard drive is the linux drive! In that case, only the uuid for the Linux drive will be necessary. For the other drives it wouldn't matter so much i guess since they don't contain the operating system.
Alright, i'll be back to determine if this fixes it!
Last edited by trusktr (2010-06-15 06:41:25)

External HD Won't Mount - Force Ejected it and now won't mount

Hi All,
I seem to remember this happening to me before. Isn't there somewhere in the filesystem that OSX writes a file if a drive was mounted? And if you ejected a USB disk incorrectly, it cannot ever mount again?
I can't seem to find that fix anywhere.
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Hi whatstin
See the lower part of > http://support.apple.com/kb/HT1317
+1. Shut down the computer.+
+2. Disconnect all devices and all other cables, except the keyboard and mouse cable(s).+
+3. Disconnect the computer from the power outlet and wait for 3 to 5 minutes.+
+4. Plug the computer back in and turn it on.+
+5. Reconnect the device(s) (one at a time if there is more than one) and test. Test with each port if you have more than one.+
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Dennis

External disk won't mount after 10.5.7 upgrade

Hi,
I know there's problem with Buffalo external HD; mine is Lexcron 3.5'' external case and it won't mount neither. I tried PRAM restart, and if I go to Disk Utility and try to repair, it gives me the following message:
Verify and Repair volume “Dirty Hary”
** /usr/local/bin/ntfsfix has been disabled because of volume corruption issues.
** If you still want to try fixing your volume, use /usr/local/bin/ntfsfix from the command line...
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Will this issue be solved in Snow Leopard?
Thanks in advance for any kind of constructive info (I've already read threads with Buffalo issue, but I didn't find any thread giving a solution).
Sharlo

Sharlo wrote:
Hi V.K.,
Thanks for your response, can you provide some more details?
OS X has very limited support for NTFS. you need to repair the drive from windows.
How do I do that? I mean the disk works normally in Win XP and it worked normally in the previous OS X version. Btw. I've also installed NTFS-3D which allowed to write on the disk and search from spotlight (of course when it was mounted).
run chkdsk in windows and see if it finds any errors.
http://support.microsoft.com/kb/315265
it can also be that the problem is caused by ntfs-3g which is known to have a number of bugs. you can try uninstalling it or plugging in the drive in a mac without ntfs-3g installed.
there is no "issue" to solve.
Well if it worked in 10.5.6 and it works in Win XP and it doesn't work in 10.5.7 I am tempted to say 10.5.7 has an issue.
the fact that you have a problem with one drive on your particular system doesn't mean there is a problem with os x in general. an issue is when all or at least many people have a problem, not one.
furthermore, NTFS is a proprietary file system of Microsoft with closely guarded secrets about its inner workings which is why it has very limited support on other types of operating systems. apple is under no obligation to provide ANY support for something like that. programs like NTFS-3g are essentially unauthorized hacks.

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