Failed to recognize ZFS drives on Snow Leopard Server

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Failed to recognize ZFS drives on Snow Leopard Server

Post by strangeluck » Fri Sep 28, 2012 10:52 am

Is ZEVO ok for Snow Leopard Server 10.6.8? I installed it, and after restart, the OS did not recognize the ZFS drives that had worked fine under the Zevo Silver edition. (I get the offer to ignore or initialize the drives) I had no trouble uninstalling it via the System Preference panel and reinstalling the Silver edition.
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Re: Failed to recognize ZFS drives on Snow Leopard Server

Post by dbrady » Fri Sep 28, 2012 10:48 pm

It's working on a 10.6.8 machine here. It's possible the install failed. You can look at /var/log/install.log to see if there was any install issues. You can confirm that it is installed using a "zpool list". There are 3 bundles installed:

Code: Select all
$ ls -dl /System/Library/Extensions/ZFS*
drwxr-xr-x  3 root  wheel  102 Sep 14 13:22 /System/Library/Extensions/ZFSDriver.kext
drwxr-xr-x  3 root  wheel  102 Sep 14 13:22 /System/Library/Extensions/ZFSFilesystem.kext

$ ls -dl /System/Library/Filesystems/zfs*
drwxr-xr-x  3 root  wheel  102 Sep 14 13:22 /System/Library/Filesystems/zfs.fs
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Re: Failed to recognize ZFS drives on Snow Leopard Server

Post by grahamperrin » Sun Sep 30, 2012 1:15 am

strangeluck wrote:… I get the offer to ignore or initialize the drives …


If an installation of ZEVO is successful and if the symptom above recurs, please run diskutil list for the affected disk(s).
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Re: Failed to recognize ZFS drives on Snow Leopard Server

Post by strangeluck » Mon Oct 01, 2012 5:51 pm

dbrady wrote:It's working on a 10.6.8 machine here. It's possible the install failed. You can look at /var/log/install.log to see if there was any install issues. You can confirm that it is installed using a "zpool list". There are 3 bundles installed:

Code: Select all
$ ls -dl /System/Library/Extensions/ZFS*
drwxr-xr-x  3 root  wheel  102 Sep 14 13:22 /System/Library/Extensions/ZFSDriver.kext
drwxr-xr-x  3 root  wheel  102 Sep 14 13:22 /System/Library/Extensions/ZFSFilesystem.kext

$ ls -dl /System/Library/Filesystems/zfs*
drwxr-xr-x  3 root  wheel  102 Sep 14 13:22 /System/Library/Filesystems/zfs.fs


Thanks for the code to check the install. I redid the install, and got the same result: Successful install, but the preexisting ZFS drives do not mount. I can confirm that the files are there.

After a little more investigation, I have two problems:
1) My system only has 2 GB RAM. I'm surprised it didn't refuse installation, since the requirements state 4 GB minimum. But that's not the real problem...
2) Snow Leopard Server seems to be forced to run 32-bit on many, if not all, Mac Mini's. I tried:

guardian:~ craigcole$ zpool list
ZFS requires a 64-bit kernel
guardian:~ craigcole$

I'm reading you can't hold the 6-4 keys to boot 64 on the Mini, but there are hacks to make it happen. I will investigate and report back.

Craig
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Re: Failed to recognize ZFS drives on Snow Leopard Server

Post by strangeluck » Mon Oct 01, 2012 5:57 pm

grahamperrin wrote:
strangeluck wrote:… I get the offer to ignore or initialize the drives …


If an installation of ZEVO is successful and if the symptom above recurs, please run diskutil list for the affected disk(s).


I'm certain now the issue is Snow Leopard Server is running 32-bit on my Mac Mini, and ZFS requires 64-bit, but I'll show you what my output is anyway just to be throrough. All looks well, I think:

Code: Select all
guardian:~ craigcole$ diskutil list
/dev/disk0
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk0
   1:                        EFI                         209.7 MB   disk0s1
   2:                 Apple_RAID                         499.8 GB   disk0s2
   3:                 Apple_Boot Boot OSX                134.2 MB   disk0s3
/dev/disk1
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.1 GB   disk1
   1:                        EFI                         209.7 MB   disk1s1
   2:                 Apple_RAID                         499.8 GB   disk1s2
   3:                 Apple_Boot Boot OSX                134.2 MB   disk1s3
/dev/disk2
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:                  Apple_HFS Server HD              *499.8 GB   disk2
/dev/disk3
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *1.5 TB     disk3
   1:                        EFI                         209.7 MB   disk3s1
   2:                        ZFS                         1.5 TB     disk3s2
guardian:~


It appears there's nothing wrong, except that ZFS won't work while my Mini is running 32-bit (see my previous message to dbrady)

Thanks...

Craig
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Re: Failed to recognize ZFS drives on Snow Leopard Server

Post by strangeluck » Mon Oct 01, 2012 6:26 pm

strangeluck wrote:After a little more investigation, I have two problems:
1) My system only has 2 GB RAM. I'm surprised it didn't refuse installation, since the requirements state 4 GB minimum. But that's not the real problem...
2) Snow Leopard Server seems to be forced to run 32-bit on many, if not all, Mac Mini's. I tried:

guardian:~ craigcole$ zpool list
ZFS requires a 64-bit kernel
guardian:~ craigcole$

I'm reading you can't hold the 6-4 keys to boot 64 on the Mini, but there are hacks to make it happen. I will investigate and report back.

Craig


Ok, which Macs can run Snow Leopard 64-bit is here and how to determine if you're running 32-bit or 64-bit is here:

http://support.apple.com/kb/HT3770

How to toggle it is here: (Basically hold the 6-4 keys while booting) Also shows how to make booting 64-bit persistent.

http://support.apple.com/kb/HT3773

It turns out my Mac Mini is a mid 2010 model, so I was able to boot into 64 bit. And yes, my external ZFS drives mounted right up. I don't see any immediate problems running 64-bit, so I'll let it run for a while and see what happens.

Here's a GUI to make finding out which mode you're in easier and switch is here. It says that the performance benefits are there for running 64-bit, but I haven't benchmarked it or anything.

http://timesoftware.free.fr/k64enabler/

My only question is: is it ok to run with 2GB RAM? I'll add memory since I've got a good excuse now, but it might be a few days to a week.

Craig
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cross reference

Post by grahamperrin » Mon Oct 01, 2012 8:47 pm

strangeluck wrote:… My only question is: is it ok to run with 2GB RAM? I'll add memory …


Please see discussion under 4GB RAM limitation? – thanks.
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