ufslogging and disksuite under solaris 8

[jmiturbe]

Hello,

I have to install and configure disksuite on an E450 server running solaris8 and "build" some mirrors.

I also want to use ufslogging feature.My questions are:

1.- Do I have to use solaris 8 ufs logging option at /etc/vfstab or do I have to use disk suite´s ufslogging?
PROS and CONS?

2.- If using disksuite`s logging, must i use a separate metadevice for logging, or can it be done on the same filesystems where I want this feature to be running?

Thanks in advance,

jmiturbe

 

[Apricot]

UFS logging and Disksuite's trans metadevice logging serve the same purpose which is to store the UFS transactions in a log before the transactions are applied to the file system. However the two have some differences as listed below:

a. The Disksuite logging is available with the Solstice Disksuite software while the UFS logging is part of the base OS from Solaris 7.

b. The logging device to which the UFS transactions are initially stored is a separate metadevice object in Disksuite. The log is allocated from free blocks on the same file system with UFS logging.

c. Since the logging device is a separate device with Disksuite, its size can be changed after configuration and also can be mirrored for additional reliability. This is not possible with UFS logging as the logging device is part of the UFS filesystem.

d. A single logging device can be shared between trans metadevices with Disksuite. The log is allocated for every individual UFS filesystem in case of UFS logging.

e. The UFS transactions can be flushed out of the log and written to the master file system using -f option of "lockfs" command with UFS logging. This option is not available with disksuite logging.

 

[jmiturbe]

Hello again,

Apricot, thanks for the fast answer!!!! Good info, but I still don't know what to do. I'll explain my needs a bit more:

I won't use soft-partitions, so my slice (and metadevice) quantity is limited. I don't want to introduce "complex" configurations, because I'm not going to manage this host, only install and configure (other machines on the same network without volume management software, are using solaris ufslogging) .

This is why I'm considering to use Disksuite without trans metadevice, and include this feature with Solaris UFS, but working "over" disksuite mirrors. Is this configuration correct?

Thanks again,

jmiturbe

 

[Apricot]

hi jmiturbe

Sorry, I can't help you! But I found some links, perhaps they can help you:

http://aa11.cjb.net/sun_managers/2000/10/msg00075.html

http://docs.sun.com/db/doc/806-3204/6jccb3ga6?a=view

http://dbforums.com/arch/128/2002/7/424026

greetz Apricot