Can fssnap be used as a compression tool (Solaris 10)?
Friends, I am learning the working of fssnap command.
Suppose there is a directory named /datadir which is of size 500mb.
I had taken the snapshot by means of the following command:
Code:
#fssnap -F ufs -o bs=/snapshotdir /datadir
{ it shows the o/p as
/dev/fssnap/0 }
My question is if I look at the size of /snapshotdir/snapshot0 file it is only in few KB.
But when I mount the /dev/fssnap/0 to some temporary directory its size is of 500mb and data could also be accessed.
Please clarify how this works...Can we say that fssnap can be used as a compression tool?
sorry if this is a stupid question.
fssnap is tool used to "freeze" state of filesystem, so it can be backuped. When snapshot is created it will contain image of filesystem like it was in time of creation. File you mentioned (/snapshotdir/snapshot0) contains backstore data that is needed for this purpose, like when you change some files in snapshotted filesystem, then original data is copied to the /snapshotdir/snapshot0, so it is possible to see old data when mounting /dev/fssnap/0. So when there are no changes done to filesystem, then there is no data written in /snapshotdir/snapshot0. As for mounting /dev/fssnap/0... It is mostly done by mounting unchanged data from original filesystem in read only mode, and then applying backup bits from backstore file when something changed in data after snapshot creation.
Hi,
I have used Solaris but new to ZFS. I need to backup the root volume using fssnap.
zpool list
NAME SIZE ALLOC FREE CAP HEALTH ALTROOT
pool5 808G 552G 256G 68% ONLINE -
rpool 136G 20.9G 115G 15% ONLINE -
zfs list
NAME USED... (3 Replies)
Hello all.
I am new hear and would like to ask a question regarding to the Solaris Crash Analysis Tool.
We are analyzing the results of "thread summary" but not quite sure what the asterisk represents.
Following are the items that asterisk were attached.
50* threads sleeping on a semaphore (49... (1 Reply)
Hi all!
Here's my situation:
I need to backup a running system before I can bring it down
I've tried performing a ufsdump while it's in multi-user mode but my ufsdump fails because there is too much activity on the system.
So I read that I could use fssnap to create a snapshot of (in my... (3 Replies)
Hello to everyboyd i have a list of filesystem that i want to do a fssnap the idea is the bakcup
/
/var
/dbo
/Free
The logic is when i do a fssnap of / or /dbo or /Free the file that generetes the fssnap goes to /var but when i do a fssnap of /var goes to
/(and some folder). Can anybody... (0 Replies)
Hello All,
I am confused about the below outputs when I have tried fssnap output using diff path.
bash-3.00# /usr/lib/fs/ufs/fssnap -i ============>> o/p 1
Snapshot number : 0
Block Device : /dev/fssnap/0
Raw Device :... (0 Replies)
Hi All,
I was wondering if there is any Network Monitoring Tool for Solaris 10 to monitor a network having hybrid operating systems. I just googled it without success.
Hope, experts will guide me to get it.
Thanks,
Deepak (7 Replies)
Hi All,
I was wondering if there is any Network Monitoring Tool for Solaris 10 to monitor a network having hybrid operating systems. I just googled it without success.
Hope, experts will guide me to get it.
Thanks,
Deepak (0 Replies)
For some reason when I try to take a snapshot of the root slice on a particular machine I get an ioctl 22 error. I can't seem to find much on the problem by searching the internet other than some realtime processes such as ntp that use mlock can cause this to happen. I tried running it with truss... (2 Replies)
Is there something similar on Solaris to windows NTFS compression where by the OS handles compression\decompression?This applies to my college web account so I can't change the partition setup etc.
Thanks,
Ger. (1 Reply)
