mksnap_ffs takes 4-5 minutes?
Eric Anderson
anderson at centtech.com
Wed Jul 20 11:43:23 GMT 2005
Skylar Thompson wrote:
> On Tue, Jul 19, 2005 at 03:38:03PM -0500, Eric Anderson wrote:
>
>>Last week, I tried making a snapshot of one of my NFS servers'
>>partitions. I've done this one other machines before, with smaller
>>barely used partitions, and it has always been relatively snappy.
>>
>>This time, when I ran mksnap_ffs, the command took nearly 5 minutes, in
>>which time all NFS traffic was suspended, as well as all disk access on
>>the machine. After reading in the FreeBSD Implementation book
>>(McKusick), it claims it should be very very fast.
>>
>>Anyone know why it should take so long to do this snapshot? Is this
>>expected normal behaviour, or should I expect faster snapshots?
>>
>>Here's some info on the filesystem:
>>Filesystem 1K-blocks Used Avail Capacity iused ifree
>>%iused Mounted on
>>/dev/da1s1d 406234604 91799154 281936682 25% 1300303 51197103
>> 2% /scr03
>>
>>/dev/da1s1d on /scr03 (ufs, NFS exported, local, soft-updates)
>
>
> Does that filesystem have a lot of open files? I believe all busy inodes
> have to be copied in the snapshot process.
>
It probably did, however I ran the same test on a filesystem even larger
(15million used inodes, 229million inodes free), that took 30minutes,
with no open files!
Eric
--
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Eric Anderson Sr. Systems Administrator Centaur Technology
A lost ounce of gold may be found, a lost moment of time never.
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