02-07-2017 11:38 PM
Hello,
I am running a restore over FT for FS. The backup for this FS works way faster than the restore speed.
Media Server : 5240 Appliance running 773
SIZE_DATA_BUFFERS_FT : 262144
NUMBERS_DATA_BUFFERS_FT : 16 ( i have tried usinig different values but no luck in tuning restore speed.)
Client : Solaris 11 runing NBU 773
The backup selection on source client is a NFS mount. backup works @ 200 Mbps average but restore to same NFS mount starts with 16 Mbps but gradually lows down to 3-4 Mbps.
Any suggestions pointers please.
Thanks.
02-08-2017 12:02 AM
Hi
What are the write speeds on this system locally? Can you test this? I would have checked the raid card cache settings - write one.... or spoken with your storage team if the LUN where this FS do reside is from SAN...
02-08-2017 12:17 AM
The NFS i am running restore to is from ZFS storage and mounted to NBU client over NFS. Do you still want me to check cache settings ?
02-08-2017 01:08 AM
hmm NFS mounts and FT... ok.
so checking cache is not really needed... What is the write speed on this NFS - can you test it... except FT there is also some Network involved - I assume 10Gbps since you did have 200MB/s read speeds.... what about writes to this nfs from this client itsefl without involving NBU...??
02-08-2017 01:38 AM
Hi,
additional to Quebeks suggestions to test the nfs write speed without NBU you should perform a FT restore to al local filesystem (extra zfs possible?). Both test will give a hint where to search for the root cause Ft or nfs or both in combination.
ciao
tunix2k
02-08-2017 03:19 AM
thanks @tunix2k thats the same thing was on my mind. I am trying to get a local lun and then perform the restore.
However, i happend to discuss this with our storage admin and understood that the NFS mount is coming from a RAID5 ZFS volume. As we all know... RAID5 does not gives a super performance 70:30 (read:write) ratio is what i know.
I was also checking statistics which showd a slow write performance on RAID5. I think NBU is out of question for now.
Thanks for the help :)
02-08-2017 05:53 AM
Try setting NUMBER_DATA_BUFFERS_RESTORE_FT to 64 or 128.
There was a limit on the number of FT buffers before, don't know if that limitation has been lifted.
02-08-2017 06:44 AM
@Nicolai I have tried increasing NUMBER_DATA_BUFFERS_RESTORE_FT to 64 but then job has failed with Status 83. I guess thats a limitaion now.
02-08-2017 10:30 AM
My two cents, althought the document relates to VMware restore there are instructions on it to use a HD performance tester that could be useful for this case
https://www.veritas.com/support/en_US/article.TECH169860
Thank you,