This post is more than 5 years old
66 Posts
0
3116
February 27th, 2012 03:00
How to increase the PAX parameter "maxCifsBufferLengthInKB" in DART 5.6
I'd faced NDMP backup problem with one CIFS file system where security descriptor size has exceeded 32KB which is limited for NDMP backups by default. There is a Primus solution: emc134597 which suggests to change the pax parameter “maxCifsBufferLengthInKB” from default 32 kb to 64 kb whereas the maximum value could be 128 kb. But I'm not able to find the parameter. Infact following command output reveals the parameter "maxCifsBufferLengthInKB" as unsupported argument. Our current DART version is 5.6.51-3.
[admin@XXXXXX ~]$ server_param server_2 -facility PAX -info maxCifsBufferLengthInKB
server_2 :
Error 2111: server_2 : Unsupported argument: maxCifsBufferLengthInKB
Can anyone guide me how to set this to 64KB ?
SAMEERK1
296 Posts
0
February 27th, 2012 03:00
Hi,
you need to edit the param file of the data mover
$ vi /nas/server/slot_x/param
add the line as mentioned in the article
param =
Sameer Kulkarni
Peter_EMC
674 Posts
1
February 27th, 2012 05:00
and do not forget to reboot the datamover after changing the param (editing the param file)
KaushikP
66 Posts
0
February 27th, 2012 23:00
Checked that the value has changed to 64 KB yet it getting the same NDMP error:
[admin@XXXXXX ~]# server_param server_2 -facility PAX -info maxCifsBufferLengthInKB
server_2 :
name = maxCifsBufferLengthInKB
facility_name = PAX
default_value = 32
current_value = 64
configured_value = 64
user_action = none
change_effective = immediate
range = (8,128)
description = Maximum allowed cifs ea/sd buffer length for NDMP backup/restore in kilobytes
KaushikP
66 Posts
0
February 27th, 2012 23:00
Thanks Sameer and Peter for your information. I'd added the parameter using $ vi /nas/server/slot_x/param
param PAX maxCifsBufferLengthInKB=64
And rebooted the DM using command: server_cpu server_2 -reboot -monitor now
But the issue remain the same after DM reboot.
Error ndmpagent(pid=8604) NDMP_LOG_ERROR 0 Backup cifs sd length for /CIFS_Host/Share_Patha/Sub_Path too long 34698. The security descriptor size has been limited to 32KB for NDMP backups. Exceeding this limit may result in a Data Mover panic. Contact your Customer Support representative to check the cifs security descriptor, workaround, and refer to Primus emc134597.
Any guess? Should i do a cold reboot instead of default warm reboot?
Rainer_EMC
4 Operator
•
8.6K Posts
0
February 28th, 2012 09:00
Then it is time to open a service request
KaushikP
66 Posts
0
February 28th, 2012 23:00
Things got resolved after we gave a second try. Now the full backup of that CIFS host is successful. Thanks for that instant help and information. Things are resolved now!