emcopy - access time not getting copied

Question

I'm using EMCopy with /sdd flag to copy files from a Netapp volume to Isilon share and it is not copying the file "accessed" time value. The access time inherits the modified time values, create time is OK. Did anyone notice this issue. the "Access time tracking" is disabled on the cluster and I think this could be because of that. I had to use emcopy for this volume as there are issues with isi_vol_copy ( bugs) with 7.0.2.5 version. The isilon share has "run as root" privileges for the user and they are part of local administrator group on both arrays...so no issue there. Please let me know if you have faced this issue before and what resolved it

thanks in advance

-H

keo_emc · Accepted Answer

Access Time Tracking is for SmartPools policies not updating the access time on files.

Per your other post, there was a create time / birth time issue with isi_vol_copy in earlier versions of code and may be causing some of your troubles from your production cluster.

Check the release notes for 7.0.2.4 and 7.0.2.5.

russ_stevenson_ · Answer

Did you enable Access Time Tracking on the cluster? It is disabled by default but can be turned on easily.Enable it and try a recopy with emcopy.

Narahari1 · Answer

Enabled 'access time tracking' precision to 1 minute on the cluster but it still did not copy and update the access time of files on the Isilon. Robocopy also is not doing the access time stamp update to files on Isilon as on source files. The isi_vol_copy messes up the create date also let alone the access time. Does anyone had any success in copying access time of files to Isilon cluster ?

Narahari1 · Answer

Thanks for information on access time tracking. The file birth time issues is not recorded on 7.0.2.5 release notes and there are lot many other issues with isi_vol_copy command. Another disadvantage is it does not provide any count of number of folders/files it has copied. Has to rely on other tools to get accurate file and folder counts. Also it does not appear to be copying access time either. I'm still in search of a tool which can do the copy of file metadata correctly.

keo_emc · Answer

What was the exact problem with robocopy?

Narahari1 · Answer

Robocopy works fine except that it will not copy 'access' time of files and it is really slow even with Win2k8 /MT option. It is also not very good at copying special permission of files&folders especially if the sub folder NTFS permission is changed at the source.

keo_emc · Answer

That's really interesting as it's the first I've heard of that. I used robocopy in coordination with isivolcopy to move ~800TB for a customer last year.

I'm assuming you have run as root in play on the shares per the BP for SMB migrations?

ryanmulcahy · Answer

Customer stated 'I know how to view and enable atime on Windows and Isilon and it is enabled and set to 1 hour, the problem is when my end user migrates from VNX to Isilon using EMcopy, the access time does not stay synced and carry over. The access time on the Isilon reflects the last modified timestamp instead.' Ryan Mulcahy TSE

AdamFox · Answer

Check and see if the Isilon is set to track atime. I think by default it is not. Many use cases do not require atime tracking and so you get a performance boost by not tracking it (you save a metadata update on every read).

-- Adam Fox

Advisory SE, Emerging Technology Division

ryanmulcahy · Answer

I am also running into similar issue:

# emcopy64 source dest /purge /s /sdd /xd Folders /d /secforce /o /r:0 /c /log:.\log.txt /th XX

So I have file1 on VNX I want to migrate to Isilon, The atime shows on VNX say Sept 1st, the modified date shows Sept 20th. when I migrate file1 to Isilon and look at the atime, it shows Sept 20th instead of Sept 1st.

bellonia · Answer

@Narahari have you solved the problem with access time and creation time with emcopy? i have same problem, moreover emcopy is more performant then isi_vol_copy_vnx that has a lot of dark side.

Isilon

emcopy - access time not getting copied

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