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13514 discussions

Recovering a RAID 4 aggregate on FAS2020
by David Fernández 10 Apr '12

10 Apr '12

Hi all, This is in short our present (sad) toaster situation: we had a FAS2020 system with two controllers, a base shelf of 12 SAS 300Gb disks and an external shelf of 14 1TB SATA disks. We had, among others, an agreggate made of 6 SATA disks configured with RAID4 (5 data disks + 1 parity disk) and 1 spare disk available. One week ago, one of the disks failed. The system substituted it by the spare disk and begun to reconstruct the RAID. However 20 hours later and, before finishing RAID reconstruction, another disk failed. Reconstruction should have ended on that period as the system was not loaded at all (10-12 hours should have lasted as I've read), but unfortunately took longer. When the second disk failed, the first controller made a takeover and set the aggregate offline. After contacting Netapp support, they forced a giveback that led to the following situation: Aggregate aggr1 (failed, raid4, partial) (block checksums) Plex /aggr1/plex0 (offline, failed, inactive) RAID group /aggr1/plex0/rg0 (partial) RAID Disk Device HA SHELF BAY CHAN Pool Type RPM Used (MB/blks) Phys (MB/blks) --------- ------ ------------- ---- ---- ---- ----- -------------- -------------- parity 0a.22 0a 1 6 FC:A - ATA 7200 847555/1735794176 847827/1736350304 data 0a.16 0a 1 0 FC:A - ATA 7200 847555/1735794176 847827/1736350304 data FAILED N/A 847555/1735794176 data 0a.26 0a 1 10 FC:A - ATA 7200 847555/1735794176 847827/1736350304 data 0a.24 0a 1 8 FC:A - ATA 7200 847555/1735794176 847827/1736350304 data 0a.28 0a 1 12 FC:A - ATA 7200 847555/1735794176 847827/1736350304 (reconstruction 99% completed) Raid group is missing 1 disk. That is, of a RAID4 6 disks aggregrate we have 4 disks OK, one reconstructed at 99% (as message suggests) and a broken one. My question is: should we have any hope to recover the information or we should directly forgot and recover all from backups? To make things worst, the two disks that failed are apparently working (at least they are detected by the system; could have been a software problem), but an improper sequence of commands have partially 'zeroed' them. Any idea, comment or opinion is welcome. Thanks in advance, David

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nfs: cannot create regular file : Premission denied
by Koping Wang 09 Apr '12

09 Apr '12

Hi, I am a Unix administrator, new to Netapp. We have an IBM N6240 running data ontap 8.0.2p3. I created an nfs share on the netapp with rw and root access by an Ubuntu linux (10.4). I got a very weird permission issue. >From FilerView: /vol/napc2_p2_kk1 Read-Write Access (10.49.51.119) Root Access (10.49.51.119) Security (sys) On Ubuntu Linux: root@arsenal:~# df -k /kingkong/ Filesystem 1K-blocks Used Available Use% Mounted on red-str-napc2v49-p2:/vol/napc2_p2_kk1 8589934592 4266101440 4323833152 50% /kingkong root@arsenal:~# ls -ld /kingkong drwxrwxrwx 4 root root 4096 2012-04-09 10:15 /kingkong When I copy files, I got thses errors: root@arsenal:/data1# cp -r test1 /kingkong cp: cannot create regular file `/kingkong/test1/test2/afg/po_533107/po_533107_0000000/po_533107_nir_0000000.tfw': Permission denied cp: cannot create regular file `/kingkong/test1/test2/afg/po_533107/po_533107_0000000/po_533107_blu_0000000.tif': Permission denied .. .. "ls" shows me the file name have been created but data size is 0. root@arsenal:/data1# ls -l /kingkong/test1/test2/afg/po_533107/po_533107_0000000/ total 0 -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_aoi.dbf -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_aoi.prj -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_aoi.shp -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_aoi.shx -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_blu_0000000.hdr -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_blu_0000000_rpc.txt -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_blu_0000000.tfw -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_blu_0000000.tif -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_component.dbf -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_component.prj -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_component.shp -rwxrwxrwx 1 root root 0 2012-04-09 10:51 po_533107_component.shx If I do it again, no error. Everything looks fine after copy. root@arsenal:/data1# cp -r test1 /kingkong root@arsenal:/data1# ls -l /kingkong/test1/test2/afg/po_533107/po_533107_0000000/ total 390576 -rwxrwxrwx 1 root root 639 2012-04-09 10:58 po_533107_aoi.dbf -rwxrwxrwx 1 root root 143 2012-04-09 10:58 po_533107_aoi.prj -rwxrwxrwx 1 root root 236 2012-04-09 10:58 po_533107_aoi.shp -rwxrwxrwx 1 root root 108 2012-04-09 10:58 po_533107_aoi.shx -rwxrwxrwx 1 root root 445 2012-04-09 10:58 po_533107_blu_0000000.hdr -rwxrwxrwx 1 root root 3770 2012-04-09 10:57 po_533107_blu_0000000_rpc.txt -rwxrwxrwx 1 root root 74 2012-04-09 10:58 po_533107_blu_0000000.tfw -rwxrwxrwx 1 root root 19908262 2012-04-09 10:57 po_533107_blu_0000000.tif Can somebody help me to find out what is going wrong? Thanks Koping

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Interconnect ports on FAS3240 / N6240 (IBM)
by Ray Van Dolson 06 Apr '12

06 Apr '12

We have a FAS3240 (IBM N6240 actually) and are wanting to trunk in a network and give ourselevs a new vif on subnet 192.168.3.0/24 (as an example). However, we see that the interconnect interfaces (c0a/c0b) have an IP in this same range (192.168.3.x). It seems as those these are internal only, and as such I'm guessing if we add a vif for serving data in the same subnet, there won't be any conflicts? Can anyone confirm? Thanks, Ray

2 3

References for KRB5 and MS AD as KDC.
by robert.a.clark＠daimler.com 05 Apr '12

05 Apr '12

Howdy Toasters, I'm looking for docs on how to setup KRB5 and NFS V4, with a MS AD as KDC. I've looked through TR-3580 as well as some of Eisler's blog entries. Is there a canonical reference for this stuff? Most of the material I've found so far is a bit scattered, and several years old. My test filer is a FAS270 running 7.3.6P5. Thanks, [RC] If you are not the intended addressee, please inform us immediately that you have received this e-mail in error, and delete it. We thank you for your cooperation.

1 0

Compression. What's real and what they trumpet
by Milazzo Giacomo 05 Apr '12

05 Apr '12

Hi all, since a lot of time but more over during past events NetApp shouts it from the rooftops that "data compression" in 8.x is a reality! Fake. Yet today a PVR is requested to activate the compression on 8.0.x (the most of "8" installations are on this release) and 8.1 is currently in RC...again, 8.1 has several bugs to be fixed in 8.1.1 (when?) that interest 3100 series (lot of systems running on this platform). Me, and most of my collegues, don't trust in compression. Yes, we can test it, we can do some trick but to upgrade a perfectly running system just to compress some data is another play. The issue is that customers attending those events want to compress data and ask us to set up the systems. What's your opinions about this feature? We've experienced several troubles in a production environment. I still consider that compression is not a mature feature how could be, for instance, deduplication or all the techniques to implement the so named storage efficiency. Regards Dott. Giacomo Milazzo [Descrizione: cid:image001.jpg@01C75422.0D316270] Technical Account Manager Sinergy SpA Filiale di Roma * 00198. viale Regina Margherita, 269 ' (+39) 3406001045 0644245272 7 (+39) 0226922048 * Giacomo.Milazzo(a)Sinergy.it

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Do I need a flexclone license?
by Milazzo Giacomo 05 Apr '12

05 Apr '12

Hi all, I ask this to field for I'm receiving not always clear answers. The environment is this: Oracle RAC and ASM with backups managed by SMO in SAN FC storage. If I would mount a snap to have a rewritable image do I need the FlexClone license too? If I would clone a snap do I need FlexClone? Regards

4 3

fpolicy overhead
by Kennedy, Jeffrey 05 Apr '12

05 Apr '12

Does anyone know what the overhead of fpolicy translates into? Specifically I'm looking at NTP QFS for external quota management (no file blocking). Right now I can't test under load, just functional (minimal lab environment) but I'd like some idea of overhead before going too far down the path. For instance, if having fpolicy enabled for such a function will add 20%, I may as well stop now. But if it's 2% then everything's rosy. As an aside, I'm also looking at the security audit and reporting product from Likewise, now EMC-Isilon. It also uses fpolicy and cifs auditing. I do not yet have this in the lab but any input on this would also be appreciated. Thanks. Jeff Kennedy Qualcomm, Incorporated QCT Engineering Compute 858-651-6592

2 2

V-series / WAFL performance / 20% free
by Stuart Kendrick 04 Apr '12

04 Apr '12

Hi folks, I'm familiar with the NetApp recommendation to keep ~20% free on all volumes ... this allows WAFL to maximize its performance (convert random IO to streaming IO ... i.e. the 'Write Anywhere ...' part of WAFL). But I'm skeptical that this recommendation applies to V-Series installations, i.e. situations in which the backend array was built by someone other than NetApp. Seems to me that with V-Series, WAFL may find what it thinks are 128K of contiguous blocks on storage and perform the WRITE ... but ... since the backend array has virtualized the blocks in some fashion, opaque to ONTAP, there is no knowing what really happens. In other words, the blocks which ONTAP specifies do /not/ map to physical blocks ... once the WRITE arrives at the array, the backend will do whatever it thinks best with them, perhaps perform a streaming write to contiguous blocks, perhaps not. Implementation-specific. -In fact, with a V-Series, I would imagine (I have a rich imagination) that ONTAP doesn't bother to even try to convert random IO into streaming IO -- I would imagine that it just hands the blocks to the backend in a jumble and says "Do whatever". So, I would like to claim that with V-Series, I can fill up my volumes without impacting write performance ... or, more precisely, that impact is dependent on the characteristics of the backend ... perhaps the backend needs free space in order to optimize its write performance, perhaps it does not. [In our particular case, we're using 3Par, and 'fullness' would not impact performance.] Would anyone see holes in my thinking? --sk Stuart Kendrick FHCRC

2 2

Operations Manager / Backup Manager.
by Jeff Cleverley 31 Mar '12

31 Mar '12

Greetings, We have a 3.8 version of OM/DFM that has been managing backups from multiple sites to a NearStore. We just moved the shelves to a different NearStore yesterday due to disk count limitations. Everything went well except OM will not recognize the new destination for the relationships. A snapvault status on the secondary shows all the relationships and the aggregates and volumes are online. We did a snapvault start -S of the relationships, a snapvault update, and also a snapvault release on the primaries. The primaries all show the correct relationships. OM can see the new destination filer and all the volumes, so it has access. It has also figured out the original NearStore volumes and relationships are not there because it removed them, and also emptied the schedules of any backup relationships. We tried a "Add new backup" which seemed to have worked except it did an Initialize of the relationship according to the snapmirror log file and seems to have done a baseline. We cannot re-baseline all of these relationships. Does anyone know how to get these relationships into OM without having to do a new baseline? Thanks, Jeff -- Jeff Cleverley Unix Systems Administrator 4380 Ziegler Road Fort Collins, Colorado 80525 970-288-4611

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Oracle (RHEL 5.7) on NFS (Ontap 8.1RC2) - complains of write
by Fletcher Cocquyt 30 Mar '12

30 Mar '12

Hi, I'm not seeing write performance issues on the OS (throughput tests on the command line are > 100Mb/sec) But Oracle is complaining about long commit times for the Netapp NFS mount with the following options: rw,noatime,bg,hard,nointr,tcp,nfsvers=3,timeo=600,rsize=32768,wsize=32768 (matches what I see in Oracle and Netapp docs) I'm working with the DBA to see if the Oracle tuning is optimal, but thought I'd poll this list for any nuggets of tuning Oracle on Netapp NFS And the disk busy on this aggregate is only 10% - and the CPU reads 40-50% thanks! Fletcher

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