02-26-2016 10:29 AM
I just configured Quantum DXi with OST, previously it was used as Basic Disk via NFS share.
I noticed significant a performance improvement in the backup speed/throughput, anywhere from 1.8 to 4.5 times faster than using NFS.
However, I have not been able to figure out how to look at the content of the OST diskpool, while w/ NFS it is kinda reassuring to be able to list the content of the share to see those backup images
Is there a way to check the content of OST pool aside from just doing "bpimmedia", which show mediaid something like @aaxxx? Can I do a listing of this media id within OST?
Also bpstsinfo -ii doesn't seem to list this backup to the OST disk pool? Is that normal?
Thanks!
02-26-2016 10:44 AM
The backup images are obfuscated by OST, behind a proprietary quasi file system of sorts.
The best way to re-assure yourself is to perform some restores.
Or, you could pick random image IDs from a bpimmedia (by pool ID) list and execute some bpverify commands, which will walk the image header - but I believe that bpverify does not walk the image fragments, I'm not 100% sure on that though - it might do.
One way to definitely walk the image fragments and the entire image content... might be to randomly pick images and script up a bpduplicate to basic disk, and then a bpexpdate (but be very careful of copy numbers here) of the copy on the Basic Disk STU, as this will definitely re-hydrate the backup and read back all de-duped fragments. i.e. an actual test of re-constituting the backup image, just a like an actual restore does.
.
In fact... this is such a good idea that I'm going to implement it. Automated backup readability testing of backups stored in de-dupe/OST. Like it. :) Cheers for the question!
02-26-2016 11:15 AM
Thanks for confirming. I asked uncle google, and he culdn't tell me much either.
So far the closest I get is to use nbdevquery -listmediaid, which is kinda verifying that the mediaid in question is inside the diskpool of the LSU in the OST.
# bpimmedia -policy mypolicy -U |grep -i mediaid|head -1
MediaID: @aaaal
# nbdevquery -listmediaid @aaaal -l
V_5_ QuantumDXi-OST Quantum _PhysicalLSU @aaaal 10809.49 8150.51 24 1 0 1 0 0 14 0
Thanks!