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Friday, January 08

Geek

New Server: Sakura

I have a new server, Sakura, to handle backups for the mununiverse.  It has 32TB of disk, arranged as two independent 8TB RAID-1 volumes.  The previous backup server (also named Sakura) had 6TB RAID-5, so 16TB RAID-1 is quite an upgrade.  And the new server is slightly cheaper.

Only downside is the new Sakura has shingles.  That is, it uses shingled disk drives, where the tracks actually overlap.  This works because drive read heads are smaller than write heads, and can accurately read the half-sized tracks.  But it means that you can't overwrite a single sector; you have to read a whole group of tracks, change the bits you want, and write the whole lot back.

Sequential performance is just fine - 160MB/sec on both reads and writes.  Random access is fine, even great, up to a point.  The drives have a 20GB buffer area for random writes, which works extremely well - several times faster than a normal disk drive.

But I can't recommend doing an OS update while a RAID rebuild is running.  That seems to be pushing things a bit too far.

Posted by: Pixy Misa at 03:44 PM | No Comments | Add Comment | Trackbacks (Suck)
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